FQL is a query language that allows you to retrieve, filter and project data from any data source containing FHIR Resources. It brings the power of three existing languages together: SQL, JSON and FhirPath. It allows you to create tables and is useful for gaining insight and perform quality control.
Query
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Default
What is FQL?
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FQL Query resources
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- FQL Documentation
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FQL Language
Syntax specification
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API
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Project FHIR API
This is the location where you can find your resource using a FHIR client.
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Simplifier FHIR API
The global endpoint is where users can search for all resources in Simplifier. Resources have a globally unique guid Id here.
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Organization HL7 International /
Project hl7.fhir.r3
Example Lipid Profile
LDL Cholesterol Result
- type Profile on Observation
- FHIR STU3
- status Draft
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versionnone
Unregistered conflicting canonical
The canonical from this resource does not match any claim in this context and conflicts with a claim from another scope.
http://hl7.org/fhir
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Canonical
| Example Lipid Profile (Observation) | I | Observation | Element idObservation LDL Cholesterol Result Alternate namesVital Signs, Measurement, Results, Tests DefinitionGroup of elements for LDL Cholesterol result. Used for simple observations such as device measurements, laboratory atomic results, vital signs, height, weight, smoking status, comments, etc. Other resources are used to provide context for observations such as lab reports, etc.
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| id | Σ | 0..1 | id | There are no (further) constraints on this element Element idObservation.id Logical id of this artifact DefinitionThe logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes. The only time that a resource does not have an id is when it is being submitted to the server using a create operation. |
| meta | Σ | 0..1 | Meta | There are no (further) constraints on this element Element idObservation.meta Metadata about the resource DefinitionThe metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content may not always be associated with version changes to the resource. |
| implicitRules | Σ ?! | 0..1 | uri | There are no (further) constraints on this element Element idObservation.implicitRules A set of rules under which this content was created DefinitionA reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. This element is labelled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation. |
| language | 0..1 | codeBinding | There are no (further) constraints on this element Element idObservation.language Language of the resource content DefinitionThe base language in which the resource is written. Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute). A human language. Common Languages (extensible) | |
| text | I | 0..1 | Narrative | There are no (further) constraints on this element Element idObservation.text Text summary of the resource, for human interpretation Alternate namesnarrative, html, xhtml, display DefinitionA human-readable narrative that contains a summary of the resource, and may be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety. Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded in formation is added later.
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| contained | 0..* | Resource | There are no (further) constraints on this element Element idObservation.contained Contained, inline Resources Alternate namesinline resources, anonymous resources, contained resources DefinitionThese resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope. This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again.
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| extension | 0..* | Extension | There are no (further) constraints on this element Element idObservation.extension Additional Content defined by implementations Alternate namesextensions, user content DefinitionMay be used to represent additional information that is not part of the basic definition of the resource. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
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| modifierExtension | ?! | 0..* | Extension | There are no (further) constraints on this element Element idObservation.modifierExtension Extensions that cannot be ignored Alternate namesextensions, user content DefinitionMay be used to represent additional information that is not part of the basic definition of the resource, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
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| identifier | Σ | 0..* | Identifier | There are no (further) constraints on this element Element idObservation.identifier Business Identifier for observation DefinitionA unique identifier assigned to this observation. Allows observations to be distinguished and referenced.
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| basedOn | Σ | 0..* | Reference(CarePlan | DeviceRequest | ImmunizationRecommendation | MedicationRequest | NutritionOrder | ProcedureRequest | ReferralRequest) | There are no (further) constraints on this element Element idObservation.basedOn Fulfills plan, proposal or order Alternate namesFulfills DefinitionA plan, proposal or order that is fulfilled in whole or in part by this event. Allows tracing of authorization for the event and tracking whether proposals/recommendations were acted upon. Reference(CarePlan | DeviceRequest | ImmunizationRecommendation | MedicationRequest | NutritionOrder | ProcedureRequest | ReferralRequest) Mappings
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| status | Σ ?! | 1..1 | codeBinding | There are no (further) constraints on this element Element idObservation.status registered | preliminary | final | amended + DefinitionThe status of the result value. Need to track the status of individual results. Some results are finalized before the whole report is finalized. This element is labeled as a modifier because the status contains codes that mark the resource as not currently valid. Codes providing the status of an observation. ObservationStatus (required)Mappings
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| category | 0..* | CodeableConceptBinding | There are no (further) constraints on this element Element idObservation.category Classification of type of observation DefinitionA code that classifies the general type of observation being made. Used for filtering what observations are retrieved and displayed. In addition to the required category valueset, this element allows various categorization schemes based on the owner’s definition of the category and effectively multiple categories can be used at once. The level of granularity is defined by the category concepts in the value set. Codes for high level observation categories. Observation Category Codes (preferred)Mappings
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| code | S Σ | 1..1 | CodeableConceptBinding | Element idObservation.code LDL Cholesterol -measured or calculated per code Alternate namesName DefinitionLDL Cholesterol -measured or calculated per code. Knowing what kind of observation is being made is essential to understanding the observation. LDL Cholesterol codes - measured or calculated LDLCodes (required)Mappings
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| subject | Σ | 0..1 | Reference(Patient | Group | Device | Location) | There are no (further) constraints on this element Element idObservation.subject Who and/or what this is about DefinitionThe patient, or group of patients, location, or device whose characteristics (direct or indirect) are described by the observation and into whose record the observation is placed. Comments: Indirect characteristics may be those of a specimen, fetus, donor, other observer (for example a relative or EMT), or any observation made about the subject. Observations have no value if you don't know who or what they're about. One would expect this element to be a cardinality of 1..1. The only circumstance in which the subject can be missing is when the observation is made by a device that does not know the patient. In this case, the observation SHALL be matched to a patient through some context/channel matching technique, and at this point, the observation should be updated. If the target of the observation is different than the subject, the general extension observation-focal-subject. may be used. However, the distinction between the patient's own value for an observation versus that of the fetus, or the donor or blood product unit, etc., are often specified in the observation code. Reference(Patient | Group | Device | Location) Mappings
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| context | 0..1 | Reference(Encounter | EpisodeOfCare) | There are no (further) constraints on this element Element idObservation.context Healthcare event during which this observation is made Alternate namesEncounter DefinitionThe healthcare event (e.g. a patient and healthcare provider interaction) during which this observation is made. For some observations it may be important to know the link between an observation and a particular encounter. This will typically be the encounter the event occurred within, but some events may be initiated prior to or after the official completion of an encounter or episode but still be tied to the context of the encounter or episode (e.g. pre-admission lab tests). Reference(Encounter | EpisodeOfCare) Mappings
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| effective[x] | Σ | 0..1 | There are no (further) constraints on this element Element idObservation.effective[x] Clinically relevant time/time-period for observation Alternate namesOccurrence DefinitionThe time or time-period the observed value is asserted as being true. For biological subjects - e.g. human patients - this is usually called the "physiologically relevant time". This is usually either the time of the procedure or of specimen collection, but very often the source of the date/time is not known, only the date/time itself. Knowing when an observation was deemed true is important to its relevance as well as determining trends. At least a date should be present unless this observation is a historical report.
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| effectiveDateTime | dateTime | There are no (further) constraints on this element Data type | ||
| effectivePeriod | Period | There are no (further) constraints on this element Data type | ||
| issued | Σ | 0..1 | instant | There are no (further) constraints on this element Element idObservation.issued Date/Time this was made available DefinitionThe date and time this observation was made available to providers, typically after the results have been reviewed and verified. Updated when the result is updated.
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| performer | Σ | 0..* | Reference(Practitioner | Organization | Patient | RelatedPerson) | There are no (further) constraints on this element Element idObservation.performer Who is responsible for the observation DefinitionWho was responsible for asserting the observed value as "true". May give a degree of confidence in the observation and also indicates where follow-up questions should be directed. Reference(Practitioner | Organization | Patient | RelatedPerson) Mappings
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| valueQuantity | S Σ I | 0..1 | Quantity | Element idObservation.valueQuantity LDL Cholesterol value DefinitionLDL Cholesterol value. If a result is not available, use the comments field. An observation exists to have a value, though it may not if it is in error, or if it represents a group of observations. Normally, an observation will have either a single value or a set of related observations. A few observations (e.g. Apgar score) may have both a value and related observations (for an Apgar score, the observations from which the measure is derived). If a value is present, the datatype for this element should be determined by Observation.code. This element has a variable name depending on the type as follows: valueQuantity, valueCodeableConcept, valueString, valueBoolean, valueRange, valueRatio, valueSampledData, valueAttachment, valueTime, valueDateTime, or valuePeriod. (The name format is "'value' + the type name" with a capital on the first letter of the type). If the data element is usually coded or if the type associated with the Observation.value defines a coded value, use CodeableConcept instead of string datatype even if the value is uncoded text. A value set is bound to the ValueCodeableConcept element. For further discussion and examples see the notes section below.
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| dataAbsentReason | I | 0..1 | CodeableConceptBinding | There are no (further) constraints on this element Element idObservation.dataAbsentReason Why the result is missing DefinitionProvides a reason why the expected value in the element Observation.value[x] is missing. For many results it is necessary to handle exceptional values in measurements. Null or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "specimen unsatisfactory". The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Note that an observation may only be reported if there are values to report. For example differential cell counts values may be reported only when > 0. Because of these options, use-case agreements are required to interpret general observations for null or exceptional values. Codes specifying why the result (Observation.value[x]) is missing. Observation Value Absent Reason (extensible)Mappings
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| interpretation | S | 0..1 | CodeableConceptBinding | Element idObservation.interpretation + | ++ | +++ | - | -- | --- Alternate namesAbnormal Flag Definition
For some results, particularly numeric results, an interpretation is necessary to fully understand the significance of a result. Codes identifying interpretations of observations. Observation Interpretation Codes (extensible)Mappings
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| comment | S | 0..1 | string | Element idObservation.comment Comments about result DefinitionComments about result. Need to be able to provide free text additional information.
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| bodySite | 0..1 | CodeableConcept | There are no (further) constraints on this element Element idObservation.bodySite Observed body part DefinitionIndicates the site on the subject's body where the observation was made (i.e. the target site). Only used if not implicit in code found in Observation.code. In many systems, this may be represented as a related observation instead of an inline component. If the use case requires BodySite to be handled as a separate resource (e.g. to identify and track separately) then use the standard extension body-site-instance. Codes describing anatomical locations. May include laterality. SNOMED CT Body Structures (example)Mappings
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| method | 0..1 | CodeableConcept | There are no (further) constraints on this element Element idObservation.method How it was done DefinitionIndicates the mechanism used to perform the observation. In some cases, method can impact results and is thus used for determining whether results can be compared or determining significance of results. Only used if not implicit in code for Observation.code. Methods for simple observations. Observation Methods (example)Mappings
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| specimen | 0..1 | Reference(Specimen) | There are no (further) constraints on this element Element idObservation.specimen Specimen used for this observation DefinitionThe specimen that was used when this observation was made. Should only be used if not implicit in code found in
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| device | 0..1 | Reference(Device | DeviceMetric) | There are no (further) constraints on this element Element idObservation.device (Measurement) Device DefinitionThe device used to generate the observation data. An extension should be used if further typing of the device is needed. Devices used to support obtaining an observation can be represented using either an extension or through the Observation.related element. Reference(Device | DeviceMetric) Mappings
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| referenceRange | S I | 1..1 | BackboneElement | There are no (further) constraints on this element Element idObservation.referenceRange Provides guide for interpretation DefinitionGuidance on how to interpret the value by comparison to a normal or recommended range. Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts. Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this may not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.
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| id | 0..1 | string | There are no (further) constraints on this element Element idObservation.referenceRange.id xml:id (or equivalent in JSON) Definitionunique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
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| extension | 0..* | Extension | There are no (further) constraints on this element Element idObservation.referenceRange.extension Additional Content defined by implementations Alternate namesextensions, user content DefinitionMay be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
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| modifierExtension | Σ ?! | 0..* | Extension | There are no (further) constraints on this element Element idObservation.referenceRange.modifierExtension Extensions that cannot be ignored Alternate namesextensions, user content, modifiers DefinitionMay be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
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| low | I | 0..0 | SimpleQuantity | There are no (further) constraints on this element Element idObservation.referenceRange.low Low Range, if relevant DefinitionThe value of the low bound of the reference range. The low bound of the reference range endpoint is inclusive of the value (e.g. reference range is >=5 - <=9). If the low bound is omitted, it is assumed to be meaningless (e.g. reference range is <=2.3).
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| high | I | 1..1 | SimpleQuantityFixed Value | Element idObservation.referenceRange.high High Range, if relevant Definition<3.0 mmol/L. Per Australian NHF Recommendations. {
"value": 3.0
}
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| type | 0..0 | CodeableConceptBinding | There are no (further) constraints on this element Element idObservation.referenceRange.type Reference range qualifier DefinitionCodes to indicate the what part of the targeted reference population it applies to. For example, the normal or therapeutic range. Need to be able to say what kind of reference range this is - normal, recommended, therapeutic, etc, - for proper interpretation. This SHOULD be populated if there is more than one range. If this element is not present then the normal range is assumed. Code for the meaning of a reference range. Observation Reference Range Meaning Codes (extensible)Mappings
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| appliesTo | 0..0 | CodeableConcept | There are no (further) constraints on this element Element idObservation.referenceRange.appliesTo Reference range population DefinitionCodes to indicate the target population this reference range applies to. For example, a reference range may be based on the normal population or a particular sex or race. Need to be able to identify the target population for proper interpretation. This SHOULD be populated if there is more than one range. If this element is not present then the normal population is assumed. Codes identifying the population the reference range applies to. Observation Reference Range Applies To Codes (example)Mappings
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| age | 0..0 | Range | There are no (further) constraints on this element Element idObservation.referenceRange.age Applicable age range, if relevant DefinitionThe age at which this reference range is applicable. This is a neonatal age (e.g. number of weeks at term) if the meaning says so. Some analytes vary greatly over age.
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| text | 0..1 | string | There are no (further) constraints on this element Element idObservation.referenceRange.text Text based reference range in an observation DefinitionText based reference range in an observation which may be used when a quantitative range is not appropriate for an observation. An example would be a reference value of "Negative" or a list or table of 'normals'.
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| related | Σ | 0..0 | BackboneElement | There are no (further) constraints on this element Element idObservation.related Resource related to this observation DefinitionA reference to another resource (usually another Observation) whose relationship is defined by the relationship type code. Normally, an observation will have either a value or a set of related observations. A few observations (e.g. Apgar score) may have both a value and a set of related observations or sometimes a QuestionnaireResponse from which the measure is derived. For a discussion on the ways Observations can assembled in groups together see Notes below.
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| component | Σ | 0..* | BackboneElement | There are no (further) constraints on this element Element idObservation.component Component results DefinitionSome observations have multiple component observations. These component observations are expressed as separate code value pairs that share the same attributes. Examples include systolic and diastolic component observations for blood pressure measurement and multiple component observations for genetics observations. Component observations share the same attributes in the Observation resource as the primary observation and are always treated a part of a single observation (they are not separable). However, the reference range for the primary observation value is not inherited by the component values and is required when appropriate for each component observation. For a discussion on the ways Observations can be assembled in groups together see Notes below.
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| id | 0..1 | string | There are no (further) constraints on this element Element idObservation.component.id xml:id (or equivalent in JSON) Definitionunique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.
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| extension | 0..* | Extension | There are no (further) constraints on this element Element idObservation.component.extension Additional Content defined by implementations Alternate namesextensions, user content DefinitionMay be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
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| modifierExtension | Σ ?! | 0..* | Extension | There are no (further) constraints on this element Element idObservation.component.modifierExtension Extensions that cannot be ignored Alternate namesextensions, user content, modifiers DefinitionMay be used to represent additional information that is not part of the basic definition of the element, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.
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| code | Σ | 1..1 | CodeableConcept | There are no (further) constraints on this element Element idObservation.component.code Type of component observation (code / type) DefinitionDescribes what was observed. Sometimes this is called the observation "code". Knowing what kind of observation is being made is essential to understanding the observation. Codes identifying names of simple observations. LOINC Codes (example)Mappings
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| value[x] | Σ | 0..1 | There are no (further) constraints on this element Element idObservation.component.value[x] Actual component result DefinitionThe information determined as a result of making the observation, if the information has a simple value. An observation exists to have a value, though it may not if it is in error, or if it represents a group of observations. Normally, an observation will have either a single value or a set of related observations. A few observations (e.g. Apgar score) may have both a value and related observations (for an Apgar score, the observations from which the measure is derived). If a value is present, the datatype for this element should be determined by Observation.code. A CodeableConcept with just a text would be used instead of a string if the field was usually coded, or if the type associated with the Observation.code defines a coded value. For boolean values use valueCodeableConcept and select codes from http://hl7.org/fhir/ValueSet/v2-0136 (these "yes/no" concepts can be mapped to the display name "true/false" or other mutually exclusive terms that may be needed"). The element, Observation.value[x], has a variable name depending on the type as follows: valueQuantity, valueCodeableConcept, valueRatio, valueChoice, valuePeriod, valueSampleData, or valueString (the name format is "'value' + the type name" with a capital on the first letter of the type).
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| valueQuantity | Quantity | There are no (further) constraints on this element Data type | ||
| valueCodeableConcept | CodeableConcept | There are no (further) constraints on this element Data type | ||
| valueString | string | There are no (further) constraints on this element Data type | ||
| valueRange | Range | There are no (further) constraints on this element Data type | ||
| valueRatio | Ratio | There are no (further) constraints on this element Data type | ||
| valueSampledData | SampledData | There are no (further) constraints on this element Data type | ||
| valueAttachment | Attachment | There are no (further) constraints on this element Data type | ||
| valueTime | time | There are no (further) constraints on this element Data type | ||
| valueDateTime | dateTime | There are no (further) constraints on this element Data type | ||
| valuePeriod | Period | There are no (further) constraints on this element Data type | ||
| dataAbsentReason | I | 0..1 | CodeableConceptBinding | There are no (further) constraints on this element Element idObservation.component.dataAbsentReason Why the component result is missing DefinitionProvides a reason why the expected value in the element Observation.value[x] is missing. For many results it is necessary to handle exceptional values in measurements. "Null" or exceptional values can be represented two ways in FHIR Observations. One way is to simply include them in the value set and represent the exceptions in the value. For example, measurement values for a serology test could be "detected", "not detected", "inconclusive", or "test not done". The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values. For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Because of these options, use-case agreements are required to interpret general observations for exceptional values. Codes specifying why the result (Observation.value[x]) is missing. Observation Value Absent Reason (extensible)Mappings
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| interpretation | 0..1 | CodeableConceptBinding | There are no (further) constraints on this element Element idObservation.component.interpretation High, low, normal, etc. Alternate namesAbnormal Flag DefinitionThe assessment made based on the result of the observation. Intended as a simple compact code often placed adjacent to the result value in reports and flow sheets to signal the meaning/normalcy status of the result. Otherwise known as abnormal flag. For some results, particularly numeric results, an interpretation is necessary to fully understand the significance of a result. The component interpretation applies only to the individual component value. For an overall interpretation all components together use thes Observation.interpretation element. Codes identifying interpretations of observations. Observation Interpretation Codes (extensible)Mappings
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| referenceRange | 0..* | see (referenceRange) | There are no (further) constraints on this element Element idObservation.component.referenceRange Provides guide for interpretation of component result DefinitionGuidance on how to interpret the value by comparison to a normal or recommended range. Knowing what values are considered "normal" can help evaluate the significance of a particular result. Need to be able to provide multiple reference ranges for different contexts. Most observations only have one generic reference range. Systems MAY choose to restrict to only supplying the relevant reference range based on knowledge about the patient (e.g., specific to the patient's age, gender, weight and other factors), but this may not be possible or appropriate. Whenever more than one reference range is supplied, the differences between them SHOULD be provided in the reference range and/or age properties.
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