Dose syntax implementation guidance for FHIR STU3

This guidance is under active development by NHS Digital and content may be added or updated on a regular basis.

Aspirin 300mg dispersible tablets, two tablets to be taken four times daily well diluted in water. To be taken with food.

Product-based prescription using additional instruction field to convey dosing instructions.
<MedicationRequest xmlns="http://hl7.org/fhir">
<id value="a8ca980c-72aa-11e7-8cf7-a6006ad3dba0" />
<contained>
<Medication>
<id value="med1" />
<code>
<coding>
<system value="http://snomed.info/sct" />
<code value="329526003" />
<display value="Aspirin 300mg dispersible tablets" />
</coding>
</code>
</Medication>
</contained>
<status value="active" />
<intent value="order" />
<medicationReference>
<reference value="#med1" />
</medicationReference>
<subject>
<identifier>
<system value="https://fhir.nhs.uk/Id/nhs-number" />
<value value="9999999999" />
</identifier>
</subject>
<dosageInstruction>
<additionalInstruction>
<coding>
<system value="http://snomed.info/sct" />
<code value="417995008" />
<display value="Dissolve or mix with water before taking" />
</coding>
</additionalInstruction>
<timing>
<repeat>
<frequency value="4" />
<period value="1" />
<periodUnit value="d" />
<when value="C" />
<when value="PC" />
</repeat>
</timing>
<doseQuantity>
<value value="2" />
<unit value="tablet" />
<system value="http://snomed.info/sct" />
<code value="428673006" />
</doseQuantity>
</dosageInstruction>
</MedicationRequest>
{
"resourceType": "MedicationRequest",
"id": "a8ca980c-72aa-11e7-8cf7-a6006ad3dba0",
"contained": [
{
"resourceType": "Medication",
"id": "med1",
"code": {
"coding": [
{
"system": "http://snomed.info/sct",
"code": "329526003",
"display": "Aspirin 300mg dispersible tablets"
}
]
}
}
],
"status": "active",
"intent": "order",
"medicationReference": {
"reference": "#med1"
},
"subject": {
"identifier": {
"system": "https://fhir.nhs.uk/Id/nhs-number",
"value": "9999999999"
}
},
"dosageInstruction": [
{
"additionalInstruction": [
{
"coding": [
{
"system": "http://snomed.info/sct",
"code": "417995008",
"display": "Dissolve or mix with water before taking"
}
]
}
],
"timing": {
"repeat": {
"frequency": 4,
"period": 1,
"periodUnit": "d",
"when": [
"C",
"PC"
]
}
},
"doseQuantity": {
"value": 2,
"unit": "tablet",
"system": "http://snomed.info/sct",
"code": "428673006"
}
}
]
}
MedicationRequest.id[0]a8ca980c-72aa-11e7-8cf7-a6006ad3dba0
MedicationRequest.contained[0].id[0]med1
MedicationRequest.contained[0].code[0].coding[0].system[0]http://snomed.info/sct
MedicationRequest.contained[0].code[0].coding[0].code[0]329526003
MedicationRequest.contained[0].code[0].coding[0].display[0]Aspirin 300mg dispersible tablets
MedicationRequest.status[0]active
MedicationRequest.intent[0]order
MedicationRequest.medication[0].reference[0]#med1
MedicationRequest.subject[0].identifier[0].system[0]https://fhir.nhs.uk/Id/nhs-number
MedicationRequest.subject[0].identifier[0].value[0]9999999999
MedicationRequest.dosageInstruction[0].additionalInstruction[0].coding[0].system[0]http://snomed.info/sct
MedicationRequest.dosageInstruction[0].additionalInstruction[0].coding[0].code[0]417995008
MedicationRequest.dosageInstruction[0].additionalInstruction[0].coding[0].display[0]Dissolve or mix with water before taking
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].frequency[0]4
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].period[0]1
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].periodUnit[0]d
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].when[0]C
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].when[1]PC
MedicationRequest.dosageInstruction[0].dose[0].value[0]2
MedicationRequest.dosageInstruction[0].dose[0].unit[0]tablet
MedicationRequest.dosageInstruction[0].dose[0].system[0]http://snomed.info/sct
MedicationRequest.dosageInstruction[0].dose[0].code[0]428673006
MedicationRequest
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