# Extensions Used in Finnish PHR Profiles
FHIR specification requires that extensions are defined in structure definitions. PHR uses simple data type profiles as extensions. Extension elements in using profile has a descriptive name.

**Finnish PHR Application Information extension**: extension specifies information about the application that created the resource instance 

**Finnish PHR boolean extension**: extension specifies the structure to be used in boolean type extension element in profiles

**Finnish PHR UnsignedInt**: extension specifies the structure to be used in unsignedInt type extension element in profiles. 

**Finnish PHR Medication context**: extension specifies codeableConcept type, telling is the measurement done before or after the use of medication, or the medication is not used

**Finnish PHR PQTranslation extension**: specifies an alternative representation of the same physical quantity expressed in a different unit from a different unit code system and possibly with a different value