PrescribeIT® Specification and Guide Version 5.0

A cost in dollars for a single unit of a particular drug or other prescribable product

The context of use may frequently define what kind of quantity this is and therefore what kind of units can be used. The context of use may also restrict the values for the comparator.

unique id for the element within a resource (for internal references).

May 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.

The value of the measured amount. The value includes an implicit precision in the presentation of the value.

Precision is handled implicitly in almost all cases of measurement.

This will always be expressed in dollars/unit, even if the value is fraction of a sent. E.g. 0.0023

Not allowed to be used in this context

Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology.

This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value.

A human-readable form of the unit.

There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms.

This should be expressed as $/tablet, $/mL, $/mg, etc.

The identification of the system that provides the coded form of the unit.

Need to know the system that defines the coded form of the unit.

This will generally be UCUM.

A computer processable form of the unit in some unit representation system.

Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest.

If expressed as UCUM, this will be expressed as 1/mL, 1/mg, etc. The fact that the numerator is a dollar amount or the form of the drug will not be conveyed (though it will in the human-readable representation)