ISO 21549-7:2007 describes and defines the medication data objects used within or referenced by patient held health data cards using UML, plain text and Abstract Syntax Notation (ASN.1).

ISO 21549-7:2007 is applicable to situations in which such data are recorded on or transported by patient healthcards compliant with the physical dimensions of ID-1 cards defined by ISO 7810.

ISO 21549-7:2007 specifies the basic structure of the data contained within the medication data object, but does not specify or mandate particular data-sets for storage on devices.

The purpose of ISO 21549-7:2007 is for cards to provide information to other health professionals and to the patient or its non-professional care giver.

It may also be used to carry a new prescription from the prescriber to the dispenser/pharmacy in the design of its sets.