See the patterns page for implementation and usage patterns.

Note: US-Core define precise profiles for specific observations. QI-Core inherits these specific profiles directly. When creating expressions for eCQMs or CDS artifacts with QI-Core for the following clinical data, use the applicable profile directly rather than the generic Observation resource:

• FHIR Vital Signs Profile
• Pediatric-BMI-for Age
• Pediatric Head Occipital-frontal Circumference Percentile
• Pediatric Weight for Height
• Pulse Oximetry
• Smoking Status

To create an expression specifically requesting information that an observation intentionally did not occur for a medical, patient or system reason, use the profile QICore-observationnotdone.

define "Pap Test with Results":
	[Observation: "Pap Test"] PapTest
		where PapTest.value is not null
			and PapTest.status in { 'final', 'amended', 'corrected', 'preliminary' }