<Observation xmlns="http://hl7.org/fhir"><id value="bmi"/><meta><profile value="http://hl7.org/fhir/StructureDefinition/vitalsigns"/></meta><status value="final"/><category><coding><system value="http://terminology.hl7.org/CodeSystem/observation-category"/><code value="vital-signs"/><display value="Vital Signs"/></coding><text value="Vital Signs"/></category><code><coding><system value="http://loinc.org"/><code value="39156-5"/><display value="Body mass index (BMI) [Ratio]"/></coding><text value="BMI"/></code><subject><reference value="Patient/example"/></subject><effectiveDateTime value="1999-07-02"/><valueQuantity><value value="16.2"/><unit value="kg/m2"/><system value="http://unitsofmeasure.org"/><code value="kg/m2"/></valueQuantity></Observation>