<Observation xmlns="http://hl7.org/fhir"><id value="bmi-using-related"/><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><category><coding><system value="http://loinc.org"/><code value="39156-5"/><display value="Body mass index (BMI) [Ratio]"/></coding></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><derivedFrom><reference value="Observation/bodyheight"/><display value="Body Height"/></derivedFrom><derivedFrom><reference value="Observation/example"/><display value="Body Weight"/></derivedFrom></Observation>