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Here is some GELLO code to calculate BMI:

 imports HL7_v2_VMR_V1

 Context SinglePatient

 Let allWeights:Sequence(Observation) = vitals.weight

 Let allHeights:Sequence(Observation) = vitals.height

 Let mostRecentWeight:Observation = allWeights->sortedBy(dateTime)->last()

 Let mostRecentHeight:Observation = allHeights->sortedBy(dateTime)->last()

 Let wt:Real 

= mostRecentWeight.value.oclAsType(PQ).value

 Let ht:Real = mostRecentHeight.value.oclAsType(PQ).convert('m').value

 Let BMI: Real = wt/ht.power(2)

 If BMI < 18.5 then 'Underweight'

 else If BMI >= 18.5 and BMI < 25 then 'Normal'

 else If BMI >= 25 and BMI < 30 then 'Overweight'

 else 'Obese'

 endif

 endif

 endif 

Using fifthTest.xml, here is the result:

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