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. 2020 Mar 4;2019:1207–1215.

Table 1.

Most frequently co-occurring FHIR resource and answer types along with their corresponding counts. Q – Question, LF – Logical Form. Concepts in the questions are underlined.

Resource type Answer type Frequency Example
Observation Value 92 Q: What is his t-score?
LF: latest(λx.has_concept(x, C1526354))
Observation Max/Min 60 Q: What was the highest hemoglobin A1c value in the past 2 years?
LF: max(λx.has_concept(x, C0366781) ^ time_within(x, ‘past 2 years’))
Observation Is state 59 Q: Has her calcium level ever been less than 9 mg/dl?
LF: delta(λx.has_concept(x, C1977516) ^ less_than(x, ‘9 mg/dl’))
Condition Is state 54 Q: Was her ankle sprain healed?
LF: is_healed(latest(λx.has_concept(x, C0160087)))
Condition Time 53 Q: When did he develop microalbuminuria?
LF: time(latest(λx.has_concept(x, C3875084)))