The following example illustrates a MedicationAdministration not done:


// connectathon/fhir4/cql/EXM108_FHIR4-8.2.000.cql
define "No Low Dose Unfractionated Heparin Administration":
  ["MedicationAdministration": medication in "Low Dose Unfractionated Heparin for VTE Prophylaxis"] VTEMedication
    where VTEMedication.status = 'not-done'

See the patterns page for implementation and usage patterns.