Query: What were my Calcium levels in my latest blood test results?, FHIR Resource: {'resourceType': 'Observation', 'status': 'final', 'category': [{'coding': [{'system': 'http://terminology.hl7.org/CodeSystem/observation-category', 'code': 'laboratory', 'display': 'Laboratory'}]}], 'code': {'coding': [{'system': 'http://loinc.org', 'code': '49765-1', 'display': 'Calcium [Mass/volume] in Blood'}], 'text': 'Calcium [Mass/volume] in Blood'}, 'subject': {'reference': 'urn:uuid:514d3cd5-9d59-c1c1-9457-aad183a74c4f'}, 'effectiveDateTime': '2020-10-17T13:15:00+05:30', 'valueQuantity': {'value': 10.18, 'unit': 'mg/dL', 'system': 'http://unitsofmeasure.org', 'code': 'mg/dL'}, 'interpretation': None}