Query: What was my latest Hematocrit value?, 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': '4544-3', 'display': 'Hematocrit [Volume Fraction] of Blood by Automated count'}], 'text': 'Hematocrit [Volume Fraction] of Blood by Automated count'}, 'subject': {'reference': 'urn:uuid:f8ab9da3-c15b-2f9d-7e8a-a8f255274ecb'}, 'effectiveDateTime': '2021-12-20T18:18:35+05:30', 'valueQuantity': {'value': 48.463, 'unit': '%', 'system': 'http://unitsofmeasure.org', 'code': '%'}, 'interpretation': None}