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': 'survey', 'display': 'Survey'}]}], 'code': {'coding': [{'system': 'http://loinc.org', 'code': '55758-7', 'display': 'Patient Health Questionnaire 2 item (PHQ-2) total score [Reported]'}], 'text': 'Patient Health Questionnaire 2 item (PHQ-2) total score [Reported]'}, 'subject': {'reference': 'urn:uuid:514d3cd5-9d59-c1c1-9457-aad183a74c4f'}, 'effectiveDateTime': '2023-11-04T14:36:13+05:30', 'valueQuantity': {'value': 1, 'unit': '{score}', 'system': 'http://unitsofmeasure.org', 'code': '{score}'}, 'interpretation': None}