Query: What was my Glomerular filtration rate when it was last checked?, 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': '5811-5', 'display': 'Specific gravity of Urine by Test strip'}], 'text': 'Specific gravity of Urine by Test strip'}, 'subject': {'reference': 'urn:uuid:dd5066ef-674c-3f45-1f3a-4e65602d398f'}, 'effectiveDateTime': '2002-11-20T16:56:17+05:30', 'valueQuantity': {'value': 1.0277, 'unit': '{nominal}', 'system': 'http://unitsofmeasure.org', 'code': '{nominal}'}, 'interpretation': None}