Query: What were the results of my last potassium blood test?, FHIR Resource: {'resourceType': 'Immunization', 'status': 'completed', 'vaccineCode': {'coding': [{'system': 'http://hl7.org/fhir/sid/cvx', 'code': '113', 'display': 'Td (adult), 5 Lf tetanus toxoid, preservative free, adsorbed'}], 'text': 'Td (adult), 5 Lf tetanus toxoid, preservative free, adsorbed'}, 'patient': {'reference': 'urn:uuid:fd02455e-d1b2-89cd-7de0-c51b92674b57'}, 'occurrenceDateTime': '2000-10-31T17:35:36+05:30', 'primarySource': True}