https://www.hl7.org/fhir/DSTU2/familymemberhistory.html Family History API retrieves a bundle with available family history IDs. Family Histories are significant health events and conditions for a particular individual related to the subject. This information can be known to different levels of accuracy. Sometimes the exact condition ('asthma') is known, and sometimes it is less precise ('some sort of cancer'). Equally, sometimes the person can be identified ('my aunt Agatha') and sometimes all that is known is that the person was an uncle. Date range search always returns the latest family history information filtered by family members and history. NOTE: The number of records returned can be limited and is defaulted to 500.