The most important information to obtain initially from a patient is biographic data. These include the patient’s full name, address, age, gender, occupation, and marital status, as well as the name of the patient’s primary care physician. The clinician uses this information, along with an impression of the patient’s intelligence and personality, to assess the patient’s reliability. This is important because the validity of the medical history provided by the patient depends primarily on the reliability of the patients a historian. If the identification data or patient interview gives the clinician reason to. suspect that the medical history will be unreliable, alternative methods of obtaining the necessary information should be found. A reliability assessment should continue throughout the entire history interview and physical examination, with the interviewer looking for illogical, improbable, or inconsistent patient responses that might suggest the need for corroborating information.