The person object is the primary object in a system record or SBR, and stores demographic information about a patient. Each record can have only one person object. By default, the person object of the SBR contains the information from each system that is determined to be the best information by the survivor calculator. Certain fields must be entered in the person object in order to save a patient profile. By default, these fields include first and last names, date of birth, and gender.