ABO typing studies on liquid urines.

ABO typing was successfully performed on 46 urine samples whose ABO group and secretor status had been determined previously from blood and saliva. Twenty-four urine samples were collected on which blind studies, time studies, and storage studies were performed. Multiple urines from several individuals were collected to evaluate the duplicity of the test. Also, urines were collected from pregnant and menstruating females to determine if ABO typing was affected under these conditions. Results of these studies are discussed.