Comparison of hemagglutination inhibition pregnancy tests in the chimpanzee and the orangutan

A hemagglutination inhibition pregnancy test (Subhuman Primate Pregnancy Test), based on antiserum to the beta-subunit of ovine luteinizing hormone was evaluated for use in the chimpanzee and orangutan. The test was shown to give earlier indication of pregnancy in both species that two sensitive tests currently available for use in man (the Pregnosticon Accusphere Test and the UCG-Test). A comparison of sensitivity to chimpanzee chorionic gonadotropin was performed. The Subhuman Primate Pregnancy Test was 10 and 15 times as sensitive as the UCG-Test and the Pregnostican Accusphere Test respectively.