Limitations of the nonhuman pregnancy kit for pregnancy diagnosis in baboons.

The Nonhuman Primate Pregnancy Test (NHPPT) kit was evaluated for diagnosis of pregnancy in baboons. Unreadable controls rendered 33% of all tests inconclusive. Refrigeration and dilution did little to improve the number of inconclusive tests. Positive-and false-negative results from readable tests on days 20 to 27 of confirmed pregnancy were 75% and 25%, respectively. The NHPPT did not always provide an accurate diagnosis of pregnancy and often proved unreadable.