Urinary chorionic gonadotropin levels in pregnant golden lion tamarins. Preliminary observations.

We have established the interval over which urinary chorionic gonadotropin can be detected by a radioimmunoassay during pregnancy in the golden lion tamarin. Preliminary findings indicate the potential value of this radioimmunoassay system for (1) diagnosis of pregnancy at about four weeks after fertilization; (2) estimation of the expected time of delivery; and (3) identification of individual monkeys having an apparent high risk of spontaneous abortion.