Performances of urine pregnancy tests on College of American Pathologists Survey specimens.

The participant performances on the College of American Pathologists (CAP) Urine Survey specimens distributed during 1979 and 1980 for pregnancy testing are reviewed. Almost all the reagent methods used by the participants performed well on the negative specimens. Prominent differences in results on the positive specimens were found. Awareness by laboratorians of the reagent sensitivity, limitations, and capabilities of commercial tests for determining human chorionic gonadotropin in urine is recommended.