Frog pregnancy test, 1950s

Frog pregnancy test, 1950s

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Credit: NATIONAL MUSEUM OF HEALTH AND MEDICINE/SCIENCE PHOTO LIBRARY

Caption: Frog pregnancy test. Frog being injected with a woman's urine to test for pregnancy. If the frog laid eggs or produced sperm, within 24 hours, the result was positive, indicating that the woman was pregnant. The effect is produced by pregnancy hormones. In the 1940s and 1950s, this was one of the tests used by doctors before home pregnancy tests became available. Known as the Hogben test, the frog normally used was the African clawed frog (Xenopus laevis). Photographed in a US military camp in Japan, in 1956.

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