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The original was posted on /r/todayilearned by /u/nondescriptun on 2023-11-14 14:56:35.

Original Title: TIL about the “Rabbit Test,” a human pregnancy test developed in 1931, in which urine from a female human would be injected into a female rabbit. The rabbit would be dissected and if its ovaries were enlarged then the human was likely pregnant (~98% certainty). The test was used into the 1970s.