How did the rabbit test to check pregnancy work?

When urine is injected into a rabbit, it makes the rabbit think that it is pregnant. The rabbit's ovaries then develop temporary tissue structure that are known as corpora lutea and corpora hemorrhagica. Doctors can then spot these growths.

The phrase "the rabbit died" occasionally pops up as old-fashioned way of saying a woman is pregnant, however the urine injection did not kill or torment the rabbit. Unfortunately, the fastest way to check the ovaries was to euthanize the rabbit and dissect it. So, whether the woman was pregnant or not, the rabbit died.

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