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Pee is for Pregnant: The history and science of urine-based pregnancy tests
Honestly, just take a minute to sit with that. Upon closer inspection of the photo, I became increasingly skeptical that the jar actually contained urine. The color seemed wrong to me. Frankly, it looked a little like coconut water.
In the first known pregnancy tests, ancient Egyptian women urinated on barley or wheat seeds: quickly sprouting seeds indicated pregnancy. The ancient Egyptians were certainly onto something, as modern pregnancy tests work in much the same way: they detect a hormone in urine. However, the first of the modern tests that could accurately detect pregnancy was no less bizarre.