BSIP, CARDOSO / SCIENCE PHOTO LIBRARY BSIP, CARDOSO / SCIENCE PHOTO LIBRARY
Pregnancy test result. Young woman comparing the result of her home pregnancy test with the instructions. Most pregnancy tests work by detecting the presence of the hormone human chorionic gonadotrophin (hCG) in a woman's urine. This hormone is secreted by the placenta, the structure that attaches an embryo to the wall of the uterus (womb).
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