MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Home pregnancy test. Test strip (lower centre) used to test urine for a hormone produced during a pregnancy. The strip is dipped into urine in a sample pot (centre right). Lines corresponding to those shown in the literature (centre) indicate a positive (pregnant), negative (not pregnant) or invalid result. The lines show that human chorionic gonadotrophin (HCG) hormone has been detected. The HCG hormone is produced by the placenta, the organ that attaches an embryo to the wall of the uterus.
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