when was the first home pregnancy test invented
Pregnancy test A pregnancy test attempts to determine whether a woman is pregnant. Markers that indicate are found in urine and blood, and pregnancy tests require sampling one of these substances. The first of these markers to be discovered, human chorionic gonadotropin (hCG), was discovered in 1930 to be produced by the syncytiotrophoblast cells of the fertilised ova (eggs). While hCG is a reliable marker of pregnancy, it cannot be detected until after implantation:[1] this results in false negatives if the test is performed during the very early stages of pregnancy. HCG can be detected via blood 8 days after fertilization of the egg, and in the urine 10 days after. Obstetric ultrasonography may also be used to detect pregnancy. Obstetric ultrasonography was first practiced in the 1960s; the first home test kit for hCG was invented in 1968.[2] The kits went on the market in the United States and Europe in the mid-1970s.
Birth control movement in the United States Birth control practices were generally adopted earlier in Europe than in the United States. Knowlton's book was reprinted in 1877 in England by Charles Bradlaugh and Annie Besant, with the goal of challenging Britain's obscenity laws.[12] They were arrested (and later acquitted) but the publicity of their trial contributed to the formation, in 1877, of the Malthusian League – the world's first birth control advocacy group – which sought to limit population growth to avoid Thomas Malthus's dire predictions of exponential population growth leading to worldwide poverty and famine.[13] By 1930, similar societies had been established in nearly all European countries, and birth control began to find acceptance in most Western European countries, except Catholic Ireland, Spain, and France.[14] As the birth control societies spread across Europe, so did birth control clinics. The first birth control clinic in the world was established in the Netherlands in 1882, run by the Netherlands' first female physician, Aletta Jacobs.[15] The first birth control clinic in England was established in 1921 by Marie Stopes, in London.[16]