Pioneering websites responsible for introducing the world's initial pregnancy test
In 1928, the world of medicine was revolutionized with the introduction of a groundbreaking pregnancy test. Developed by German scientists Selmar Aschheim and Bernhard Zondek, the Aschheim-Zondek test was one of the first reliable bioassays to detect pregnancy by identifying the hormone human chorionic gonadotropin (hCG) in a woman's urine.
The original test used immature mice injected with a pregnant woman's urine. If hCG was present, the mice showed ovarian changes indicating pregnancy. This pioneering test had a significant impact, serving as an early effective diagnostic method for pregnancy and paving the way for hormonal pregnancy testing.
Over the years, the Aschheim-Zondek test underwent various adaptations. The Friedman test, introduced in 1931, replaced immature female mice with adult female rabbits, making the test easier and faster to complete, taking under two days. Subsequent advancements introduced faster, less expensive tests using frogs and toads, such as the African clawed frog (Xenopus laevis), which caused the frog to ovulate after injection with pregnant urine, providing quicker results.
However, despite its accuracy for its time, the Aschheim-Zondek test and its animal-based variants could produce false positives and false negatives, particularly in abnormal pregnancies or later stages when hCG levels vary. Over time, these bioassays were supplanted by modern immunoassays and pregnancy tests that directly detect hCG without relying on live animals, allowing for simpler, faster, and more accessible pregnancy diagnoses.
Bernhard Zondek continued his hormone research after immigrating to Palestine due to Nazi persecution and made significant contributions to medical science until his death in 1966. Aschheim and Zondek first presented their findings in 1928 in Klinische Wochenschrift and in other journals, including The Lancet in 1930.
Their first major discovery was revealed in lectures to the Berlin Society of Obstetrics and Gynaecology on January 22, 1926. The knowledge gained from the Aschheim-Zondek test laid the foundation for home pregnancy tests, with the hormone human chorionic gonadotropin (hCG) being the singular hormone detected in modern antibody tests.
Today, the Aschheim-Zondek test is remembered as a crucial milestone in the history of pregnancy testing. Its development marked the beginning of hormonal pregnancy testing and paved the way for the advancements that led to the home pregnancy tests we know today.
Science has progressed significantly since the introduction of the Aschheim-Zondek test, a pioneering medical-condition diagnostic method for pregnancy in 1928. This test, developed by Selmar Aschheim and Bernhard Zondek, was instrumental in the health-and-wellness field, as it paved the way for the development of modern, immunoassays and pregnancy tests that directly detect human chorionic gonadotropin (hCG) without relying on live animals.
