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A false negative error, or false negative, is a test result which wrongly indicates that a condition does not hold. For example, when a pregnancy test indicates a woman is not pregnant, but she is, or when a person guilty of a crime is acquitted, these are false negatives.
The rabbit test became a widely used bioassay (animal-based test) to test for pregnancy. The term "rabbit test" was first recorded in 1949, and was the origin of a common euphemism, "the rabbit died", for a positive pregnancy test. [4] The phrase was, in fact, based on a common misconception about the test.
The Hogben test procedure consisted of injecting a sample of women's urine into the skin on the back of the frog, specifically into the dorsal lymph sac. [16] Around 12 hours later, results could be seen. If the woman was pregnant, then the frog would be ovulating, and a small cluster of eggs could be seen at the rear end of the frog.
Gravindex is an agglutination inhibition test performed on a urine sample to detect pregnancy. [1] It is based on double antigen antibody reaction. The test detects the prevention of agglutination of HCG -coated latex particles by HCG present in the urine of pregnant women.
A later article, independently authored, granted Hogben credit for the principle of using Xenopus to determine gonadotropin levels in a pregnant woman's urine, but not for its usage as a functional pregnancy test. [40] Hormonal pregnancy tests such as Primodos and Duogynon were used in the 1960s and 1970s in the UK and Germany. These tests ...
People who wish to look pregnant, generally for social, sexual, psychological or entertainment purposes, have the option of body suits and the like to wear under their clothes. It can be done by using pillows or pads, or light-weighing, small balls with a round shape to simulate a pregnant abdomen.
Examination, ultrasound, and pregnancy tests can be used to rule out false pregnancy. [1] False pregnancy has a prominent psychiatric component as well as physical manifestations of pregnancy. [2] It can be caused by trauma (either physical or mental), a chemical imbalance of hormones, [2] [3] and some medical conditions. [1]
This category is for articles about tests to see whether someone is pregnant. Pages in category "Tests for pregnancy" The following 10 pages are in this category, out of 10 total.