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The Kastle–Meyer test is a presumptive blood test, first described in 1903, in which the chemical indicator phenolphthalein is used to detect the possible presence of hemoglobin. It relies on the peroxidase -like activity of hemoglobin in blood to catalyze the oxidation of phenolphthalin (the colorless reduced form of phenolphthalein) into ...
A reduced form of phenolphthalein, phenolphthalin, which is colorless, is used in a test to identify substances thought to contain blood, commonly known as the Kastle–Meyer test. A dry sample is collected with a swab or filter paper.
Kastle-Meyer test for blood; Malachite green test for blood; Marquis reagent for narcotics and alkaloids; Benzidine test for blood which changes from clear to blue in color with the presence of blood; Luminol, phenolphthalein, Hemastix, Hemident, and Bluestar are all also used for blood testing [citation needed]
A new blood test was found to detect colon cancer with more than 80% accuracy — and to rule it out for 90% of healthy people. Doctors speak about how this could improve screening rates and outcomes.
As with most blood tests, false-negatives can happen, meaning results could come back negative when a cancer does exist — although Grail reports that negative cancer test results from Galleri ...
Officers said they found stains in the shower “and Phenolphthalein presumptive blood test was positive for blood. Swabs were recovered.” Detectives said Gray waived his Miranda Rights and ...