Phenol red was used in the phenolsulfonphthalein test, also known as the PSP test. This test was used to estimate the overall blood flow through the kidney and is now obsolete.
The test is based on the fact that phenol red is excreted almost entirely in the urine. Phenol red solution is administered intravenously, the urine produced is collected. By measuring the amount of phenol red excreted colorimetrically, kidney function can be determined.
Read more about this topic: Phenol Red
Famous quotes containing the word test:
“There is held to be no surer test of civilisation than the increase per head of the consumption of alcohol and tobacco. Yet alcohol and tobacco are recognisable poisons, so that their consumption has only to be carried far enough to destroy civilisation altogether.”
—Havelock Ellis (1859–1939)