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phe·nol·sul·fon·phthal·e·in (PSP),(fē'nol-sŭl'fōn-thal'ē-in, -thal'ēn),
An indicator in tissue culture media (yellow at pH 6.8, red at pH 8.4); occurs as a bright to dark red crystalline powder; in the past given by parenteral injection as a test for renal function.
Synonym(s): phenol red
a bright red water-soluble triphenylmethane dye used as an indicator at pH 7.7. Also called phenol red. See also cystochromoscopy.
A bright red organic chemical C19H14O5S used diagnostically in studies of kidney function, bladder emptying, and, after intra-amniotic injection, in invasive tests for premature rupture of membranes.Synonym: phenol red
CAS # 143-74-8
an acid-base indicator dye; abbreviated PSP.
phenolsulfonphthalein (PSP) clearance test
after an injection of the dye, urine samples are collected at timed intervals and the amount of excreted dye is determined and plotted against time as an indicator of renal function, particularly renal blood flow, tubular excretion, and to some extent glomerular filtration.