Occurs as a bright to dark red crystalline powder; used as an indicator in tissue culture media (yellow at pH 6.8, red at pH 8.4); in the past given by parenteral injection as a test for renal function. SYN: phenol red.
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phe·nol·sul·fon·phtha·lein or chiefly Brit phe·nol·sul·phon·phtha·lein -.səl-fän-'thal-ē-ən, -'thal-.ēn, -'thāl- n a red crystalline compound C19H14O5S used chiefly as a test of kidney function and as an acid-base indicator called also phenol red
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phe·nol·sul·fon·phthal·ein (PSP) (fe″nol-sul″fon-thalґēn) a bright to dark red, crystalline powder that has been administered by intramuscular or intravenous injection to test renal function. Called also phenol red.Medical dictionary. 2011.