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Watson-Schwartz test

Pronunciation: wot'son schworts

Definition: A qualitative screening test for diagnosis of acute intermittent porphyria, in which Ehrlich diazo agent and saturated sodium acetate are added to the urine. A pink or red color indicates the presence of porphobilinogen or urobilinogen. Because the former indicates porphyria and the latter does not, positive results require further differential extraction with butanol and chloroform to eliminate false-positive results.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.

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