Watson–Schwartz test

The Watson–Schwartz test is a screening test for diagnosing intermittent porphyria, although it might also become positive in porphyria cutanea tarda (a skin form of porphyria). In this method, porphobilinogen is detected by a color reaction with Ehrlich reagent and confirming that the color is not removed by chloroform. As the test is just a screening test, it usually is confirmed by a more specific test such as a Hoesch test.[1][2][3][4]

References

Richard Ravel (1989). Clinical Laboratory Medicine: Clinical Application of Laboratory Data. Year Book Medical Publishers. ISBN 978-0-8151-7098-3.
Richard A. McPherson (27 January 2017). Henry's Clinical Diagnosis and Management by Laboratory Methods: First South Asia Edition_e-Book. Elsevier Health Sciences. pp. 459–. ISBN 978-81-312-4677-1.
Norbert W. Tietz (1987). Fundamentals of clinical chemistry. W.B. Saunders. ISBN 978-0-7216-8862-6.
Mary Louise Turgeon (14 April 2014). Linne & Ringsrud's Clinical Laboratory Science – E-Book: The Basics and Routine Techniques. Elsevier Health Sciences. pp. 395–. ISBN 978-0-323-29280-1.

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[Ravel1989-1] Richard Ravel (1989). Clinical Laboratory Medicine: Clinical Application of Laboratory Data. Year Book Medical Publishers. ISBN 978-0-8151-7098-3.

[McPherson2017-2] Richard A. McPherson (27 January 2017). Henry's Clinical Diagnosis and Management by Laboratory Methods: First South Asia Edition_e-Book. Elsevier Health Sciences. pp. 459–. ISBN 978-81-312-4677-1.

[Tietz1987-3] Norbert W. Tietz (1987). Fundamentals of clinical chemistry. W.B. Saunders. ISBN 978-0-7216-8862-6.

[Turgeon2014-4] Mary Louise Turgeon (14 April 2014). Linne & Ringsrud's Clinical Laboratory Science – E-Book: The Basics and Routine Techniques. Elsevier Health Sciences. pp. 395–. ISBN 978-0-323-29280-1.