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5-hydroxyindoleacetic acid (5-HIAA)in 24 hour urine

Indications: - evaluation of carcinoid tumor Reference values: - 2-9 mg/24 hours (10-47 umol/24 hours) Clinical significance: - sensitive & specific for carcinoid Increases: - seen in carcinoid syndrome Specimen: - 24 hour urine - 48 hours before undergoing 5-HIAA urine collection, patients should avoid foods rich in 5-HT (bananas, avocados, grapefruit, tomatoes, eggplant, hickory nuts, walnuts) [3]

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5-OH indoleacetic acid

General

24 hour urine 5-hydroxyindoleacetic acid in urine

References

  1. Medical Knowledge Self Assessment Program (MKSAP) 11, American College of Physicians, Philadelphia 1998
  2. Panel of 9 tests Laboratory Test Directory ARUP: 80420
  3. Ahmad A (slide show) Carcinoid Tumors: Cancers in Slow Motion. Medscape. March 30, 2016 http://reference.medscape.com/features/slideshow/carcinoid-tumors