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5-HIAA (5- HYDROXY INDOLE ACETIC ACID), 24- HOUR URINE# IN

5-HIAA (Hydroxyindoleacetic Acid) Urine 24H test measures the amount of 5-HIAA in your urine over a 24-hour period. 5-HIAA is a breakdown product of serotonin, a neurotransmitter.
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