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Note 1: Carcinoid tumors can release large amounts of serotonin. 5-Hydroxyindoleacetic acid (5-HIAA) is-a breakdown product of the hormone serotonin. The 5-HIAA test measures the amount of acid secreted in the urine over a 24-hour period.
Note 2: Record to the nearest milligram (mg) the highest 5-HIAA lab value documented in the medical record prior to treatment. For example, code a pretreatment 5-HIAA of 550 mg over 24 hours as 550.
Note 3: Code 000 is reserved for exactly 0 mg (no measurable amount of 5-HIAA). Do not round tiny values down to 0 ng/ml; any measured value less than or equal to 1 mg should be coded 001. For code 001, also round 1.1-1.4 mg down to 1 ng/ml. For codes 002-979, round values to the nearest mg.
Note 4: For an uncertain value, record the stated closest value. For example, code a value stated as "less than 5 mg" as 005.

Code	Description
000	0 milligrams (mg)/24hours
001	1 or less mg/24hours
002-979	2-979 mg/24hours
980	980 or greater mg/24hours
988	Not applicable: Information not collected for this case (May include cases converted from code 888 used in CSv1 for "Not applicable" or when the item was not collected. If this item is required to derive T, N, M, or any stage, use of code 988 may result in an error.)
997	Test ordered, results not in chart
998	Test not done (test not ordered and not performed)
999	Unknown or no information Not documented in patient record

CS Site-Specific Factor 6Urinary 5-HIAA Lab Value