Site-Specific Factor 17

Urinary 5-Hydroxyindoleacetic Acid (5-HIAA) Lab Value


**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 pre-treatment 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




NAACCR #2871


Code Description
000 0 milligrams/24 hours (mg)/24hours
001 1 or less milligrams/24hours
002-979 2-979 milligrams/24hours
980 980 or greater milligrams/24hours
988 Not applicable: Information not collected for this case
997 Test ordered, results not in chart
998 Test not done (test was not ordered and was not performed)
999 Unknown or no information
Not documented in patient record