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Homovanillic Acid, 24 hour urine
| Item | Value | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Approval req'd? | No | ||||||||
| Available Stat? | No | ||||||||
| Test code | HVA | ||||||||
| Test group | Homovanillic | ||||||||
| Performed by | Quest | ||||||||
| Sendout? | Yes | ||||||||
| Method | HPLC, ECD | ||||||||
| Patient Preparation | Patient should avoid alcohol, coffee, tea, tobacco and strenuous exercise and discontinue at least 2 weeks prior to testing any treatment with L-DOPA, which interferes in the assay. | ||||||||
| Collection Instructions | Refrigerate container during collection. | ||||||||
| Container type | 24 hour urine collection container Click here for Urine Preservative Requirements |
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| Amount to Collect | Entire 24 hour urine output | ||||||||
| Sample type | 24 hour urine collection | ||||||||
| Preferred volume | 10 mL urine | ||||||||
| Min. Volume | 5 mL urine | ||||||||
| UCSF Rejection Criteria | Container not refrigerated during collection. | ||||||||
| Processing notes | Refrigerate a 10 mL aliquot of the well-mixed collection. The final pH should be < 3. Record the total urine volume on the test request and on the aliquot. Order Quest # 1248N | ||||||||
| Units | mg/24 h | ||||||||
| Normal range |
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| Synonyms | HVA | ||||||||
| Turn around times | Test run Monday-Friday. Turnaround time: 3-6 days. | ||||||||
| Additional information | To convert mg/d to mmol/d (SI units) multiply by 5.49. Creatinine is assayed as a measure of completeness of urine collection. If total creatinine excretion is not within normal limits for the patient's age and sex (see entry for Creatinine) and the patient has normal renal function, the urine collection is probably incomplete and the result is invalid. |
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| CPT coding | 83150-90 | ||||||||
| LOINC code | 2436-4 | ||||||||
| Last Updated | 3/24/2013 7:49:31 PM | ||||||||
| Entry Number | 535 |
If you have additional questions regarding this test, please call: 415-353-1667