Vanillylmandelic Acid (VMA), 24-Hour Urine
Test Code: 004143
Performing Lab: LabCorp
CPT Code: 84585 001
Synonym
3-Methoxy-4-Hydroxymandelic Acid, 24-Hour Urine; VMA, 24-Hour Urine
Specimen Type
Urine (24-hour)
Specimen Container
Plastic urine container, no preservative (preferred), or acidic preservative
Volume
4 mL aliquot
Minimum Volume
1 mL aliquot (Note:This volume does NOT allow for repeat testing).
Specimen Handling
Instruct the patient to void at 8 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM the next morning). Measure and record total urine volume. Mix well; send aliquot. Label container with patient's name, date and time collection started, and date and time collection completed.
Patient Prep
Patient should avoid salicylates, caffeine, phenothiazine, and antihypertension agents. Also coffee, tea, chocolate, fruit (especially bananas and any vanilla containing substances for 72 hours prior to collection).
Temperature
Vanillylmandelic acid is STABLE at room temperature unpreserved for seven days.
Methodology
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Stability
Room Temperature: 7 days
Refrigerated: 14 days
Frozen: 14 days
Refrigerated: 14 days
Frozen: 14 days
| Result Code | Result Name | LOINC |
|---|---|---|
| 004144 | VMA, Urine | 9624-8 |
| 004145 | VMA, Urine, 24hr | 3122-9 |
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