VMA 24-Hour Urine Quantification
8 days
Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
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Urinary test for catecholamine metabolites. Used in pheochromocytoma diagnosis.
24 hour urine
4 mL aliquot
Plastic urine container, no preservative (preferred), or acidic preservative
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).
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
| Temperature | Period |
|---|---|
| Room temperature | 7 days |
| Refrigerated | 14 days |
| Frozen | 14 days |
| Freeze/thaw cycles | Stable x3 |