Vanillylmandelic Acid (VMA), Urine VMAU
|Method(s)||Quantitative High Performance Liquid Chromatography- Tandem Mass Spectrometry|
|Collect||Random or 24-hour urine. 24-hour samples should be refrigerated during collection.|
4 mL aliquot from a well-mixed random or 24-hour collection, at 2-8°C. Record 24-hour total volume on tube. (Min: 1 mL)
|Stability||Ambient: Unacceptable; Refrigerated: 1 week; Frozen: 2 weeks|
|Notes||Refrigeration is the preferred method of preservation. Record total volume and collection time interval on transport tube and test request form.|
|Preferred Specimen Collection Device(s)|
VMA, Urine: 18 years and older: 0.0-7.0 mg/d.
The VMA-to-creatinine ratio will be reported when the patient is under 18 years, the urine collection is random or other than 24 hours, or the urine volume is less than 400 mL/24 hours.