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Test Code VMAR Vanillylmandelic Acid (VMA), Random, Urine

Reporting Name

Vanillylmandelic Acid, Random, U

Useful For

Screening children for catecholamine-secreting tumors with a random urine collection when requesting vanillylmandelic acid only

 

Supporting a diagnosis of neuroblastoma

 

Monitoring patients with a treated neuroblastoma

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

Urine


Specimen Required


Container/Tube: Plastic, 10-mL urine tube (T068)

Specimen Volume: 5 mL

Collection Instructions:

1. Collect a random urine specimen.

2. Adjust the random urine pH to a level between 1 and 5 by adding 50% acetic acid dropwise and checking the pH.

Additional Information:

1. Patient's age is required.

2. Administration of L-dopa may falsely increase vanillylmandelic acid results; it should be discontinued 24 hours prior to and during collection of specimen.


Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 28 days
  Frozen  180 days

Reference Values

<1 year: <25.0 mg/g creatinine

1 year: <22.5 mg/g creatinine

2-4 years: <16.0 mg/g creatinine

5-9 years: <12.0 mg/g creatinine

10-14 years: <8.0 mg/g creatinine

≥15 years (adults): <7.0 mg/g creatinine

Day(s) and Time(s) Performed

Monday through Friday; 8 a.m.

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

84585

LOINC Code Information

Test ID Test Order Name Order LOINC Value
VMAR Vanillylmandelic Acid, Random, U 3124-5

 

Result ID Test Result Name Result LOINC Value
60274 Vanillylmandelic Acid, Random, U 3124-5

Reject Due To

Hemolysis

NA

Lipemia

NA

Icterus

NA

Other

NA

Method Name

Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)