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HelpTest Code Billings Clinic: 8520 Mayo: HVA Homovanillic Acid, 24 Hour, Urine
Reporting Name
Homovanillic Acid (HVA), 24 Hr, UPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Screening children for catecholamine-secreting tumors using a 24-hour urine collection when requesting homovanillic acid only
Monitoring neuroblastoma treatment
Screening patients with possible inborn errors of catecholamine metabolism
Method Name
Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
Necessary Information
1. Collection duration and urine volume in milliliters are required.
2. Patient's age is required.
3. All patients receiving L-dopa should be identified to the laboratory when this test is ordered.
4. Bactrim may interfere with detection of the analyte. All patients taking Bactrim should be identified to the laboratory when this test is ordered.
Specimen Required
Patient Preparation: Administration of L-dopa may falsely increase homovanillic acid results; it should be discontinued 24 hours prior to and during specimen collection.
Supplies: Urine Tubes, 10 mL (T068)
Container/Tube: Plastic, 10-mL urine tube
Specimen Volume: 5 mL
Collection Instructions:
1. Add 25 mL of 50% acetic acid as preservative at start of collection. If specimen is refrigerated during collection, preservative may be added up to 12 hours after collection. Use 15 mL of 50% acetic acid for children younger than 5 years. This preservative is intended to achieve a pH of between approximately 1 and 5.
2. Collect a 24-hour urine specimen.
3. If necessary, adjust urine pH to a level between 1 and 5 by adding 50% acetic acid or hydrochloric acid dropwise and checking the pH.
Additional Information:
1. The sensitivity of this test is greater on a 24-hour specimen than on a random specimen.
2. See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Specimen Type
UrineSpecimen Minimum Volume
2 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 28 days | |
| Frozen | 180 days |
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Reference Values
<1 year: <35.0 mg/g creatinine
1 year: <30.0 mg/g creatinine
2-4 years: <25.0 mg/g creatinine
5-9 years: <15.0 mg/g creatinine
10-14 years: <9.0 mg/g creatinine
≥15 years (adults): <8.0 mg/24 hours
Interpretation
Vanillylmandelic acid (VMA) and/or homovanillic acid (HVA) concentrations are elevated in over 90% of patients with neuroblastoma; both tests should be performed. A positive test could be due to a genetic or nongenetic condition. Additional confirmatory testing is required.
A normal result does not exclude the presence of a catecholamine-secreting tumor.
Elevated HVA values are suggestive of a deficiency of dopamine beta-hydrolase, a neuroblastoma, a pheochromocytoma, or may reflect administration of L-dopa.
Decreased urinary HVA values may suggest monoamine oxidase-A deficiency.
Day(s) Performed
Monday through Friday
Report Available
2 to 4 daysTest Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
83150
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| HVA | Homovanillic Acid (HVA), 24 Hr, U | 13760-4 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 3572 | Homovanillic Acid, Adult (>14 yr) | 2436-4 |
| 3573 | Homovanillic Acid, Child (<15 yr) | 13760-4 |
| TM39 | Collection Duration | 13362-9 |
| VL37 | Urine Volume | 3167-4 |
Forms
If not ordering electronically, complete, print, and send an Oncology Test Request (T729) with the specimen.