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Homovanillic Acid, random urine
| Item | Value | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Approval req'd? | No | ||||||||||||||||||||||||
| Available Stat? | No | ||||||||||||||||||||||||
| Test code | HVAR | ||||||||||||||||||||||||
| Test group | Homovanillic | ||||||||||||||||||||||||
| Performed by | Quest | ||||||||||||||||||||||||
| Sendout? | Yes | ||||||||||||||||||||||||
| Method | HPLC, ECD | ||||||||||||||||||||||||
| Patient Preparation | It is preferable for the patient to be off medications for three days prior to collection. However, common antihypertensives (diuretics, ACE inhibitors, calcium channel blockers, alpha and beta blockers) cause minimal or no interference. Patient should avoid alcohol, coffee, tea, tobacco and strenuous exercise prior to collection. | ||||||||||||||||||||||||
| Container type | Urine cup | ||||||||||||||||||||||||
| Amount to Collect | See preferred volume | ||||||||||||||||||||||||
| Sample type | Random urine | ||||||||||||||||||||||||
| Preferred volume | 10 mL urine | ||||||||||||||||||||||||
| Min. Volume | 5 mL urine | ||||||||||||||||||||||||
| Processing notes | Preferably the sample should be acidified with 6N HCl (or boric acid) to pH < 3. Quest will accept samples from IMMEDIATELY after collection at -20C. Ship frozen. Order Quest Test #84855N. Samples for Brown & Toland patients MUST be acidified or LabCorp will reject. Order test # 120246 |
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| Units | mg/g creatinine | ||||||||||||||||||||||||
| Normal range | Homovanillic acid in random urine:
Creatinine in random urine:
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| Synonyms | HVA | ||||||||||||||||||||||||
| Turn around times | Test run four days a week. Reports in two days. | ||||||||||||||||||||||||
| Additional information | Homovanillic acid (HVA, 4-hydroxy-3-methoxyphenylacetic acid) has been identified as the principal urinary metabolite of dopa and dopamine. HVA is excreted in free form in relatively large amounts, and is frequently measured to support a diagnosis of neuroblastoma and malignant pheochromocytoma. HVA has been used to monitor chronic lead exposure and response to medication during the treatment of Parkinson's disease. | ||||||||||||||||||||||||
| LOINC code | 11146-8 | ||||||||||||||||||||||||
| Last Updated | 3/24/2013 7:49:36 PM | ||||||||||||||||||||||||
| Entry Number | 536 |
If you have additional questions regarding this test, please call: 415-353-1667