Homovanillic Acid and Vanillylmandelic Acid

Homovanillic Acid and Vanillylmandelic Acid is a topic covered in the Davis's Lab & Diagnostic Tests.

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To assist in diagnosis of neuroblastoma, pheochromocytoma, and ganglioblastoma and to monitor therapy.

Patient Preparation
There are no food, fluid, or activity restrictions unless by medical direction. If possible, and with medical direction, patients should withhold acetylsalicylic acid, disulfiram, pyridoxine, and reserpine for 2 days before specimen collection. Levodopa should be withheld for 2 wk before specimen collection. The test should begin between 0600 and 0800 if possible. Usually, a 24-hr urine collection is ordered. As appropriate, provide the required urine collection container and specimen collection instructions.

Normal Findings
Method: Chromatography.

AgeConventional UnitsSI Units
Homovanillic Acid(Conventional Units × 5.49)
 3–6 yr1.4–4.3 mg/24 hr8–24 micromol/24 hr
 7–10 yr2.1–4.7 mg/24 hr12–26 micromol/24 hr
 11–16 yr2.4–8.7 mg/24 hr13–48 micromol/24 hr
 Adult–older adult1.4–8.8 mg/24 hr8–48 micromol/24 hr
Vanillylmandelic Acid(Conventional Units × 5.05)
 3–6 yr1–2.6 mg/24 hr5–13 micromol/24 hr
 7–10 yr2–3.2 mg/24 hr10–16 micromol/24 hr
 11–16 yr2.3–5.2 mg/24 hr12–26 micromol/24 hr
 Adult–older adult1.4–6.5 mg/24 hr7–33 micromol/24 hr

Critical Findings and Potential Interventions

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