Homovanillic Acid, 24-hour urine (HVA)

24 hrs urine container with 15 mL of 50% HCl
(To be obtained from DPLM Client Services)

Urine
24 hrs urine collection

Minimum aliquot volume : 30 mL urine

Total 24 hr urine volume must be clearly indicated

Average: 7 days (3 - 11 days)

Document Title

Instructions before sampling

Patient Preparation:

1. Patient should abstain from the following at least 3 days prior to and during urine specimen collection:

1.1 Where medically possible, drugs such as drugs containing phenotiazines which may potentially interfere with the testing.

2. If the patient cannot be completely removed from a drug regime, test result should be interpreted with appropriate clinical judgement based on expected physiology response to these drugs.