HOMOVANILLIC ACID (HVA), 24-HOUR URINE (OS575)

Method

HPLC

Turnaround Time

SAMPLE DAILY BY 8:00 PM, REPORT AFTER 7-10 DAYS

Sample Type

50 ML (10 ML MIN.) ALIQUOT OF 24-HOUR URINE. ADD 50% HCL DROP BY DROP TO BRING THE PH BETWEEN 1–2. DO NOT USE CONCENTRATED HCL. PATIENT SHOULD STRICTLY AVOID L-DOPA AT LEAST 72 HOURS BEFORE AND DURING COLLECTION. MENTION TOTAL URINE VOLUME