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Lab Test Dictionary

Homovanillic Acid, Random Urine (6346X)


High Performance Liquid Chromatography (HPLC); Electrochemical Detection



Specimen Type

Urine, Random

Performing Lab

Quest Diagnostics San Juan Capistrano

Epic ID


Lab Test Days

Tuesday and Friday

Standard TAT

3-7 Days

Collection Information

Specimen Required

5-10 mL Random Urine

Container Type

Sterile Container

Collection Instructions

It is preferable for the patient to be off medications for three days prior to collection. However, common antihypertensives (diuretics, ACD inhibitiors, 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.

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp=7 Days; Refrigerated=7 Days; Frozen=28 Days

Rejection Criteria

pH > 3.0 and received unfrozen

Test Volume Required

10 mL Random Urine

Minimum Test Volume

5 mL Random Urine

Processing Instructions

pH adjusted to < 3.0 using 6N HCI. Urine without preservative is acceptable if pH is below 6 and the sample is shipped frozen. Indicate pH in comments, on specimen and on batch sheet.

Included Tests

Includes creatinine.

CPT Codes

82570, 83150