Test Code HVAURN Homovanillic Acd/U

Important Note

Abstain from medications for 72 hours prior to collection

Homovanillic acid (HVA) results are expressed as a ratio to creatinine excretion (mg/g CRT). No reference interval is available for results reported in units of mg/L

Additional Codes

80422

Methodology

Quantitative High Performance Liquid Chromatography - Tandem Mass Spectrometry

Specimen Type

Urine

Preferred Collection Container

Random or 24 hr urine no preservative

Collection Volume

4 mL aliquot from a well-mixed 24-hour or random collection

Minimum Collection Volume

1 mL aliquot from a well-mixed 24-hour or random collection

Collection Instructions

For 24 hour collecitons instruct the patient to void at 8:00 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period, i.e., 8:00 AM the next morning. Refrigerate during collection. Screw the lid on securely. Specimens should be transported promptly to the Clinical Laboratory. Container must be labelled with patient's full name, room number, date and time collection started, and date end time collection finished.

Transport

Refrigerated

Rejection Criteria

Specimen types other than urine

Specimen Storage and Stability

Ambient: Unacceptable; Refrigerated: 1 week; Frozen: 2 weeks

Turn Around Time

2-6 days

Lab Department

Referred Testing

Test Alias

80422; HVA; 3-Methoxy-4-Hydroxy Phenylacetic Acid; 4-Hydroxy-3-methoxyphenylacetic acid

CPT Coding

83150

EPIC Code

LAB401

Acceptable Collection Container