Homovanillic Acid, Urine
Centralized Core Laboratory:Chemistry
24 hour urine collection
Sent to reference lab
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Add 25.0 mL of 50% acetic acid as preservative at start of collection. 7.0 mL aliquot from a well-mixed 24 urine collection. Instruct patient on 24 hour urine collection. To begin the urine collection, have the patient void. DISCARD THIS URINE SPECIMEN. This is best done with the first morning specimen. Note the time and record on the requisition. From then on collect all the urine that is voided and place in container. If more than one container is needed, please mark the first as #1 of 2 and retain on the floor until the collection is complete. The final void should be made 24 hours after the first void described earlier. The specimen should be included with the collection.
For Outpatients, test should only be drawn in outpatient locations within a Hospital (Akron or Beeghly).
THIS TEST IS FOR 24HR COLLECTIONS ONLY. FOR RANDOM SPECIMENS PLEASE ORDER ON A MANUAL REQUISITION.
Ref. range is age dependent; available on patient report