Serum or Plasma Immunoassay for Homovanillic Acid (HVA)

What Is HVA Used For?

Doctors may order this test to evaluate dopamine function in cases of suspected neurological disorders, such as Parkinson’s disease, or to monitor treatment responses in patients with conditions affecting dopamine levels. It can also be part of broader metabolic or neurochemical assessments.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The blood is then processed into either serum (after clotting) or plasma (using an anticoagulant). The HVA level is measured using an immunoassay method, which detects specific chemical markers in the sample.

Preparation and Timing

No special preparation is typically needed for this test. However, your doctor may advise avoiding certain medications or foods that could influence dopamine metabolism before the test. Results may take several days to weeks to process, depending on lab capacity.

What Are Possible Results?

Results are presented as a concentration value (e.g., micrograms per liter) but do not include specific reference ranges. Interpretation depends on clinical context, such as whether the test is part of a diagnostic evaluation or monitoring plan.