Drug Concentration in Serum or Plasma (Hydrocodone)

Why This Test Is Done

Your healthcare provider may order this test if you’re taking hydrocodone for pain relief, if you’ve experienced side effects, or if you’re concerned about drug interactions or dependence. It may also be used to verify compliance with prescribed doses or to adjust medication levels based on your response.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast before the test, depending on the lab’s instructions. Bring a list of all medications, including over-the-counter drugs and supplements, to share with your provider.

During the Test

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but the procedure is quick and typically painless. The blood sample is then sent to a lab for testing.

What the Results Mean

Results will show the concentration of hydrocodone in your blood. While specific reference ranges can vary by lab, higher levels may indicate overdose, toxicity, or improper dosing. Lower levels might suggest insufficient pain relief or non-compliance. Always discuss results with your provider.