Pyrazinamide Metabolite (N-Methylpyrazinamide) in Urine

Why This Test Is Done

Your healthcare provider may order this test if you’re taking pyrazinamide, a medication used primarily to treat tuberculosis (TB). It helps ensure the drug is working as intended and that your body is processing it safely. This is particularly important during TB treatment, where monitoring drug levels can prevent resistance or side effects.

What to Expect Before the Test

No special preparation is needed. You’ll provide a urine sample, typically collected over a 24-hour period. Your doctor or lab technician will guide you on timing and collection. If you’re unsure, ask your provider for specific instructions.

How the Test Works

Your urine sample is analyzed to detect the metabolite N-Methylpyrazinamide. Advanced laboratory techniques, such as mass spectrometry, identify and quantify this substance. The results help assess how your body metabolizes pyrazinamide.

Possible Results and Interpretation

Results are qualitative (present or absent) rather than quantitative, meaning they indicate whether the metabolite is detected in your urine. High levels may suggest issues with drug metabolism, while consistent detection supports proper treatment. Your provider will discuss findings with you based on your clinical context.