This is a critical Therapeutic Drug Monitoring (TDM) test to personalize your treatment. It measures the precise concentration of Valproic Acid—a medication for seizures, bipolar disorder, and migraines—in your bloodstream. This test is essential for ensuring your dose is in the effective (therapeutic) range and, just as importantly, below a toxic level. A simple blood draw is required. This test is key to your safety and success. It allows your doctor to fine-tune your dosage, minimizing side effects and maximizing your results.