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The Phenobarbital (Serum) Test measures the amount of phenobarbital in your blood to help keep treatment in a safe and effective range. You might also hear it called a phenobarbital level, phenobarbital blood level, or therapeutic drug monitoring for phenobarbital. You can book this test at participating labs on LabFinder.
A phenobarbital TDM test or PB level shows how much of the seizure medicine is in your bloodstream right now. It helps your doctor see if the level is too low, in range, or too high, and guides dose changes if needed.
Common reasons: starting phenobarbital and setting the right dose, checking levels after a dose change, symptoms like sleepiness, dizziness, or confusion that might mean a high level, ongoing seizures that might mean a low level, and routine checks if you take other drugs that can affect phenobarbital.
Plan about 10 to 20 minutes at the lab. You will check in, confirm your information, and sit for a simple blood draw from your arm. A small bandage goes on afterward. Most people feel fine and can return to normal plans right away.
Yes, this is a quick, routine blood draw and is considered very safe. You might feel a quick pinch, notice a small bruise, or feel a little lightheaded for a moment afterward, but those effects usually fade quickly. Be sure to tell the staff if you take blood thinners, have a bleeding disorder, or if you have fainted during blood draws before. They will take extra care to keep you comfortable. Timing your blood draw in relation to your last dose can affect the result that day, so follow your doctor’s instructions.
Timing matters: Ask your doctor when to test, such as right before your next dose for a trough level. Do not skip doses unless told: Take your medicine as prescribed unless your doctor says otherwise. Bring details: Know your dose and the exact time of your last dose. Hydrate: Drink water so your veins are easier to find. Ask about other meds: Share a full list since some drugs can raise or lower phenobarbital levels.
Epilepsy and seizure disorders, breakthrough seizures that suggest a low level, side effects like extreme drowsiness or balance problems that suggest a high level, liver or kidney concerns that can change drug levels, and possible drug interactions. Results are interpreted in context. Your doctor will review your numbers with your history and symptoms before advising next steps.
With LabFinder, you can compare locations, see time slots, and book online at participating labs. It is easy to search for a convenient location in your area or by city or ZIP. Coverage varies by plan and provider, so check with your insurer and the lab when you schedule.
Book on LabFinder: find a lab today on our lab finder and request a test doctor guided.
The information on this page and throughout the LabFinder website and mobile app is for general informational purposes only. It is not intended to serve as medical advice, diagnosis, or treatment. For personalized medical advice or specific health concerns, please consult your healthcare provider directly.
Booking a Phenobarbital (Serum) Test is easy using LabFinder. Just choose your location and enter your insurance information to find the closest Phenobarbital (Serum) Test near you.
To make a same-day appointment for a Phenobarbital (Serum) Test, just choose your location and your insurance information to find the closest Phenobarbital (Serum) Test location near you. If there's availability for a same-day appointment at a nearby lab location, then you will be able to book it easily through LabFinder.
LabFinder allows you to easily schedule a Phenobarbital (Serum) Test. You can search by location and insurance to easily book a Phenobarbital (Serum) Test near you.
LabFinder allows you to easily make an appointment for a Phenobarbital (Serum) Test online. To make an appointment for a Phenobarbital (Serum) Test online, just choose your location and your insurance information to find the closest Phenobarbital (Serum) Test near you.
Yes, you can get a Phenobarbital (Serum) Test without insurance. LabFinder allows you to search and select "Self-Pay" when booking a Phenobarbital (Serum) Test. While pricing for the test may not be immediately available, please check by calling the lab company directly for pricing.
