Benzodiazepine Test
Benzodiazepine Test is a laboratory test you can order directly. A benzodiazepine test checks for benzodiazepines, a class of prescription sedatives and anti-anxiety medicines, in a blood sample. It is ordered to confirm recent use, monitor prescribed therapy, or investigate suspected misuse or overdose.
- Sample type
- blood
- Category
- Drug & Urine Screening
- Turnaround
- 1-3 business days
- Price
- $45
- Referral
- Not required
A benzodiazepine test checks for benzodiazepines, a class of prescription sedatives and anti-anxiety medicines, in a blood sample. It is ordered to confirm recent use, monitor prescribed therapy, or investigate suspected misuse or overdose.
What it measures
- Diazepam — A common long-acting benzodiazepine; detected as the parent drug and its breakdown products.
- Lorazepam — A shorter-acting benzodiazepine often prescribed for anxiety.
- Alprazolam — The active ingredient in a widely prescribed anti-anxiety medicine.
- Clonazepam — A longer-acting benzodiazepine used for seizures and panic disorder.
- Metabolites — Breakdown products the body forms; some stay detectable longer than the original drug.
Who it is for
Emergency clinicians may order it after a suspected overdose, and prescribing clinicians may use it to check whether a medicine is being taken as directed. It can also be part of a broader drug screening panel.
Preparation
No fasting is required. Tell the person drawing your blood about all prescription, over-the-counter, and recreational substances you use, since these can affect the result.
Results and what they mean
Results are usually reported as detected or not detected, sometimes with a concentration and the specific substance found. A clinician interprets the result alongside your history, dose, and timing of use. This is general information, not medical advice; discuss your results with a qualified clinician.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the benzodiazepine test is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
How long do benzodiazepines stay detectable in blood?
It depends on the specific drug, dose, and how long you have taken it. Short-acting forms clear faster than long-acting ones, so timing varies by person.
Will a prescribed benzodiazepine show up?
Yes. The test detects prescribed benzodiazepines as well as non-prescribed use, so tell your clinician what you take.
Does this test measure the exact dose?
No. It shows whether a substance is present and roughly how much, but it cannot reliably confirm the exact dose taken.
Can other medicines cause a false result?
Some substances can interfere with certain test methods. Your clinician can order a more specific confirmatory test if needed.