Serum or plasma concentration of zolpidem (a benzodiazepine hypnotic)
This test measures the amount of zolpidem, a medication used to treat insomnia, in your blood. It helps assess drug levels after recent use.
["Understanding your zolpidem blood levels can help ensure safe dosing and avoid potential side effects."]
Key facts at a glance
- LOINC
- 72768-5
- Short code
- Zolpidem phenyl-4-carb Ur Cfm-mCnc
- Synonyms
- Zolpidem phenyl-4-carb Ur Cfm-mCnc
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- confirm
- Specimen volume
- 10 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may order this test if you’ve recently taken zolpidem (e.g., Ambien®) and want to check how much of the drug is in your system. It may also be used in cases of suspected overdose, drug interaction monitoring, or to evaluate compliance with treatment.
What to Expect Before the Test
No special preparation is needed. You may have blood drawn from a vein in your arm, similar to other routine blood tests. If you’re on blood thinners, let your provider know before the test.
What the Results Mean
Results show the concentration of zolpidem in your blood. High levels may indicate recent use or improper dosing, while very low levels could suggest recent elimination. Your provider will interpret results in the context of your medical history and symptoms.
Common Reasons for Testing
This test is often used to confirm recent zolpidem ingestion, assess toxicity, or monitor therapeutic drug levels in specialized cases (e.g., addiction treatment). It’s not typically a routine screening test unless directed by your doctor.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormally high zolpidem levels may cause drowsiness, confusion, or respiratory depression, especially if combined with other sedatives. Low levels may not indicate a problem unless your provider suspects non-compliance or rapid metabolism. Always discuss results with your healthcare provider.
Short name
Zolpidem Level
Frequently asked questions
How long does it take to get results from this test?
Can I stop taking zolpidem before this test?
Is this test covered by insurance?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy