Understanding Your Laboratory Test: A Complete Patient Guide
A urine test to detect the presence of benzodiazepines, a class of commonly prescribed sedative medications.
{"This test checks if benzodiazepine medications are present in your urine","Benzodiazepines include drugs like lorazepam, diazepam, and alprazolam","The test is often used for medication monitoring or substance abuse screening","Results typically show as positive or negative","Follow your healthcare provider's instructions regarding medication disclosure before testing"}
Key facts at a glance
- LOINC
- 3390-2
- Short code
- BENZO-U
- Synonyms
- Benzodiaz Ur Ql
- Category
- chemistry
- Sample
- urine
- Container
- Sterile, leak-proof urine collection container without preservatives; prefer tamper-evident container for forensic specimens
- Units
- N/A
- Ref low
- 1
- Ref high
- 7
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- Immunoassay (EIA) with confirmation by Gas Chromatography-Mass Spectrometry (GC-MS) or Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
- CPT
- 80307
- SNOMED
- 44259005
- Specimen volume
- 30-50 mL of random urine specimen; minimum 10 mL required
- Stability
- Refrigerated (2-8°C): up to 7 days; Frozen (-20°C or below): up to 1 month for confirmation testing. Room temperature stability limited to 24-48 hours.
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–72 hours
- Order
- routine
This laboratory test is a diagnostic tool that helps your healthcare provider evaluate your overall health, screen for potential medical conditions, or monitor a condition you have already been diagnosed with. The results provide valuable information that guides decisions about your treatment plan and follow-up care.
The Benzodiazepines Urine Test is a diagnostic test that detects the presence of benzodiazepines in your urine. Benzodiazepines are a class of prescription medications commonly used to treat anxiety, insomnia, seizures, and muscle spasms. Examples include lorazepam (Ativan), diazepam (Valium), alprazolam (Xanax), and clonazepam (Klonopin).
The test is performed by a trained healthcare professional, usually in a clinic, hospital, or laboratory setting. Depending on the type of test, this may involve drawing a small sample of blood from a vein in your arm, collecting a urine sample, or obtaining a swab. The sample is then sent to a laboratory for analysis, and the procedure typically takes only a few minutes.
A urine sample is collected in a clean container. The sample is then analyzed in a laboratory using immunoassay techniques to detect the presence of benzodiazepines or their metabolites. The test is qualitative, meaning it provides a positive or negative result rather than measuring the exact amount of drug in your system.
Preparation depends on the specific test your provider has ordered. You may be asked to fast for 8 to 12 hours before the test, drink extra water, or temporarily avoid certain medications or supplements. Always follow the instructions provided by your healthcare team, and let them know about any medications you are taking, as some can affect the results.
Inform your healthcare provider about all prescription medications, over-the-counter drugs, and supplements you are taking, as some substances may affect the test results. You may be asked to avoid certain foods or beverages before the test. Follow any specific instructions provided by your healthcare team.
Your results will be compared against established reference ranges, and your healthcare provider will interpret them in the context of your symptoms, medical history, and overall health. Values that fall outside the normal range do not always indicate a serious problem, so discuss your results with your provider to understand what they mean and whether any further testing or treatment is recommended.
Results are typically reported as Positive or Negative. A positive result indicates that benzodiazepines or their metabolites were detected in your urine. A negative result means no benzodiazepines were detected, or the level is below the test's detection threshold. Your healthcare provider will interpret the results in the context of your medical history and current medications.
Reference range
Negative (Cutoff: 200 ng/mL for screening; 100 ng/mL for confirmation). Detection window typically 1-7 days post-ingestion depending on benzodiazepine type and chronicity of use.N/A
No fasting required. Patient should be informed that certain prescription medications, over-the-counter drugs, and herbal supplements may produce false positive results. Collect specimen under chain-of-custody protocol if required for forensic or workplace testing.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is commonly used for medication compliance monitoring to ensure patients are taking their prescribed benzodiazepines as directed. It is also used in substance abuse screening programs, pre-employment testing, and forensic testing. Healthcare providers may order this test to monitor for drug misuse, verify medication history, or evaluate patients with symptoms of benzodiazepine use or overdose.
Frequently asked questions
How long do benzodiazepines stay in urine?
Can a positive result occur from my prescription medication?
Will over-the-counter medications affect the test?
Is the test painful?
Sources
- 1
- 2
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