Skip to content

Understanding Your Medical Test: A Patient's Guide to Testing, Results, and Follow-Up Care

Published: August 9, 2026Updated: August 16, 2026

This test checks whether benzodiazepine medications are present in your blood. It is commonly used to monitor medication use or detect potential misuse.

Quick summary

{"This test detects benzodiazepines (anti-anxiety/sleep medications) in your blood","It helps doctors monitor proper medication use or check for overdose","Results are typically reported as positive or negative","Common benzodiazepines include Valium, Xanax, and Ativan","Inform your doctor about all medications you are taking before the test"}

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
91036-4
Short code
BENZT
Synonyms
Benzodiaz Tiss Ql Scn
Category
chemistry
Sample
serum
Container
Red-top (no additive) or serum separator tube (SST) for serum collection. For tissue specimens, use a sterile, labeled specimen container without fixative or preservative.
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
screen
CPT
80307
SNOMED
395112001
Specimen volume
1 mL serum (minimum 0.5 mL)
Stability
Serum: Room temperature 24 hours; refrigerated (2-8°C) up to 7 days; frozen (-20°C or below) up to 30 days. Avoid repeated freeze-thaw cycles.
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test? This test is a medical procedure or laboratory analysis that your healthcare provider orders to help evaluate your overall health, check how well certain organs or body systems are working, or look for signs of a medical condition so that an accurate diagnosis and appropriate treatment plan can be made.

The Benzodiazepines Screen test is a blood test that checks for the presence of benzodiazepines in your system. Benzodiazepines are a class of prescription medications commonly used to treat anxiety, sleep disorders, muscle spasms, and seizures. This screening method can detect whether these drugs are present in your blood, helping your healthcare provider understand your medication history or check for potential issues.

Why might I need this test? Your provider may recommend this test if you are experiencing symptoms that need explanation, if you have a known health condition that requires ongoing monitoring, if your personal or family medical history suggests an increased risk of certain problems, or as part of a routine checkup to screen for issues before they cause noticeable symptoms.

Your doctor may order this test for several reasons: to monitor if you are taking your prescribed benzodiazepine medication properly, to check for accidental or intentional overdose, to evaluate unexplained symptoms that could be related to medication levels, or to screen for drug misuse in certain clinical settings. It may also be part of a broader drug screening panel.

How is the test performed? The test is usually done in a doctor's office, clinic, or hospital. Depending on the type of test ordered, a sample such as blood, urine, or tissue may be collected, or specialized equipment may be used to take images or measurements. The procedure is typically quick and safe, and most people can return to their normal activities right afterward.

A healthcare professional will draw a blood sample from a vein in your arm. The blood is then sent to a laboratory where it is analyzed using screening methods to detect the presence of benzodiazepines or their metabolites. The test is qualitative, meaning it typically reports whether benzodiazepines were found (positive) or not found (negative), rather than showing exact amounts.

What do the results mean? Your results will show whether your values or findings fall within the expected normal range. Normal results may indicate no sign of the condition being tested for, while abnormal results can point to an infection, inflammation, organ dysfunction, or other health issue that needs attention. Your provider will explain what your specific results mean in the context of your overall health and will discuss any follow-up testing, monitoring, or treatment options that may be needed.

A 'positive' result means benzodiazepines were detected in your blood sample. This could mean you have taken a prescribed benzodiazepine, an over-the-counter product containing benzodiazepines, or potentially an illicit substance. A 'negative' result means no benzodiazepines were detected at the time of testing. Your doctor will interpret these results along with your medical history and symptoms to determine the appropriate next steps.

Reference range

Negative (not detected). Cutoff concentration varies by laboratory; typical screening cutoff is 200 ng/mL for serum.N/A

Specimen: serum

No fasting required. Patients should be informed that benzodiazepines are central nervous system depressants and may cause sedation. Inform the laboratory of all medications taken prior to specimen collection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

The benzodiazepines screen test is clinically significant for monitoring medication compliance in patients prescribed these controlled substances. It helps healthcare providers ensure patients are taking their medications as directed. The test is also valuable in emergency situations to identify potential benzodiazepine overdose, which can cause severe sedation, respiratory depression, and in extreme cases, coma or death. Additionally, this test may be used in substance abuse evaluation programs and can help detect drug interactions or verify drug history in patients undergoing surgery or treatment for other conditions.

Frequently asked questions

Do I need to fast before this test?
Typically, no fasting is required for this blood test. However, always follow any specific instructions provided by your healthcare provider.
How long do benzodiazepines stay in your blood?
The detection window varies depending on the specific benzodiazepine, dosage, and individual factors like metabolism. Generally, most benzodiazepines can be detected in blood for several days to a couple of weeks after use.
Will a positive result show which specific benzodiazepine I took?
This depends on the testing method used. Some screening tests only indicate the presence of the drug class, while more advanced confirmatory tests can identify the specific benzodiazepine compound.
Can my prescription benzodiazepine cause a positive result?
Yes, if you are taking a legitimately prescribed benzodiazepine, it will likely cause a positive result. Always inform your doctor and testing facility about all medications you are taking, including prescriptions, over-the-counter drugs, and supplements.
Is this test the same as a drug test for employment?
This test is similar in concept to employment drug screens but is performed on blood rather than urine. It may be part of a broader panel depending on the clinical situation.
  1. 1
  2. 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.

Medical Disclaimer

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