Clonazepam in Serum (Quantitative)
This test measures the amount of clonazepam, a benzodiazepine medication, in your blood serum. It helps assess drug levels for monitoring treatment effectiveness or detecting overdose.
["This test helps doctors check if your clonazepam dose is working as intended or if you may be at risk of toxicity."]
Key facts at a glance
- LOINC
- 73435-0
- Short code
- clonazePAM ind plt IgM SerPl Ql FC
- Synonyms
- clonazePAM ind plt IgM SerPl Ql FC
- Category
- hematology
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- flow-cytometry
- CPT
- 82784
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may order this test if you’re taking clonazepam for conditions like anxiety, seizures, or insomnia. It may also be done to check for drug levels in cases of suspected overdose, improper dosing, or to monitor long-term use. Rarely, it could be part of a broader drug screening if you’re under suspicion for substance use.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw blood. The process takes about 5 minutes, and you may feel a brief pinch. If you’re on blood thinners, let your provider know before the test.
What the Results Mean
Results are typically reported in micrograms per milliliter (mcg/mL). While reference ranges vary by lab and patient factors, very high levels may indicate overdose or improper use, while very low levels could suggest insufficient medication. Your doctor will interpret the results in the context of your medical history and symptoms.
Common Reasons for Testing
This test is most commonly used to verify therapeutic drug levels, especially in patients who take clonazepam regularly. It may also be used in emergency settings to assess poisoning or to confirm compliance with prescribed doses.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clonazepam is a central nervous system depressant, and its levels can affect how your body responds to it. Therapeutic levels (typically between 10–40 mcg/mL) are usually safe for most patients, but levels above 100 mcg/mL may cause severe sedation, respiratory depression, or coma. Very low levels may indicate poor absorption or drug interactions, requiring dose adjustments. Always follow your doctor’s guidance on medication management.
Short name
Clonazepam Level
Frequently asked questions
Will this test affect my medication?
How soon will I get my results?
Can I stop taking clonazepam if my levels are low?
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