Chlordiazepoxide Concentration (Serum/Plasma)
This test measures the amount of chlordiazepoxide, a benzodiazepine medication, in your blood. It helps assess drug levels to ensure proper dosing and monitor for toxicity or effectiveness.
["This test helps doctors check if your medication levels are safe and working as intended."]
Key facts at a glance
- LOINC
- 73457-4
- Short code
- Chlordiazep ind plt IgG SerPl Ql FC
- Synonyms
- Chlordiazep ind plt IgG 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 chlordiazepoxide (e.g., Librium) for anxiety, seizures, or sedation. It’s also used in cases of suspected overdose or to adjust your dose based on how your body processes the medication.
What to Expect Before the Test
No special preparation is usually needed. You may have a small needle inserted into a vein (venipuncture) or a blood sample drawn from your arm. If you’re on blood thinners, let your provider know before the test.
How the Test Results Are Used
Results help determine if your medication levels are within a safe range. Too little may mean the drug isn’t working effectively, while too much could indicate overdose or side effects like drowsiness or confusion.
What the Results Mean
Interpretation depends on your specific situation, such as your dose, kidney function, and medical history. Your provider will discuss the results with you and adjust your treatment plan if needed.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Chlordiazepoxide is a long-acting benzodiazepine that can accumulate in the body over time, especially in patients with kidney issues. Regular monitoring helps prevent toxicity (e.g., excessive sedation, respiratory depression) or inadequate control of symptoms (e.g., anxiety, seizures). It’s particularly important in elderly patients, those with liver disease, or those taking other medications that interact with benzodiazepines.
Short name
Chlordiazepoxide Level
Frequently asked questions
How long does it take to get results from this test?
What are the normal ranges for this test?
Can I eat or drink before this blood test?
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