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Chlordiazepoxide concentration in serum/plasma (pharmacokinetic measurement)

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

This test measures the amount of chlordiazepoxide, a benzodiazepine medication, in your blood. It helps assess how your body is processing the drug over time.

Quick summary

["This test helps doctors monitor drug levels for safety and effectiveness."]

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

Key facts at a glance

LOINC
73456-6
Short code
Chlordiazep ind plt IgM SerPl Ql FC
Synonyms
Chlordiazep 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 Might Be Ordered

Your healthcare provider may order this test if you’re taking chlordiazepoxide (e.g., Librium) for anxiety, seizures, or sleep issues. It may also be done to check for drug levels 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 needed, but you may need to fast for 8–12 hours before the test if your blood is drawn in the morning. Wear a loose shirt for easy access to your arm.

What Happens During the Test

A healthcare professional will draw blood from a vein in your arm. This process is quick and usually doesn’t cause discomfort. You may feel a slight pinch, but it’s over quickly.

What the Results Mean

Results show your current blood level of chlordiazepoxide. High levels may indicate overdose or improper metabolism, while low levels could suggest insufficient medication. Your doctor will interpret these results in the context of your treatment plan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Chlordiazepoxide Level

Frequently asked questions

How is this test used in clinical practice?
This test helps ensure safe and effective benzodiazepine dosing by monitoring drug levels. It’s particularly important for patients on long-term therapy, those with liver issues (since chlordiazepoxide is metabolized in the liver), or those at risk for overdose. Abnormal levels may prompt dose adjustments or further evaluation for drug interactions.
What does a high or low result typically indicate?
High levels may signal toxicity (e.g., drowsiness, confusion, or respiratory depression) or improper dosing. Low levels could mean the medication isn’t working as intended or you’re metabolizing it too quickly. Your doctor will discuss these findings with you.
Can diet or other medications affect this test?
Yes. Certain foods, liver diseases, or other drugs (e.g., alcohol, other sedatives) can alter how your body processes chlordiazepoxide. Always inform your healthcare provider about all medications, supplements, and recent dietary changes.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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