Days Set Up
Monday, Wednesday, Friday
Analytic Time

3 days

MiChart Code
Chlordiazepoxide (Librium), Level
Soft Order Code

Test Updated:



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Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Test Overview

Test Methodology

High Pressure Liquid Chromatography

Test Usage

Useful for optimizing dosage, monitoring compliance, or assessing toxicity.

Reference Range

Therapeutic Chlordiazepoxide: 100 - 3000 ng/ml; Norchlordiazepoxide: 100 - 1000 ng/ml; Toxic: >5000 ng/ml.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect blood in a red top tube; do not use SST tube. Centrifuge, aliquot serum into plastic vial and refrigerate. Protect specimen from light. Decomposition will occur if specimen is stored under fluorescent lights at room temperature for more than 1 day.

Yellow Top Tube
Red Top Tube
Normal Volume
1.0 ml serum
Minimum Volume
0.2 ml serum

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.