Chlorpromazine Level

Thorazine, Ormazine, Largactil

Test Codes

EPIC: LAB1231984, Beaker: XCPL, Quest: 882

Department

Send Outs

Specimen Collection Criteria

Collect (preferred specimen): One plain Red-top tube.
Also acceptable: One Lavender-top EDTA tube.

Do not use Serum Separator Tubes.

Physician Office/Draw Specimen Preparation

Let specimen clot 30-60 minutes then centrifuge to separate serum or plasma from cells. Transfer serum to plastic transport tube and maintain at room temperature (20-26°C or 68-78.8°F) prior to transport.

Preparation for Courier Transport

Transport: 3.0 mL serum or plasma, room temperature (20-26°C or 68-78.8°F). (Minimum: 1.2 mL)

Rejection Criteria

• Serum Separator (SST) Tube.
• Whole blood
• Specimens not collected and processed as indicated.

In-Lab Processing

Let specimen clot 30-60 minutes then centrifuge to separate serum or plasma from cells. Transfer serum to plastic transport tube and maintain at room temperature (20-26°C or 68-78.8°F) prior to transport.

Transport: 3.0 mL serum or plasma, room temperature (20-26°C or 68-78.8°F). (Minimum: 1.2 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 7 days
Refrigerated (2-8°C or 36-46°F): 14 days
Frozen (-20°C/-4°F or below): 1 year

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Quest Diagnostics, Wood Dale, IL.

Performed

Varies.
Results available within 8-16 days.

Reference Range

See report.

Test Methodology

Gas Chromatography (GC).

Interpretation

By report.

Clinical Utility

Chlorpromazine – Chlorpromazine is a phenothiazine for treating psychosis and Tourett's syndrome. Monitoring its level is important to optimize therapy, to avoid toxicity, and to assure compliance.

CPT Codes

80299
LOINC:  3471-0

Contacts

Last Updated

11/19/2025