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Trazodone Level

Desyrel, Trazodone

Test Codes

Antrim #17061, EPIC: LAB5427, SOFT: TRAZO

Department

Toxicology

Specimen Collection Criteria

Collect: One plain Red-top tube. (Minimum Whole Blood: 2.0 mL)

Do not use Serum Separator Tubes.
Time of Collection: Trough, just prior to the next dose.
Record the exact time of specimen collection on the tube or in the computer system.

Physician Office/Draw Specimen Preparation

Let specimens clot 30-60 minutes. Centrifuge specimen to separate serum from cells. Refrigerate (2-8°C or 36-46°F) the centrifuged collection tube within two hours of collection. (Minimum: 0.5 mL serum)

Preparation for Courier Transport

Transport: Centrifuged collection tube, refrigerated (2-8°C or 36-46°F). (Minimum: 0.5 mL serum)

Rejection Criteria

• Serum Separator (SST) tubes.
• Severely lipemic or hemolyzed specimens.   

In-Lab Processing

Let specimens clot 30-60 minutes. Centrifuge specimen to separate serum from cells. Deliver immediately to the appropriate testing station.

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 24 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 3 months

Specimen Storage in Department Prior to Disposal:

Frozen (-20°C/-4°F or below): 2 months

Laboratory

Royal Oak Toxicology Laboratory

Performed

Tuesday, Wednesday, Friday.
Results available the same day as testing performed (1-4 days).

Reference Range

Therapeutic: 0.5-2.0 mcg/mL.
Critical Value: Greater than 5.0 mcg/mL.

Test Methodology

Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

This test was developed and its performance characteristics determined by Beaumont Health. It has not been cleared or approved by the FDA. The Laboratory is regulated under CLIA as qualified to perform high-complexity testing. This test is used for clinical purposes and should not be regarded as investigational or for research.

Interpretation

This assay measures Trazodone concentrations in serum. Trazodone is metabolized to an active metabolite, m-chlorophenylpiperazine (m-CPP), which is not measured. Trazodone concentrations have been shown to average ten times that of m-CPP.

Clinical Utility

Trazodone is indicated for the treatment of depression. This assay is used for the therapeutic monitoring and toxicity assessment of trazodone.

CPT Codes

80338 (alternate: G0480).
LOINC: 4064-2

Contacts

Last Updated

1/17/2023