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Beaumont Laboratory


Mellaril®, NMS #4461SP, Order as a Miscellaneous Sendout.

Specimen Collection Criteria

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

Do not use Serum Separator Tubes.
Time of Collection: Trough, just prior to the next dose.

Physician Office/Drawsite Specimen Preparation

Centrifuge to separate serum or plasma from cells. Transfer serum or plasma to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Preparation for Courier Transport

Transport: 2.0 mL serum or plasma, refrigerated (2-8°C or 36-46°F). (Min: 0.7 mL)

Rejection Criteria

  • Serum Separator (SST) tubes.
  • Specimens not collected and processed as indicated.


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 8 days
Refrigerated (2-8°C or 36-46°F): 8 days
Frozen (-20°C/-4°F or below): 12 months

Specimen Storage in Department Prior to Disposal:

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


Sent to ARUP Laboratories, Salt Lake City, UT, forwarded to National Medical Services (NMS), Willow Grove, PA.


Tuesday, Thursday.
Results available in 4-10 days.

Reference Range

By report.

Test Methodology

Gas Chromatography.


Chronic high therapeutic concentrations for total drug may reach 7 mcg/mL. Toxic range is not well defined. Some patients may show toxicity at therapeutic concentrations.

Clinical Utility

Thioridazine is indicated for the management of manifestations of psychotic disorders. This assay is used to monitor the therapeutic drug level and to evaluate toxicity of thioridazine.

CPT Code


Test Codes

NMS #4461SP, Order as a Miscellaneous Sendout.

Last Updated


Microtainer® and Vacutainer® are registered trademarks of Becton, Dickinson and Company.
UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.

This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.