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Test Code FQUET Quetiapine (Seroquel)

Reporting Name

Quetiapine (Seroquel), Serum

Method Name

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

Performing Laboratory

Medtox Laboratories, Inc.

Specimen Type


Specimen Required

Submit only 1 of the following specimens:



Draw blood in a green-top (sodium heparin) tube(s), plasma gel tube not acceptable. Spin down and send 3 mL sodium heparin plasma refrigerated in a plastic vial.



Draw blood in a plain red-top tube(s), serum gel tube is not acceptable. Spin down and send 3 mL of serum refrigerated in a plastic vial.

Specimen Minimum Volume

0.6 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Refrigerated (preferred) 14 days
  Frozen  180 days
  Ambient  72 hours

Reject Due To

Hemolysis NA
Lipemia NA
Icterus NA
Other NA

Reference Values

Units:    ng/mL


Therapeutic and toxic ranges have not been established. Expected steady-state Quetiapine plasma levels in patients receiving recommended daily dosages: 100 - 1000 ng/mL.


Day(s) and Time(s) Performed

Monday through Sunday

Test Classification

This test was developed and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FQUET Quetiapine (Seroquel), Serum 26776-5


Result ID Test Result Name Result LOINC Value
Z1216 Quetiapine (Seroquel), Serum 26776-5