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25151 Quetiapine, Serum (423)

Quetiapine, Serum (423)
Test Code: QUETSO
Synonyms/Keywords

Seroquel®​

Quetiapine, Serum (423)

Useful For

​Therapeutic Drug Management

Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Serum​ ​Red Top Tube (RTT) ​ ​3 mL ​0.6 mL ​
​Plasma ​Lithium-heparin Green Top Tube or Sodium-heparin Green Top Tube (GTT) ​ ​3 mL ​0.6 mL ​
Collection Processing Instructions

​Gel-barrier tubes are not recommended.

Trough levels are most reproducible.

Specimen Stability Information
Specimen Type Temperature Time
​Serum or Plasma ​ Ambient  ​ 3 days​
Refrigerated​​14 days
​Frozen​6 months
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Monday through Saturday​ 5 days​
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS-MS)​
Reference Lab
Medtox Laboratories
Reference Range Information
Performing Location Reference Range
Medtox Laboratories​
Therapeutic and toxic ranges have not been established. Expected steady-state quetiapine plasma levels in patients receiving recommended daily dosages: 100 - 1000 ng/ml.​
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​80342
 ​ ​1 ​
 ​
​G0480 ​ ​1 ​ ​Medicare/MA
Synonyms/Keywords

Seroquel®​

Quetiapine, Serum (423)

Ordering Applications
Ordering Application Description
​COM ​Quetiapine, Serum (423)
​Cerner ​Quetiapine, Serum (423)
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Serum​ ​Red Top Tube (RTT) ​ ​3 mL ​0.6 mL ​
​Plasma ​Lithium-heparin Green Top Tube or Sodium-heparin Green Top Tube (GTT) ​ ​3 mL ​0.6 mL ​
Collection Processing

​Gel-barrier tubes are not recommended.

Trough levels are most reproducible.

Specimen Stability Information
Specimen Type Temperature Time
​Serum or Plasma ​ Ambient  ​ 3 days​
Refrigerated​​14 days
​Frozen​6 months
Useful For

​Therapeutic Drug Management

Reference Range Information
Performing Location Reference Range
Medtox Laboratories​
Therapeutic and toxic ranges have not been established. Expected steady-state quetiapine plasma levels in patients receiving recommended daily dosages: 100 - 1000 ng/ml.​
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Monday through Saturday​ 5 days​
Liquid Chromatography/Tandem Mass Spectrometry (LC/MS-MS)​
Reference Lab
Medtox Laboratories
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​80342
 ​ ​1 ​
 ​
​G0480 ​ ​1 ​ ​Medicare/MA
For most current information refer to the Marshfield Laboratory online reference manual.