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Test Code CARB Carbamazepine, Total, Plasma or Serum

Additional Codes

LAB21

Important notes

Carbamazepine, Total, Plasma or Serum test is for medical use only.

Collection Method

Venous collection

Minimum Volume

0.5ml

Container

Lt Green / Plasma Separator / Lithium Heparin

Acceptable Specimens

Serum:

  • Gold Top SST
  • Red Top


Plasma:

  • Light Geen Top (lithium heparin)

Reference or Target Ranges

4-12 µg/mL

Peak: 4 - 8 hours post oral dose

Trough: Just prior to next dose

Reportable Units

 µg/mL

Critical Value

≥ 12 µg/mL

Reasons for Rejection

Hemolysis Threshold 1000 mg/dL
Icterus Threshold 50 mg/dL
Lipemia Threshold 2000 mg/dL
Other QNS, contaminated, improperly Labeled, improper specimen type

Specimen Stability

Ambient 2 days
Refrigerated (4°C to 8°C) 7 days
Frozen(-40°C to 0°C) 4 weeks

Performance Information

Days and Time Performed 24/7
Expected Turn Around Time Stat: 1 hour
Routine: 4 hours
Stat Availability Yes
Performing Bench CPH Chemistry
Methodology/Method Description Roche Cobas

CPT Codes

80156

Last review/edit date

2025