Carbamazepine, Free, Serum or Plasma

CPT: 80157
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Test Details


  • Carbatrol®
  • Epitol®
  • Equetro®
  • Free Carbamazepine
  • Tegretol®


Ultrafiltrate assayed by immunoassay

Reference Interval

Therapeutic: 0.6−4.2 μg/mL

Specimen Requirements


Serum or plasma


3 mL

Minimum Volume

1 mL


Red-top tube or green-top (heparin) tube. Do not use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.


Transfer separated serum or plasma to a plastic transport tube. Draw just prior to next dose.

Storage Instructions

Room temperature

Stability Requirements



Room temperature

14 days


14 days


14 days

Freeze/thaw cycles

Stable x3

Causes for Rejection

Gel-barrier tube


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
070748 Carbamazepine, Free, Serum 3433-0 070748 Carbamazepine, Free, Serum ug/mL 3433-0

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