Baclofen, Serum or Plasma

CPT: 80369
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Test Details


  • Gablofen®
  • Kemstro®
  • Lioresal®


Therapeutic drug management


Liquid chromatography/tandem mass spectrometry (LC/MS-MS)

Reference Interval

100−400 ng/mL

Specimen Requirements


Serum or plasma


2 mL

Minimum Volume

0.5 mL


Red-top tube or green-top (heparin) tube. Gel-barrier tubes are not recommended.

Patient Preparation

Trough levels are most reproducible.


Serum or plasma should be separated from cells within two hours of venipuncture. Submit serum or plasma in a plastic transport tube.

Storage Instructions

Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen. Specimen is stable for one day at room temperature, for seven days refrigerated, and for one year frozen.

Causes for Rejection

Gel-barrier tubes


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
808300 Baclofen (Lioresal) 808301 Baclofen (Lioresal) ng/mL 9353-4
808300 Baclofen (Lioresal) 808302 Baclofen (Lioresal) N/A

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