Thiopental and Pentobarbital, Serum or Plasma

CPT: 80345
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Test Details


  • Pentothal®


Therapeutic drug management


Gas chromatography/flame ionization detection (GC/FID); gas chromatography/nitrogen phosphorus detection (GC/NPD)

Reference Interval

Thiopental: 4.0−60.0 µg/mL; pentobarbital: 1.0−5.0 µg/mL

Specimen Requirements


Serum or plasma


3 mL

Minimum Volume

0.6 mL


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


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.

Causes for Rejection

Gel-barrier tubes


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
811158 Thiopental and Metabolite 811159 Thiopental (Pentothal Sodium) ug/ml 4050-1
811158 Thiopental and Metabolite 811160 Pentobarbital (Nembutal) ug/ml 3924-8

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