Update Type: Test Resumed
Test Updated: 12/07/2022
Test Overview
Test Methodology

Gas Chromatography/Flame Ionization Detection (GC-FID)

Test Usage

Therapeutic drug monitoring.

Reference Range *

10 - 40 mcg/mL. Critical Value: 55 mcg/mL.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Daily
Analytic Time

5 - 7 days

Soft Order Code
MSX
MiChart Code
Methsuximide
Synonyms
  • Celontin
  • Desmethylmethsuximide
  • MSX
Laboratory
Sendout
Reference Laboratory
Mayo FMETX (91822) (MedTox 78)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect blood in red or green top tube; do not use SST or PST tube. Centrifuge, aliquot serum or plasma into a plastic vial and refrigerate or freeze.

Normal Volume
2 mL serum or plasma
Minimum Volume
0.3 mL serum or plasma
Storage Temperature
Refrigerated preferred, frozen acceptable
Rejection Criteria
SST or PST tube not acceptable.
Additional Information

Test sent to Mayo Medical Laboratories; performed by MedTox Laboratories.

Billing
CPT Code
80339
Fee Code
20413