Abbrev Code:XMISC   
Order Code:LAB4909Order Name:Mephobarbital
Methodology:Liquid chromatography/Tandem mass spectrometry
CPT Codes: 80345 x1
Turnaround Time:Specimens are sent to reference laboratory Mon-Fri; results are reported within 3 days.
Special Instructions:Rapidly metabolized to phenobarbital; therefore, routine requests will be quantitated as phenobarbital only. Contact the laboratory if a separate mephobarbital result is needed.

Collection Instructions

Optimal Volume:4 mL
Minimum\Peds Volume:1.2 mL
Container:Red (no gel)
Alternate Containers: Green (lithium heparin, no gel), Green (sodium heparin, no gel)
Collection Instructions:Usual sampling time is immediately prior to next dose (trough).

Processing and Shipping

Specimen Processing:Centrifuge and aliquot 2 mL, 0.6 mL minimum. Store at room temperature.
Shipping Instructions:Ship at room temperature. For storage beyond three days, specimen should be refrigerated or frozen.
Test Performed at or Referral Lab Lab Sendouts  (MedTox)
Referral Lab number:69


Critical Range:20 ug/mL or greater
Reference Range:0.8-2.0 ug/mL Expected mephobarbital concentrations are 0.8-2.0 ug/mL or 2-5% of the phenobarbital (metabolite) concentrations.
Use:Therapeutic monitoring and assess toxicity.

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