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MEPHO / MEPHS-M
MEPHOBARBITAL AND PHENOBARBITAL

Test Code MEPHO / MEPHS-M 
Test MEPHOBARBITAL and PHENOBARBITAL 
Methodology Gas Chromatography-Mass Spectrometry (GC-MS) 
Description Includes phenobarbital determination by immunoassay.

Useful for optimizing drug dosage, assessing possible toxicity, and monitoring compliance 

Specimen Draw blood in a plain red-top tube. (SERUM GEL TUBE IS NOT ACCEPTABLE). Spin down and send 5.0 mL (minimum: 1.5 mL) of serum refrigerated. 
Reference Values MEPHOBARBITAL
Therapeutic concentration: 1.0 - 7.0 g/mL
Toxic concentration: >= 15.0 g/mL

PHENOBARBITAL
Therapeutic concentration
Infants and children: 15 - 30 g/mL
Adults: 20 - 40 g/mL
Toxic concentration: >= 60 g/mL 

Analytic Time 1 Day 
Day(s) Test Set Up Monday through Friday 
CPT Code(s) 80184  assay of phenobarbital
80345  assay of mephobarbital
G0480 or  G0481 or G0482 or G0483, Drug test(s), definitive (Government payers, if appropriate), if indicated