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81770M
CARBAMAZEPINE, TOTAL AND FREE, SERUM

Test Code 81770M 
Test CARBAMAZEPINE, TOTAL AND FREE, SERUM 
Methodology Membrane Separation/Immunoassay
Immunoassay 
Description Useful for monitoring carbamazepine therapy in uremic patients 
Specimen Draw blood in a plain, red-top tube. Spin down and send 3.0 mL (minimum: 2.0 mL) of serum refrigerated in a screw-capped, plastic vial. 
Reference Values TOTAL
Therapeutic concentration: 4.0-12.0 mcg/mL
Toxic concentration: > or =15.0 mcg/mL

FREE
Therapeutic concentration: 1.0-3.0 mcg/mL
Toxic concentration: > or =4.0 mcg/mL 
Analytic Time 1 Day 
Day(s) Test Set Up Monday through Sunday 
CPT Code(s) 80156  Carbamazepine, total
80157  Carbamazepine, free