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CARBAMAZEPINE, serum (087-0384) Synonyms: Tegretol CPT 4 Code: 80156 Test Order Mnemonic: CARBAMAZE Lab Clinical Chemistry Request Form: Special Chemistry form 2 Collection: Routine venipuncture; draw trough levels immediately before next dose. Storage Instructions: Samples must be centrifuged within 4 hours of collection. Refrigerate serum at 2 - 8C. Causes for Rejection: Blood collected in a SST/gel barrier tube or any anticoagulated tube. Availability: Samples are received 24 hours per day. Turnaround Time: Routine: 24 hours; STAT: 1 hour Specimen: Blood Volume: 3 mL blood Minimum Volume: 0.5 mL serum Container: Red-topped tube. Do not collect in SST/serum separator tube. Reference Ranges: Therapeutic Range: 8-12 mcg/mL. Patients receiving carbamazepine together with other antiepileptic drugs may exhibit a therapeutic response between 4-8 mcg/mL. Critical Values: Potential toxicity: 12 mcg/mL. Toxicity for patients receiving carbamazepine concurrently with other antiepileptic drugs ranges from 9 to 12 mcg/mL. Test Method: Chemiluminescence Reviewed/revised April 2007 by P. Harris
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