Phenobarbital to MedTox - LG4895

Sunquest Code:LSMISC  
Epic Code:LAB4909Epic Name:Send Outs Misc Tests
CPT Code:80184
Turnaround Time:Specimens are sent to reference laboratory Mon-Fri; results are reported within 1-2 days.
Special Instructions:After hours stat specimens are sent to the reference laboratory 24 hours/day. Additional fees will apply.

Collection Instructions

Optimal Volume:2 mL
Minimum\Peds Volume:1 mL
Container:Red (no gel) (Green (lithium heparin, no gel), Green (sodium heparin, no gel))
Collection Instructions:Trough level is preferred; collect immediately before dose. It is advisable to monitor at the same time in the dosing schedule.
Causes for Rejection:Results may be altered if collected in a gel tube.

Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1 mL, 0.8 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Lab Sendouts  (MedTox)


Critical Range:Greater than 50 mg/L
Therapeutic Range:15-40 mg/L
Use:Monitor therapeutic drug level of Phenobarbital; use with Primidone levels to monitor therapeutic drug level of Primidone; evaluate Phenobarbital toxicity. Half-life is 50-120 h (adult) and 40-70 h (child).

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