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Mayo Clinic Laboratories

Test Code LAB31 PHENYTOIN TOTAL

Additional Codes

CPT Code: 80185

Performing Laboratory

Peninsula Regional Medical Center - Chemistry

Specimen Requirements

Submit only 1 of the following specimens:

 

Plasma

Draw blood in a green-top (lithium heparin) tube. (Hemolyzed specimen is not acceptable.) Spin down and send 2 mL of lithium heparin plasma.

Note: 1. Indicate plasma.

2. Label specimen appropriately (plasma).

 

Serum

Draw blood in a gold-top serum gel tube. (Hemolyzed specimen is not acceptable.) Spin down and send 2 mL of serum.

Note: 1. Indicate serum.

2. Label specimen appropriately (serum).

Reference Values

Therapeutic concentration: 10-20 mcg/mL

Critical value (automatic call-back): >25 mcg/mL

Additional Information

Available STAT