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Methodology: Spectrophotometry (S)
Edit Date: 4/11/2005
Performed: Monday, Thursday
Released: 1-5 days after setup at PeaceHealth Laboratories’ reference lab.
CPT Code: 80299-90
Specimen Collection Details
Collection: One 4 mL red top tube. Also acceptable: Green top tube (heparin) or lavender top tube (EDTA).
Handling: Allow to clot, centrifuge and separate serum or plasma from cells and pour into a plastic vial.
Stability: 7 days ambient, 7 days refrigerated, or frozen indefinitely.
Standard Volume: 2 mL serum or plasma.
Minimum Volume: 1 mL serum or plasma.
Transport: Refrigerated.
Rejection Criteria:
This test may require insurance company prior authorization before ordering.
Please check the prior authorization list
Failure to gain preauthorization may result in denial of coverage.

Reference Range:
10-50 mg/dL
Sedation (values >50 mg/dL may be associated with mild toxicity).
75-150 mg/dL
Epilepsy seizure control (many patients will exhibit toxic symptoms within this range).
>150 mg/dL
May be associated with debilitating toxicity.
>300 mg/dL
May be fatal.

PeaceHealth Laboratories