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Phenytoin

Performing Lab(s)

Memorial-Belleville only

Specimen Requirement (s)

Specimen Type: Plasma

Container/Tube:   mint green LiHep Tube (preffered)

Specimen Volume:  1 mL

Specimen Minimum Volume:  0.5 mL plasma

 

Collection Instructions:

  • IV: 2-4 hours following completion of infusion loading dose.
  • Oral:
    • Peak - 3-9 hours following administration of drug.
    • Trough - Not more than 30 minutes before next dose.

 

Lab instructions: NA

Day(s)/Shift(s) Test Set Up and Turnaround Time

Sunday through Saturday

Hours: 24 hours

 

Turnaround Time:

STAT: 60 minutes

Routine: less than 8 hours from receipt.

Transport and Stability

Transport temperature: Ambient to lab

Reference Values

Phenytoin

Age

Reference Values

Critical High

0 – 3 months

10 – 20 mcg/mL

≥ 14 mcg/mL

>3 months

10 – 20 mcg/mL

≥ 29 mcg/mL

 

Note: Therapeutic or toxic effects of anticonvulsant drugs may occur at different concentrations in different patients, and the correlation between dose and clinical effect must be evaluated individually.

CPT/LOINC Codes

80185