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Phenytoin (Dilantin), Total, (PTN)

Specimen Container

Red

Specimen Collection Type

Serum

Minimum Volume To Collect (Ml)

1 mL

Pediatric Volume To Collect (Ml)

0.4 mL

Specimen Preparation

Separate < 4hrs

Stability

Ambient Stability: 48 hrs
Refrig Stability: 4 days
Frozen Stability: 1 Month

Unacceptable Conditions

Do not use separators or gels

Preferred Transportation Temperature

REFRIGERATED

Remarks

Samples should be drawn immediately before next oral dose
Samples from patients receiving fosphenytoin should be drawn at least 2 hours following IV administration per the recommendations of the manufacturer
The change in the phenytoin concentrations is dependent on the amount of time that has elapsed since the administration of fosphenytoin

Performed

Sun-Sat

Reported

Same day

Methodology

Chemiluminescent Microparticle Immunoassay (CMIA) and Enzyme Immunoassay

Lab Department

Core

Testing Location

IHC

Synonyms

Dilantin
Dilantin, Total
Phenytoin, Total, Serum
Total phenytoin

Test OR Panel

Test

Misc Instructions

Separate from cells within 4 hours of collection

Unit of Measurement

ug/mL

CPT Codes

80185

LOINC

3968-5

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