Phenytoin, free

Alphabetical Test listing

Phenytoin, free-1993

Test name:

Phenytoin, free

Test number:

1993

Excellian order number:

80186.0

Abbreviation:

PNF

Alternate names:

Cerebyx
DPH
Fosphenytoin
PHT
PNF
Unbound Dilantin

Useful for:

Fosphenytoin is ProDrug of Phenytoin and is measured as Phenytoin

Specimen type:

Serum

Collection container:

Gold serum separator (SST) tube

Volume:

2.0 mL

Minimum volume:

0.5 mL

Collection instructions:

Specimen should be collected:

Peak (regular release): 1-3 hours post dose
Peak (slow release): 4-12 hours post dose
Trough: Immediately prior to next dose

Processing instructions:

Spin

Transport container:

Gold serum separator (SST) tube

Alternate specimen type:

Lithium heparin (Li hep) plasma

Alternate collection container:

Lt green plasma separator (PST)

Alternate processing instructions:

Spin

Alternate transport container:

Lt green plasma separator (PST)

Transport and stability:

Refrigerated (preferred) - 7 days

Ambient - 2 days

Frozen - 5 months

Reason for rejection:

Improper labels (unlabeled or mislabeled)
Hemolysis (some procedures)
Improper anticoagulant or ratio
Delay in transport
Improper storage temperature affecting results
Inappropriate timing of collection
Improper container
Leaking container resulting in compromised specimen
Quantity not sufficient (QNS)

Performing lab:

AHL - Chemistry: C

Days set up:

Daily

TAT:

1 day

Method:

Chemiluminescent Micro-particle Immunoassay (CMIA)

Reference ranges:

1.2 - 2.5 µg/mL

Results that require action (critical):

> 3.0 µg/mL

CPT codes:

80186

Date created:

11/30/2001

Revised date:

02/12/2020

Review date:

02/10/2020