Order Code: C2354
ABN Requirement: No
Synonyms: Dilantin; Diphenylhydantoin
Volume: 1.0 mL
Minimum Volume: 0.5 mL
Container: Gel-barrier tube (SST, Tiger Top)
- Collect and label sample according to standard protocols.
- Gently invert tube 10 times immediately after draw. DO NOT SHAKE.
- Allow blood to clot 30 minutes.
- Centrifuge at 1300 rcf for 10 minutes.
Special Instructions: Collect sample immediately prior to next dose. Record the time of the last dose of phenytoin on the requisition.
Transport: Store serum at 2°C to 8°C after collection and ship the same day per packaging instructions provided with the Cleveland HeartLab, Inc. shipping box.
Ambient (15-25°C): 48 hours
Refrigerated (2-8°C): 7 days
Frozen (-20°C): 30 days
Deep Frozen (-70°C): 30 days
Causes for Rejection: Specimens other than serum; improper labeling; samples not stored properly; samples older than stability limits
Methodology: Fluorescence Polarization Immunoassay (FPIA)
Turn Around Time: 4 days
Intended Use: A phenytoin test is performed to monitor the concentration of the drug in the blood.
Limitations: Falsely elevated results may occur if sample is not drawn at the specified time associated with the administration of this drug.
Additional Information: Small increases in drug dose can lead to large increases in blood concentrations due to the way in which the drug is metabolized within the body.