Phenytoin (Dilantin) | KK Women's and Children's Hospital

Specimen Container	Gel separator tube (Adult) Microtube (Paeds)
Specimen Requirement	Plain Blood Adult: 3 mL Paediatric: 1.3 mL
Specimen Storage/Transport	Spin down and separate serum. Sample should be kept refrigerated (2-8°C). Stability: 1 Month
Orderable as Urgent?	No
Turn Around Time	Average: 4 hrs ( 3 - 5 hrs )
Testing Laboratory Location	SGH
Laboratory	Biochemistry
Contact Number	6394 1352
Day and Time Performed	Daily, 24 hrs
Orderable on CPOE?	Yes
Downtime Form	Clinical Chemistry - Form A
Additional Information	Trough levels (just before next dose)should be monitored.For suspected toxicity, draw specimen 3-9 hrs after last dose (time depends on a total drug dose.)

Change History Notes

Last Updated - 24 Jul 2025