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	Document Title
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 - 21 Jun 2025