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HelpTest Code PHNT Phenytoin
Specimen Requirements
Submit only one of the followings
Preferred
Specimen Type: Serum
Container/Tube: Gold Top (SSTII)
Volume: 5.0mL
Minimum Volume: 0.5mL serum
Collection Instructions: Allow specimen to clot for 30 minutes and centrifuge within 2 hours
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Acceptable
Specimen Type: Plasma
Container/Tube: Green Top (Li Heparin/PST)
Volume: 4.5mL
Minimum Volume: 0.5mL plasma
Collection Instructions: Centrifuge within 2 hours
Sample Stability
** Preferred temperatures for storage prior to and during shipping to NUH **
| Specimen Type: | Serum/Plasma |
|---|---|
| Ambient: | 2 days |
| Refrigerate: | 1 month |
| Frozen: | 5 months |
Reference Interval
| Therapeutic range | 10 – 20 mg/L |
|---|---|
| Critical | >20 mg/L |
Days and Times Performed
24 hours, TAT 1 day
Methodology
Particle-enhanced turbidimetric inhibition immunoassay (PETINIA)
Service Code
31822
Update
Last updated 26/02/2022
Unacceptable Condition
| Haemolysis | NA |
|---|---|
| Icterus | NA |
| Lipaemic | NA |
| Others | NA |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Therapeutic drug monitoring
Alias
Dilantin