5184: PHENYTOIN, FREE, SERUM
- Plain Red Top Tube, Transfer Tube- Serum, Green Top Tube, Transfer Tube- Plasma
Turn Around Time
- Red-top tube or green-top (heparin) tube. Do not use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.
Transfer separated serum or plasma to a plastic transport tube and indicate sample type.
Draw specimen just prior to next dose.
- 14 days Room temp, 14 days Refrigerated, 14 days Frozen