PARTIAL THROMBOPLASTIN TIME (PTT)
: aPTT, Activated Partial Thromboplastin Time, PTT
: 23-34 seconds
: Light blue top (Sodium Citrate)
: Citrated plasma - platelet poor
: Peds - 2.7 mL Neonates - 1.8 mL
: 1.0 mL plasma
: 1.0 mL plasma
: Room temperature, or send as a frozen plasma aliquot if sample will not be received into the lab within 2 hours
: Room temperature: 4 hours, if patient is on Heparin: 2 hours
Reasons for Rejection
: Clotted sample, incorrectly filled tube, sample sent as whole blood > 4 hours old..CLICK HERE FOR COAGULATION SPECIMEN COLLECTION GUIDE.
: 2 hours, once received into the lab
: Indwelling line should be flushed with saline and 5.0 mL of blood discarded before collecting samples for coagulation assays. Tube must be full and not clotted. Deliver to lab immediately. Samples received from an outside lab must be aliquoted and frozen. Samples aliquoted for shipping must be double centrifuged prior to freezing. Grossly hemolyzed, icteric or lipemic samples may be rejected.
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