Test directory: Part. Throm. Time (PTT)

Ordering Code516
Test NamePart. Throm. Time (PTT)
AliasActivated Part. Thromboplastin Time
PTT Activated
Preferred SpecimenWhole Blood
Preferred ContainerCitrate, 3.2% (Lt Blue)
Other Specimen/ContainerPlasma in Citrate, 3.2% (Lt Blue)
Optimum VolumeWhole Blood: Entire tube
Plasma: 1.0 mL
Collection InstructionsDraw full tube
Mix tube well.
Handling InstructionsPTT may be affected by freezing. Optimal specimen is whole blood kept at room temperature
If sending plasma: Double centrifuge, separate, and freeze at -20 deg. C immediately. Do NOT thaw once specimen is frozen.
Transport RequirementsOn Oahu: Ambient if Whole Blood and testing is done
within 10 hours.
Airline: Frozen (Plasma)
Note: Send Frozen Plasma if testing will be done >10 hours
from collection.
Specimen StabilityAmbient: 10 hours (Unopened/Untested Master tube)
Ambient: 4 Hours (Aliquoted Plasma, Opened tube)
Refrigerated: Not Stable
Frozen: 2 weeks Plasma
Rejection CriteriaClotted, Contaminated, Hemolyzed, Overfilled tube, Specimen older than stability limits, Underfilled tube, Add-on to previously tested specimen >4 hours
Avail. StatYES
Analytic Time1 Day
MethodologyClot Detection

Reference range(s)

ComponentAgeMale NormMale Critical LowMale Critical HighFemale NormFemale Critical HighFemale Critical LowUnitsAdd'l info