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PTT SCREEN
Test CodePTT SCREEN
Alias/See Also
APTT
Partial Thromboplastin Time
Hematology
Partial Thromboplastin Time
Hematology
Preferred Specimen
Light Blue Top Tube – 3.2% sodium citrate
Transport Temperature
Best stored at room temp. Cold temps may lead to a gradual loss of VFW and Factor VIII activity. Do not transport directly on ice packs or on ice.
Specimen Stability
Whole blood, unopened tube, centrifuged or uncentrifuged
Non-heparinized patients
Room temperature: 4 hours
Patients for VWF or VIII analysis
Room temperature: 4 hours. Do not refrigerate or freeze.
Patients on unfractionated heparin
Centrifuge within 1hr of collection
Room temperature: 4 hours
Non-heparinized patients
Room temperature: 4 hours
Patients for VWF or VIII analysis
Room temperature: 4 hours. Do not refrigerate or freeze.
Patients on unfractionated heparin
Centrifuge within 1hr of collection
Room temperature: 4 hours
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Underdrawn or grossly hemolyzed specimens are not acceptable
Methodology
Photo-optical endpoint
Setup Schedule
Daily
Report Available
TAT 1 day
Reference Range
27.9 - 37.0 sec
Heparin therapeutic range: 55.0 – 94.0 sec
Heparin therapeutic range: 55.0 – 94.0 sec
Performing Laboratory
Test Performed in BACL Hematology Labs
Contact West Roxbury: Nolan Raymond 857-203-5980
Alternate Contact Joseph A. Manzone JP 857-364-5092
Alternate Contact Diane Robert Brockton 774-826-2294
Alternate Contact Bhumikaben Patel Bedford 781-687-2976
Last Updated: May 19, 2025
