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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
APTTs stored as whole blood or as aliquoted plasma are stable for 4 hours at room temp (18-25)C.
APTTs stored as aliquoted plasma are stable for 3 months at -20C and 4 months at-70C.
APTTs used for monitoring unfractionated Heparin (Nurse PTT order at West Roxbury) are stable for 1 hour at room temp (18-25)C.
APTTs stored as aliquoted plasma are stable for 3 months at -20C and 4 months at-70C.
APTTs used for monitoring unfractionated Heparin (Nurse PTT order at West Roxbury) are stable for 1 hour at room temp (18-25)C.
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: April 29, 2026
