|
|
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
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
Non-heparinized patients (or patients on heparin that is not unfractionated heparin)
Room temperature/Refrigerated: 6 hours
Patients on direct oral anticoagulants
Room temperature: 2 hours
Patients on unfractionated heparin – deliver to the laboratory ASAP
Room temperature: 1 hour
Aliquoted Plasma
Non-heparinized patients (or patients on heparin that is not unfractionated heparin)
Room temperature: 6 hours
Frozen: 3 months at -20C or 4 months at-70C.
Patients on direct oral anticoagulants
Room temperature: 2 hours
Patients on unfractionated heparin – deliver to the laboratory ASAP
Room temperature: 1 hour
Non-heparinized patients (or patients on heparin that is not unfractionated heparin)
Room temperature/Refrigerated: 6 hours
Patients on direct oral anticoagulants
Room temperature: 2 hours
Patients on unfractionated heparin – deliver to the laboratory ASAP
Room temperature: 1 hour
Aliquoted Plasma
Non-heparinized patients (or patients on heparin that is not unfractionated heparin)
Room temperature: 6 hours
Frozen: 3 months at -20C or 4 months at-70C.
Patients on direct oral anticoagulants
Room temperature: 2 hours
Patients on unfractionated heparin – deliver to the laboratory ASAP
Room temperature: 1 hour
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: September 19, 2025
