Laboratory Medicine
Test catalogue
Partial Thromboplastin Time, Activated (aPTT) | |
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Test namePartial Thromboplastin Time, Activated (aPTT) |
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Specimen Type / RequirementsContainer Type = Blue Minimum Testing Volume = 9:1 Ratio – Full Draw |
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Specimen HandlingCollection Instructions: Collect blood into blue top vacutainers which contain 3.2% buffered sodium citrate. Must indicate anticoagulant status to avoid delay. NOTE: The ratio of blood to anticoagulant is 9 parts blood to 1 part anticoagulant, therefore the blue top vacutainer (citrate) must be filled AT LEAST ¾ in total volume. Write your initials, date and time of collection on the collection label. Stability: Stable frozen at -20C for up to two weeks or -70C for up to six months. Transportation: Send sample to core lab as soon as possible. Specimens that cannot be tested within the suitable time frame (4hrs after Collection) are to be double-spun and send frozen. Laboratory Staff Instructions: Centrifuge the blood sample at 4000 RPM (1500 G) for 8 minutes at room temperature (18-24˚C) on the Haematology robotics line centrifuge. Sample Rejection Criteria:Clotted sample, Grossly hemolyzed samples, Unlabeled or Not Sufficient Quantity Samples will be rejected. |
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Required DocumentationRegular HIS order or Biochemistry requisition required. |
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Turnaround Time (TAT)STAT:45min, Routine:4hrs |
Test UtilizationRoutine |
Reference Value24.0 - 37.0 seconds Therapeutic range of heparin: 61.0 – 95.0 seconds |
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Test CodeRPTT |
MethodologyClot Based Assay |
Testing LocationSMH-Routine Coagulation |
Other InformationLast Updated: June 06, 2019
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