Laboratory Medicine
Test catalogue
Protein S Antigen, Free | |
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Test NameProtein S Antigen, Free |
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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. 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. Must specify Heparin therapy. Haematology consult is REQUIRED for in-patient samples. Please call Special Coagulation at ext 5123 or the Haematologist on call 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 posible. Specimens that cannot be tested within the suitable timeframe (within 2hrs of Collection) are to be double-spun and send frozen Laboratory Staff Instructions: Centrifuge the blood sample at 4000 RPM (1500 G) for 15 minutes at room temperature (18-24˚C). Transfer the plasma fraction into a clean 10.0 mL plastic, conical tube. Re-centrifuge the plasma at 1500g for 5 minutes at room temperature (18 - 24˚C). Seperate and store plasma frozen at -70˚C, if testing cannot be performed within 2 hours 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 Haematology requisition required. |
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Turnaround Time (TAT)7 days |
Test Utilization>7 Days |
Reference ValueMale = 0.60 – 1.28 U/mL Female = 0.50 – 1.22 U/mL |
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Test CodePSAGF |
MethodologyChromogenic Immunoassay |
Testing LocationSMH-Special Coagulation |
Other information
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