Intrinsic Factors, APTT
24 hours
Mechanical: Viscosity Based Detection
Causes for Rejection: Gross Haemolysis, clotted specimen, frozen specimen thawed in transit, tube <90% full, improper labelling, specimen collected in tube other than 3.2% citrate, refrigerated specimen
Accredited NRL Laboratory
Daily
Evaluates the intrinsic and common coagulation pathways. Commonly used to monitor heparin therapy or screen for clotting disorders.
Whole Blood or Plasma
90% full draw Plasma: 1 mL
Blue top (sodium citrate) tube
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Room temperature | Whole blood/ Plasma: 4 hours |
| Frozen | Plasma: 7 days |