Tissue Thromboplastin Inhibition
7 days
Clotting time is measured using a dilute prothrombin time (dPT) reagent consisting of a unique formulation of relipidated recombinant tissue factor and calcium.8 Samples with extended dPT are tested in a confirmatory assay including excess phospholipid. The sample is considered to be positive for lupus anticoagulant when the dPT ratio (ie, dPT:confirm) is >1.15.
Causes for Rejection Severe Haemolysis, improper labeling, clotted specimen, specimen diluted with IV fluids, samples thawed in transit, improper sample type, sample out of stability
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Assesses lupus anticoagulant. Helps identify antiphospholipid syndrome.
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.
Strictly frozen, requires own sample container
| Temperature | Period |
|---|---|
| Frozen | 28 days |
| Freeze/thaw cycles | Stable x3 |