IDK but according to wiki, TT works by adding anticoagulant to blood and then adding a ton of thrombin to measure time of clot formation. I think it measures fibrinogen/fibrin activity. X is upstream of this so maybe that's why it doesnt matter
Yeah, correct, this was my thought. Intrinsic and extrinsic come together to form "X + V", and then it moves downwards to prothrombin -> thrombin, fibrinogen -> fibrin
Everything before X in the intrinsic (PTT) and extrinsic (PT) will be prolonged/"backed up".
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