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Increased PT: Vitamin K deficiency, warfarin use, liver disease. International normalized ratio (INR) PT ratio that would be obtained if WHO’s thromboplastin has been used. INR of 1 is normal; 2-3 therapeutic; 2.5-3.5 for valves. Partial thromboplastin time (PTT) Affected by intrinsic (and common) pathways. PTT >8-10 seconds above normal is ... ................
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