F5 and deep vein thrombosis: The incidence of Factor V Leiden is reported to be low in Indian patients with thrombosis, ranging from 3 to 4.1%.4,5 On the other hand, surprisingly, APC-R has been reported in 12.5 to 39.2% of Indian patients.2,3 In this study, APC-R was detected in 19% of the patients and 4% of the controls.