Those of you who are knowledgeable about warfarin/coumadin: when people first start taking this, how frequently does your health care system require blood tests? i'm starting coumadin literally today after doing a lot of research and consults. the treatment is managed by an anti-coagulant unit, labs and results and adjusting the dose. everything i learned about this spoke of weekly blood tests until the inr/ptt stabilized, then longer periods between. . NOW the anti-coag unit says testing is required 2x a week probably for months. Problem is, labwork requires a high copay each time. 8 x per month is unaffordable. So what is the protocol where people here get warfarin monitoring and dose adjustment -- in the beginning? many thanks to everyone here for sharing your knowledge and experience.