Warfarin INR levels begin to drop between 3 days to 5 days after ceasing it. The hospitals advice is perfectly fine. Your INR levels should drop to under 2 for the procedure. Ensure you ask your doctor when to start it back up. ie night of the procedure (if bleeding isnt an issue) or start taking it again the following night after the procedure.
You should probably get yourself tested a week after restarting. It should be back to your normal level by then but you'll want to know that for reassurance.
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