I attend very often for my INR doing- sometimes its the following week, sometimes its a bit longer, like 3/4 wks, its because im on pills for epilepsy also- so its up& down like a fiddler's elbow!(once was there xmas eve,then back NYE, only 2 of us in clinic) But as clinic nurse pointed out, at least im already on blood thinners (will be for life) so if there was any clot risk, im protected already.made me feel less worried.She also told me to get INR reading done before i had jab, which i did, (i rang & they said come in, just 2days before jab!) so felt was more safe.