I am a gadget person, using alivecor and coaguchek to keep tabs on my AF. I am not obsessive and rarely use alivecor unless I feel a different beat and like to know I can record it (probably about once a month).
Last night I was doing my fortnightly INR check and it was 4. This is very high for me and as the drop of blood I used was tiny I decided to repeat the test. So another finger and a good stab (ow) produced a good big drop of blood and this time INR 2.5.
Now, was the first sample too small or is machine faulty?? Any ideas??
Thanks in advance.