I was diagnosed with APS in 2007 following 3 DVTs and a bilateral pulmonary embolism. I dutifully joined the queue every week at the anticoagulation clinic where I had my finger-prick test onto the Coagucheck XS machine and prescribed my dose of Warfarin for the week. My INR range is between 3-4.
Shortly afterwards I decided to purchase my own machine and self-tested at home. This was combined with a quarterly check-up with my haematologist at a private hospital. At such a review, he perform his own INR test using a venous sample: the results were massively different! Consequently, I then went to my general hospital armed with my machine and asked them take a venous sample and place a drop of blood onto the strip and the rest into the bottle for later testing by the lab. Again, the readings were massively different! I performed the same test again and also included (on the same day) a visit to the private hospital:all 3 reading were different by a considerable margin!
I later raised this importatnt issue not only with the manufacturers of the machine but also with the NHS and the private hospital coupled with a scientist specialising in the field.
To cut a very long story short, I now ONLY go to my local general hospital as I was advised that their labs and process come under massive scrutiny and are regulalry checked to ensure that they comply with all the relevant rules and regulations.
As a matter of interest, has anybody, reading this blog, self-tested and then been venous sampled only to find significantly varying results?
Thanks for reading