I have to test my INR just about every week. I've only had my INRatio machine for a couple of months and even though you have to get the test strips, etc., it's well worth it. It's been so hot here in Florida recently (I know, it's been hot everywhere lately) and with the intensity of the sun, we tend to stay indoors to avoid the heat...just like we used to do in Nebraska and Maryland to avoid the cold and snow. Anyway, at three this afternoon, I remembered that I needed to test today and in the past I would have had to get out and go to the lab, wait, get a vein draw and then drive back home. I don't mind as much getting out in this heat if it's something that I WANT to do, but when you HAVE to go and do something that you don't want to do, then it's different. I tested at 3:15, called my results in to the nurse at my cardiologist's office and she called back with my coumadin dosage within 30 minutes. I'm blessed with the fact that the nurse always calls back within 30 minutes. And my two cardiologists and the nurses in the office couldn't be happier that I'm now testing at home!