Doctor At Home

I know a boy who has a heart problem. He goes to see the heart doctor twice a year and every visit they do an ecg. I was thinking how much would really cost for him to just buy the machine and do them at home himself. I did find a machine online that would not be so expensive compared to the cost of the visit but even if you can get the reading you need to have a doctor read the results. Of course this is what makes the cost of a visit so much higher. So I think even though it would be cool to get a machine to get it read properly you need to visit the doctor.