I'm not sure if I have a thyroid problem or not but I have a lot of symptoms of low thyroid. I have been taking the home test with the thermometer in my armpit for the last 3 days. The readings have been 97.3, 96.1 & 96.6. I will continue to do it for a week. I use a digital thermometer and after researching thyroid problems online I found a site that said you should only use the old type thermometer not the digital so that you can leave it in place for 15 minutes. Anyone have opinions on this?