Here's a simple thyroid test (which I do regularly):

One way to do an evaluation of your thyroid status: go to the drug store and buy a bottle of ordinary liquid Iodine 2% (just like you’d put on a cut). Take a cotton swab or applicator and apply a patch of iodine to your skin; an area about as big as a silver dollar, on the abdomen, leg, or anywhere on the body.
Watch this area for the next 12 hours, every hour. If the brown iodine area is absorbed into your skin and disappears in less than 12 hours, it is very likely you are thyroid deficient.