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I'm hypothyroid. The only blood test that can be done for your thyroid is TSH. The higher the TSH levels, the less active your thyroid actually is. TSH tests measure the amount of TSH (thyroid stimulating hormone) your hypothalamus sends out to the thyroid to get it to create more hormones to regulate your metabolism and body functions. I was diagnosed hypothyroid last August and since then, regardless of the dosage of levothyroixine, it'll dip initially back into a normal range, then skyrocket again.

TSH is the only test you can get done without seeing a specialist. A high level of TSH means that you're hypOthyroid and that your hypothalamus (which is in control of your thyroid) is working overtime to tell the thyroid, "You're not producing enough hormone! Do more!" that's why its called Thyroid Stimulating Hormone. The higher your TSH level is, the less active your thyroid is. When your TSH levels are very low, then you're hypERthyroid.

And I know its not the only test, but seeing as I haven't yet been to an endrocrinologist (because I have no insurance) its the only test my campus doctor can run to check my thyroid.