What tests do you need to have done to figure out if you have hypo or hyperthyroidism?

Lab tests: The common tests for both condition are: TSH and free t4. For hyperthyrodism, you will also need a free t3 (liothyronine). Once your doctor has these results, more tests might be needed such as thyroid antibodies, thyroid ultrasound, thyroid uptake and scan and possibly thyroid biopsy. The latter tests are usually not needed if tsh, free T4 and free T3 (liothyronine) are normal.

Basic labs: The quickest and best overall test to diagnose hyper or hypothyroidism is the thyroid stimulating hormone or TSH test. A low value means hyperthyroidism and a high value means hypothyroidism. Usually an additional measurement of t4, a free thyroid hormone, will be done as well.