The Importance of Thyroid Testing

Tests like TSH, thyroid stimulating hormone, are the only two tests to determine when intervention with thyroid medication is recommended. But there are other tests that you can look at to assess thyroid physiology and they're available at every lab. There's reverse T3, which is a deactivated form of T4; then there's T3 uptake, which is kind of a proxy of how much thyroid hormone is stuck on the binding molecule.