While it is common for doctors to only run TSH and T4 tests when testing thyroid function, this is far from the full picture. In fact, thyroid function is best understood through a complete thyroid panel, which includes tests for TSH, T4, T3, Free T4, Free T3, Reverse T3, thyroid antibodies, and thyroid peroxidase. However, many insurance companies will not cover a complete thyroid panel, and as a result, doctors only order the two tests that are covered. This can lead to an incomplete understan

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