T3-T4 Testing versus TSH testing? |
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TSH is commonly accepted today as the first-line diagnostic test for overall thyroid function. In general, a normal TSH level (0.3-4.5) indicates normal thyroid function. If the TSH is high or low, then T4 and T3 (and their "free" forms, FT4 and FT3) are evaluated to narrow the diagnosis.
First answer by EarlH2O. Last edit by EarlH2O. Contributor trust: 7 [recommend contributor]. Question popularity: 11 [recommend question]
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