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In addition to an increase level of TSH above 2.5 mU/L during the first trimester, and above 3 mU/L in the second and third trimester, a decrease fT4 concentration (also using reference range for pregnant women) will help clinicians diagnose overt hypothyroidism during pregnancy.
T3 Results. T3 tests, which check for levels of triiodothyronine, are usually ordered if T4 tests and TSH tests suggest hyperthyroidism. The T3 test may also be ordered if you are showing signs of an overactive thyroid gland. The normal range for the T3 is 100-200 nanograms of hormone per deciliter of blood.