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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 and T4 should be in the middle of your lab's reference range and your thyroid antibodies should be negative. It's very challenging to lower your body fat if you have an undiagnosed case of hypothyroidism.