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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.
Different normal TSH values are proposed for pregnancy. The range of serum TSH levels in the first trimester of pregnancy is 0.03 to 2.3 mIU/L; the upper limit of normal is 3.5 mIU/L in both the second and third trimesters of pregnancy.ifferent normal TSH values are proposed for pregnancy. The range of serum TSH levels in the first trimester of pregnancy is 0.03 to 2.3 mIU/L; the upper limit of normal is 3.5 mIU/L in both the second and third trimesters of pregnancy.