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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.
If the thyroid TSH levels are low, hyperthyroidism is instead a most likely diagnosis. Normal TSH range levels are between 0.3 and 3.0 and when the thyroid is assumed to be functioning well. Many practitioner, especially when fertility and pregnancy are concerned, prefer to see TSH levels less than 2.