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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.
Therefore a high TSH level suggests an underactive thyroid (hypothyroidism), while a low TSH indicates too much thyroid hormone in the body (hyperthyroidism). In my post âMiscarriage in New York Cityâ¦Be Thyroid Awareâ, I outlined the TSH ranges for pregnancy and provided trimester-specific ranges.