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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 a patient's TSH falls in the normal range, thyroid tests for free T4 and free T3 and thyroid antibodies can rule out hypothyroidism and hyperthyroidism.hyroid stimulating hormone (TSH) levels evaluate the functioning of the thyroid gland. TSH instructs the thyroid to produce thyroid hormone. High TSH levels indicate that the thyroid is underactive, and a low TSH means the thyroid is overactive.