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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.
A normal T3 level is between 3-8. For T4, the range is 4-11. If T3 and T4 levels are under 3, and 4, respectively, then your thyroid is sluggish (itâs not creating enough hormones for your body). In other words, you are dealing with hypothyroidism.For those who have values above the normal ranges, it shows an overactive thyroid, also known as hyperthyroidism.f T3 and T4 levels are under 3, and 4, respectively, then your thyroid is sluggish (itâs not creating enough hormones for your body). In other words, you are dealing with hypothyroidism. For those who have values above the normal ranges, it shows an overactive thyroid, also known as hyperthyroidism.