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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 T4 is in the low (but still ânormalâ) range and the T3 is to the right of it in the low but normal range, it means that the T4 is converting to T3 at a high rate (more T3, less RT3). This is typically found when the thyroid gland is unable to keep up T4 production to meet the bodyâs needs.n the cases of Free T4 (FT4) and Free T3 (FT3), the optimal zone is roughly half way between the usual lab normal Low-High values. Note that the normal range for these hormones may change a bit from lab to lab. In the case of TSH, the optimal zone is skewed far toward the low end of the standard lab Low-High range.