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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.
Ask a question. Low t3 levels in 3rd trimester pregnancy. coyle. Am taking synthroid only 137 and latest lab has the ft4 midrange, t4 too high and t3 too low, but think endo will just want to raise t4 med to 150 and not give t3 meds. TSH is all he cares about and it it up to 1.65.