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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.
Normally the reference range for TSH is around 0.5 to 5.0 but thyroid doctors have been debating these numbers for years. 0.03 is lower than ânormalâ however TSH does not give a full picture. You should speak with your doctor about testing your Free T4, Free T3, Reverse T3, and thyroid antibodies.tâs really informative. I had my first TSH diagnosis done recently and my TSH level was 4.46 ,free T3 -2.11 and free T4 -1.17. Iâm 20 weeks pregnant with my first child (thatâs when I had my test done). My doctor has put me on thyronorm 25mcg.