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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.
4. Hypothyroidism is treated by supplements of thyroid hormones and hyperthyroidism is treated by anti-thyroid drugs. 5. Hypothyroidism shows decreased levels of T3 and T4 and increased levels of TSH whereas in hyperthyroidism, there is an increased levels of T3 and T4 and a decreased level in TSH.n hyperthyroidism, there are increased levels of thyroid hormones T3 and T4 and decrease in the levels of TSH. TSH is thyroid stimulating hormone. SUMMARY: 1. Hyperthyroidism is increased levels of thyroid hormones whereas hypothyroidism is decreased levels of thyroid hormones.