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Low-Normal Thyroid Function Predicts Incident Anemia in the General Population With Euthyroid Status.

Yeqing Gu1, Vu Thi Quynh Chi1, Qing Zhang2

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Thyroid hormones (THs) impact anemia development in euthyroid individuals. Lower free T3 and free T4 levels are linked to increased anemia risk and decreased hemoglobin over time.

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Area of Science:

  • Endocrinology
  • Hematology
  • Epidemiology

Background:

  • Thyroid hormones (THs) influence hematopoiesis, but their role in anemia development among euthyroid individuals is understudied.
  • Understanding THs' physiological effects on blood is crucial for preventing anemia in the general population.

Purpose of the Study:

  • To investigate the association between thyroid hormones (THs) and incident anemia in a general euthyroid population.
  • To explore the predictive value of THs for future anemia and hemoglobin changes.

Main Methods:

  • A large cohort study with 12,310 participants and a mean follow-up of 3.1 years.
  • Measurement of free T3 (FT3), free T4 (FT4), and TSH using chemiluminescence immunoassay.
  • Application of multivariable Cox proportional hazards regression to analyze the association between THs, TSH, and incident anemia.

Main Results:

  • Lower FT3 and FT4 levels were significantly associated with an increased risk of developing anemia.
  • Higher FT3 and FT4 levels correlated with positive annual changes in hemoglobin (Hb).
  • TSH levels did not show a statistically significant association with incident anemia.

Conclusions:

  • Thyroid hormones (THs) are significant predictors of future anemia and hemoglobin changes in euthyroid individuals.
  • Physiological levels of THs play a role in maintaining hematological health.
  • These findings highlight the importance of monitoring thyroid function in relation to anemia risk.