What question did this study set out to answer?

To investigate the relationship between thyroid hormone levels within the euthyroid range and lipid levels.

April 22, 2026

Thyroid Hormone Levels, even within the Euthyroid Range, are Associated with Lipid Levels.

RSR S SudharshiniTrichy SRM Medical College Hospital and Research Centre AVA VelayutharajTrichy SRM Medical College Hospital and Research Centre MMMonisha MohanTrichy SRM Medical College Hospital and Research Centre

Key Points

To investigate the relationship between thyroid hormone levels within the euthyroid range and lipid levels.
Analyzed data from euthyroid subjects regarding fT3 and lipid levels.
Evaluated the association specifically with HDL cholesterol and TSH levels.
Examined differences between genders in the analysis.
fT3 showed a significant positive association with HDL cholesterol levels.
This association was stronger in men compared to women.
It was particularly noted in subjects with TSH levels ≥ 3 µIU/mL.

Abstract

Among euthyroid subjects, fT3 seems to have a significant and consistent favorable association with lipid levels, especially with HDL cholesterol. This positive association of fT3 with HDL is more marked in men and in subjects with TSH ≥ 3 µIU/mL.

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