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Hui Chen, Jun-Qiang Ju, Xiao-Wu Qian, Zheng-Tai Zhu, Chun-Zhi Zhao, Zhe Liu Department of Geriatrics, Taizhou People’s Hospital Affiliated to Nanjing Medical University, Taizhou, Jiangsu, People’s Republic of ChinaCorrespondence: Hui Chen, Department of Geriatrics, Taizhou People’s Hospital Affiliated to Nanjing Medical University, No. 399 Hailing South Road, Taizhou, Jiangsu, People’s Republic of China, Tel +86 15996006135, Email chenhuichenping@163.comPurpose: To investigate the thyroid parameters (thyroid stimulating hormone (TSH), free triiodothyronine (FT3), and free thyroxine (FT4)) and their relationship with inflammatory indicators (neutrophil/lymphocyte ratio (NLR) and platelet/lymphocyte ratio (PLR)) in euthyroid individuals with type 2 diabetes mellitus (T2DM).Patients and Methods: Our study included 672 participants diagnosed with T2DM, and 336 healthy individuals matched in terms of age and gender. The laboratory inspection data of both type 2 diabetic patients and healthy individuals as controls were analyzed separately.Results: Compared with a control group, the individuals with T2DM presented elevated levels of inflammatory indicators, including white blood cells (WBC), neutrophils (NEUT), neutrophil/lymphocyte ratio (NLR), and platelet/lymphocyte ratio (PLR). The levels of TSH are elevated in the T2DM group, whereas the levels of FT3 or FT4 are reduced. TSH levels were significantly positively correlated with NLR or PLR, while the levels of FT3 and FT4 were significantly negatively correlated with NLR or PLR. Furthermore, thyroid parameters were correlated with gender, age, and blood lipid metabolism. Multiple stepwise regression analysis identified gender, NLR, PLR, and low-density lipoprotein (LDL) as significant contributing factors for TSH. Additionally, gender, age, NLR, PLR, glycated hemoglobin A1c (HbA1c), and LDL were identified as contributing factors for FT3, while PLR and total cholesterol (TC) were identified as contributing factors for FT4.Conclusion: Abnormal metabolism of thyroid parameters is associated with increased inflammatory activity and impaired glycolipid metabolism in euthyroid type 2 diabetic patients.Keywords: thyroid parameters, thyroid function, type 2 diabetes mellitus, neutrophil/lymphocyte ratio, platelet/lymphocyte ratio