ACTA ENDOCRINOLOGICA (BUC)

Background. The study included 505 patients, including 190 healthy controls, 166 euthyroid Hashimoto's thyroiditis (HT), 91 hypothyroid HT, and 58 nonimmunogenic hypothyroidism (NIH) patients. The records of the patients in each group were reviewed retrospectively. Objectives. The objective of this study was to evaluate the Systemic Inflammation Index (SII), Platelet to Lymphocyte Ratio (PLR), and Neutrophil to Lymphocyte Ratio (NLR) in HT and NIH, as well as their diagnostic value to predict the presence of inflammation. Results. In terms of SII, there was a significant difference between the control and patient groups (p<0.001). PLR and NLR values were also found to be significantly higher in the patient group (p<0.001 and p=0.007, respectively). When euthyroid HT, hypothyroid HT, and NIH subgroups were compared to the control group, there was a significant difference in SII, PLR (for all p<0.001), but not in NLR (p=0.059). SII, PLR, and NLR were not different between the subgroups (p=0.595, p=0.861, and p=0.777, respectively). Conclusion. It was found that the PLR, NLR, and SII indices were higher in Hashimoto’s thyroiditis and non-immunogenic hypothyroidism. Of these indices, SII was the most powerful marker to predict the presence of inflammation.