The relationship between serum calprotectin levels and disease activity in patients with subacute thyroiditis.

Objective: Increased calprotectin (S100A8/A9) levels have been demonstrated in many acute and chronic inflammatory processes. Subacute thyroiditis is an inflammatory disease of the thyroid gland. In our study, we investigated the value of this inflammation marker in the diagnosis and follow-up of subacute thyroiditis.

Patients And Methods: Patients with subacute thyroiditis admitted to our clinic between November 2018 and January 2020 were included in the study. In the acute phase of the disease, fT4 (free thyroxin), TSH (Thyroid Stimulant Hormone), CRP (C Reactive Protein), ESR (Erythrocyte Sedimentation Rate), ALT (Alanine Aminotransferase), AST (Aspartate Aminotransferase), Creatinine, WBC (White Blood Cell), Absolute Lymphocyte and Neutrophil Count (ALC, ANC) parameters were detected and recorded. After complete resolution of the disease, the same laboratory parameters and acute phase reactants were again detected. Additionally, Calprotectin determination was performed in the acute phase and recovery period. Persistent hypothyroidism was determined by 6th-month TSH levels.

Results: Thirty-six patients were included in the study. Along with the classical acute phase reactants and ANC, there was a significant increase in the Calprotectin levels in the acute inflammatory phase of the disease compared to the recovery period (96. 92-37.98, p<0.001). Neither classical acute phase reactants and nor calprotectin were found to have a significant effect on the development of permanent hypothyroidism. Calprotectin did not correlate with other acute phase reactants, absolute neutrophil count and TSH levels in both the acute phase and resolution period.

Conclusions: Calprotectin appears to be an important marker in the diagnosis and follow-up of subacute thyroiditis.