CRP and COVID-19: TT3 and TSH levels were significantly lower in COVID-19 patients (p < 0.001).Thyroid dysfunction was more commonly found in critical than in mild/moderate cases (74.6 vs 23.8%, p < 0.001).The group with thyroid dysfunction also had an increased level of leukocytes (p < 0.001), neutrophils (p < 0.001), CRP (p = 0.002), and PCT (p = 0.054); and a decreased level of lymphocytes (p < 0.001).