It has been reported that serial measurements of procalcitonin may be used to evaluate the progression of the disease to a more severe form.25 In their study with 191 COVID-19 patients, Bastuğ et al26 concluded that the increase in CRP is one of the strong indicators of prognosis in the comparison of intensive care unit (ICU) and non-ICU patients. Here, CRP is linked to COVID-19.