D-dimer level(3) D-dimer levels(3) positive PCR(3) COVID-19(3) performed(3) Chronic kidney disease(3) diagnosis of COVID-19(3) serum(3) Kidney disease(3) patients(3) Hospital stay(3) renal(3) reactive(3) frailty(3) significantly higher(3) renal function(3) Patient(3) incidence(3) Analysis(3) serum parameters(3) difference(3) SARS-CoV-2(3) treated(3) hypertension(3) was recorded(3) AKI(3) epidemiological data(3) renal replacement therapy(3) replacement therapy(3) positive(3)