The prevalence of chronic kidney disease (CKD) in the world is constantly increasing. This is related to the eldering of the societies, growing numbers of patients with diabetes, hypertension, atherosclerosis and obesity. The progress of the disease increases the risk of complications and mortality, especially from cardiovascular causes and leads to end-stage renal disease requiring renal replacement therapy. The analysis involving 1452 patients (762 women and 690 men aged 57.4 years ± 19.8 years) from the Emergency Department in Kielce revealed reduced eGFR below 60 ml/ min/1,73 m2 in 474 (32.6%) of participants and mean values of eGFR was 68.6 ± 22.3 ml/min/1.73 m2. Such high percentage of patients fulfilling criteria of CKD may be due to the fact that to the Emergency Department coming patients with high comorbidity and with increased risk of kidney disease.