Chronic obstructive pulmonary disease (COPD) has many systemic effects, one of which is impaired renal function. Existing studies prove that patients with COPD often have risk factors for developing chronic kidney disease (CKD). Many risk factors for developing COPD are common for the onset of CKD. However, in routine clinical practice, there is an underestimation of the incidence of renal dysfunction in COPD patients, while in-depth and targeted studies reveal changes in renal function in patients with COPD. Topical methods for identifying initial changes in renal function in COPD patients are the study of the glomerular filtration rate, the evaluation of the level of microalbuminuria, the study of the index of resistance of renal vessels. The importance of identifying CKD in the early stages in COPD patients is determined by the increased risk of cardiovascular events and the onset of cardiorenal syndrome in patients.