Intraerythrocyte and blood level ATP concentration is increased in CRF. But little is known on the blood concentration of ADP and AMP in CRF. HPLC was applied to evaluate the ATP, ADP, AMP concentration in blood of 25 CRF patients, with serum creatinine from 2.4 mg/dl to 14.4 mg/dl treated conservatively. Controls were healthy people, with normal renal function. In CRF ATP was higher (p < 0.001) and ADP, AMP and hypoxanthine were lower (p < 0.001) then in controls. Also ATP correlated (r = 0.78; p < 0.001) with serum phosphate and (r = 0.40; p < 0.05) with serum creatinine in CRF patients. Adenine nucleotides turnover is increased in CRF and this process is related to severity of the disease.