Acute Kidney Injury(AKI) is of the serious complications in patients with undergoing on-pump cardiac surgery. End stage kidney failure requiring dialysis therapy after cardiac surgery is associated with more than 60% mortality rate. Involvement of AKI after on-pump cardiac surgery increases the mortality rate 19 times. suPAR is one of the novel biomarker which has potential prognostic value for renal dysfunction in patients with undergoing on-pump cardiac surgery. Early diagnosis and prompt intervention to prevent AKI has great importance for management of postoperative cardiac patients.

Inclusion Criteria:

• Approved informed concent Age higher than 18 years old

Exclusion Criteria:

• Chronic kidney disease Renal transplantation Cancer history Previous cardiac surgery Sepsis Liver failure Thyroid dysfunction Having long term steroid therapy Having renal replacement therapy Exposure to nephrotoxic drug and radiocontrast substance before 5 days of surgery Diagnosis of Acute Kidney Injury Intraaortic balloon or Extracorporeal Membrane Oxygenation insertion after surgery

Patients scheduled for elective on-pump cardiac surgery with no known kidney disease