Usefulness of Neutrophil Gelatinase-associated Lipocalin(NGAL) to Confirm Acute Kidney Function Decrease of the Patients Who Had Non-cardiac Surgery

Although post-op renal function decrease is determined by serum creatinine, serum creatinine has disadvantages that it increases a long time after renal function decrease and it has various increasing time based on the level of renal function. Neutrophil Gelatinase-associated Lipocalin (NGAL's) usefulness as an evidence for acute kidney damage occurring from post-op cardiac surgery, being critical patients and contrast medium use is already proven.

But NGAL's usefulness for renal function after non-cardiac surgery is not proven and especially, NGAL's usefulness for renal injury after non-cardiac surgery in chronic renal disease patients is not proven.Therefore, the investigators will study about renal function decrease after non-cardiac surgery with NGAL and serum creatinine.