Elevated lactate levels are frequently found in critically ill patients and often correlate with the disease severity. Because of its prognostic role, lactate has been widely used as a biomarker for screening, diagnosis, risk stratification, and monitoring in critically ill patients. Multiple studies have evaluated the prognostic value of lactate in heterogeneous groups of critically ill patients, in the intensive care unit (ICU) and emergency department settings. Most of those studies involved patients with sepsis, trauma, shock, or severe respiratory failure. On the other hand, data on the significance of lactate monitoring in a relatively homogeneous population of patients undergoing elective major abdominal surgery is scarce. The present study was planned in the Department of General Surgery; Katihar Medical College. Total 25 patients diagnosed with the acute abdomen requiring emergency abdominal surgeries were enrolled in the present study. The details of patients who presented from Nov 2011 to march 2012 were enrolled in the present study. Preoperative Lactate levels measured in all patients and were compared among survivor and mortality group. These findings are of value in clinical practice as it may be possible to use the initial post-operative lactate concentration to determine the patient pathway in the early post-operative period. In addition the correlation of post-operative lactate with subsequent organ dysfunction and mortality may allow its use as a single measure of the impact of innovations in operative technique or peri-operative care. However, further studies are required to indicate which strategies aimed at resolving hyperlactatemia improve postoperative outcomes.