Objectives: This study aimed to analyze the critical values data at a tertiary care hospital in New Delhi , India in the emergency laboratory setting and compare it with the available data from previous studies. Material and methods: The critical values data of several biochemical parameters generated from the testing of samples on Beckman Coulter Olympus AU 480 .during three months period were analyzed. Results Total 183056 tests were analyzed and 11875 critical alerts were generated the incidence of which varied from 0.8% for glucose (children) to 10.6% for serum potassium in children. Discussion: Frequency of critical values for serum Potassium is highest followed by serum sodium. Also, critical values for serum Potassium in paediatric patients is higher than adults. Conclusion: Further studies of critical values in emergency labs is required to observe trends, identify the underlying causes and suggest suitable remedial measures if any.