The utilization of laboratory tests in the emergency department (ED) plays a crucial role in the triage and management of patients presenting with various medical conditions. This review article aims to explore the significance of laboratory tests in enhancing the efficiency and accuracy of ED triage processes, as well as their role in guiding appropriate patient management strategies. The review will discuss the types of laboratory tests commonly used in the ED setting, their interpretation, and the impact of timely test results on clinical decision-making. Furthermore, the article will highlight the challenges and limitations associated with the use of laboratory tests in the ED, including issues related to test availability, turnaround times, and cost-effectiveness. By examining current evidence and best practices, this review seeks to provide insights into optimizing the use of laboratory tests to improve patient outcomes and resource utilization in the ED setting.