The only accepted objective method for diagnosis of ACS is to measure the pressure inside the leg compartments by using a large gauge needle hooked to a pressure monitor. However, these readings can be erroneous if not performed correctly. As such, ACS continues to be a clinical diagnosis which is made based on the surgeon's experience and their interpretation of the character of the injury (high-energy, motorcycle crash, vs. low-energy, a twisted ankle). Clinicians are left to attempt to interpret physical exam findings and readings from pressure monitors. Most importantly ACS is not an event, but a process that can manifest at multiple points after injury. The most accurate and effective method for diagnosing and appropriately treating ACS is serial examination over a course of hours to days.