Correlation of arterial versus venous blood gas measurements in trauma patients presenting in the emergency department of a tertiary care centre in chennai javid v.k1, mahalakshmi sivapackiam2, gomathi karmegam3, janani jayakumar4international journal of academic medicine and pharmacy (www.academicmed.org) issn (o): 2687-5365; issn (p): 2753-6556.2023