Which of the following is NOT a criterion for 'In extremis' patients?

'In extremis' patients refer to those who are in a critical state and require immediate intervention to survive. The criteria for identifying these patients typically include life-threatening conditions that pose an immediate risk to life or limb.

Severe abdominal pain, while it can indicate a serious underlying condition (such as an acute abdomen), does not always signify that a patient is in an immediate life-threatening situation. Other symptoms like uncontrolled airway issues, protruding limbs, and visible external bleeding are more clearly associated with urgent, potentially fatal circumstances. An uncontrolled airway may result from severe trauma or obstruction, protruding limbs may indicate severe fractures or crush injuries, and visible external bleeding could be life-threatening if not managed promptly.

In contrast, severe abdominal pain could stem from a variety of issues, some of which may not require urgent surgical intervention or could be managed with less immediate action. Thus, it does not fit the criteria of being an 'In extremis' condition as clearly as the other choices do.