What sequence is used for conducting a blood sweep in a casualty?

The correct answer involves the acronym that is commonly recognized as MARCH, which stands for Massive hemorrhage, Airway, Respiratory, Circulation, and Hypothermia. This sequence is utilized in trauma care, particularly in mass casualty situations, to systematically address the most critical life-threatening injuries a casualty might have.

In the context of conducting a blood sweep, it's essential to prioritize massive hemorrhage first, as it is the most immediate threat to life. After controlling any significant bleeding, attention can turn to ensuring the airway is clear, monitoring breathing, and managing circulation and temperature.

The other acronyms or terms presented do not appropriately sequence the life-saving interventions needed in trauma situations. Therefore, following the MARCH sequence helps ensure that both the most urgent and potentially lethal conditions are addressed promptly and effectively.