When type O blood is not available at a disaster scene, what do medics give to replace lost volume?

1. With many victims bleeding at once, type O blood may simply not be available. 2. The immediate threat is the lost volume rather than the lost oxygen-carrying capacity. 3. Medics give an intravenous saline solution providing fluids and electrolytes in proportions equivalent to normal plasma. 4. This replaces volume without any risk of an incompatibility reaction, since no cells and no antibodies are introduced. 5. An oral route would be far too slow in acute hemorrhage, so the last option fails on timing alone. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 18 "The Cardiovascular System: Blood", section 18.6 Blood Typing_