Lactated Ringers is fluid given to a dehydration casualty in a combat environment. What is it used for?

• A. Normal saline
• B. Lactated Ringers
• C. Dextrose
• D. Distilled water

Answer: (B)

Fluid resuscitation aims to rapidly restore circulating volume with a solution that closely matches the body’s electrolyte needs. Lactated Ringer's is a balanced isotonic crystalloid that mirrors plasma more closely than plain saline. It contains sodium, chloride, potassium, calcium, and lactate. When given, it expands the intravascular space and helps restore tissue perfusion while also supplying essential electrolytes. The lactate component is metabolized to bicarbonate, providing a mild buffering effect that can help counteract the acidosis that often accompanies dehydration and injury. This makes it especially useful in a combat setting, where you want quick volume expansion and a better-balanced electrolyte profile without introducing excess chloride or sugar. In contrast, distilled water isn’t suitable for IV use, dextrose is mainly a sugar solution, and normal saline, while usable, can be less balanced in large volumes.