Volume depletion involves which fluid compartment loss and is a what kind of event?

• A. Intracellular fluid loss; elective
• B. Extracellular fluid loss; emergency
• C. Intracellular fluid loss; emergency
• D. Extracellular fluid loss; elective

Answer: (B)

Volume depletion describes loss from the extracellular fluid compartment, which includes the plasma and interstitial fluid. When this fluid is reduced, the circulating blood volume falls, leading to hypovolemia. That’s why it’s considered an emergency— the drop in intravascular volume can rapidly compromise tissue perfusion and lead to shock if not corrected promptly. Losing fluid from the intracellular space would cause cells to shrink from osmotic shifts, not a drop in overall circulating volume, and an elective scenario doesn’t fit the typically abrupt, life‑threatening nature of volume depletion.