Field Medical Training Battalion - West (FMTB-W) Block 2 Practice Exam

What is the recommended hydration rate during activities?

2 quarts per hour 500 ml per hour 2 liters per hour 1 qt per hour, no more than 1.5 liters per hour

Correct Answer:

1 qt per hour, no more than 1.5 liters per hour

Explanation:

Maintain fluid intake at a rate your body can absorb while you’re active. The best balance is about 1 quart per hour, with a ceiling of roughly 1.5 liters per hour. This range aims to replace sweat losses without overwhelming the stomach or diluting blood electrolytes, which can lead to stomach upset or exercise-associated hyponatremia. In practice, sip steadily—roughly a bottle every 15 minutes—and adjust for how hard you’re working and the environment. If you sweat a lot in heat, you may approach the upper end, but avoid going beyond 1.5 L per hour. Drinking far less can lead to dehydration, while drinking significantly more won’t speed hydration and can cause GI distress and electrolyte imbalance.

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