In rehab, IV fluids are considered when there is a clear need to restore or protect hydration and circulating volume, and this can arise from multiple real-world scenarios. When signs of significant dehydration are present—such as dry mucous membranes, reduced urine output, dizziness or faintness, rapid heart rate, or low blood pressure—IV fluids can rehydrate more quickly and safely than relying on oral intake alone, which is especially important after intense exertion and heat exposure. If a firefighter cannot tolerate oral intake because of vomiting, nausea, or other GI distress, IV access provides a reliable way to maintain hydration and electrolyte balance without risking aspiration or inadequate fluid absorption. Medical direction is essential because clinicians assess the individual’s overall condition, including any electrolyte disturbances, comorbidities, or contraindications that would affect fluid choices and risks. When a medical evaluation directs it, IV fluids ensure appropriate and safe management tailored to the person’s status. Because each of these situations can justify IV fluids on its own, together they cover the practical reasons IV therapy is considered in rehab. Always use IV fluids under medical supervision with appropriate monitoring to avoid fluid overload or other complications.