Severe dehydration / hypovolemia — hypotension, marked tachycardia, oliguria/anuria, or acute confusion — escalate/transfer; sepsis signs → transfer.
Acute kidney injury signs — a sharp drop in urine output with a rising creatinine — escalate (route to Genitourinary/Renal).
Fluid overload / pulmonary edema from over-hydration — severe dyspnea, hypoxia, crackles — hold fluids per order and escalate/transfer (route to CHF overlay).
Severe electrolyte disturbance — symptomatic hyper/hyponatremia or hyper/hypokalemia (confusion, weakness, arrhythmia, seizure) — escalate/transfer.