What is the range for sodium concentrations of homemade or commercial oral rehydration solutions?

What is the range for sodium concentrations of homemade or commercial oral rehydration solutions?

• A. 60-90 mmol/L
• B. 30-60 mmol/L
• C. 90-120 mmol/L
• D. 120-150 mmol/L

Answer: (A)

Sodium level in oral rehydration solutions is chosen to support efficient intestinal water absorption while staying safe for most patients. Water and electrolyte absorption in the gut during diarrhea is driven in large part by the sodium-glucose co-transport mechanism; having the right sodium concentration in the rehydration solution ensures this transport works well, so fluids are replenished effectively. A sodium concentration around 60–90 mmol/L is able to replace stool losses without pushing sodium too high, which could risk hypernatremia, especially in children. The standard formulations, including commonly used commercial ORS and many homemade recipes, typically fall in this range (for example, about 75 mmol/L in widely used guidelines). If the sodium concentration were much lower, absorption and rehydration would be less effective; if it were much higher, there’s a greater risk of disturbing plasma osmolality and causing hypernatremia. Thus, 60–90 mmol/L reflects a practical, evidence-based balance that supports rapid rehydration via the sodium-glucose transport mechanism while maintaining safety across varied patient populations.

Sodium level in oral rehydration solutions is chosen to support efficient intestinal water absorption while staying safe for most patients. Water and electrolyte absorption in the gut during diarrhea is driven in large part by the sodium-glucose co-transport mechanism; having the right sodium concentration in the rehydration solution ensures this transport works well, so fluids are replenished effectively.

A sodium concentration around 60–90 mmol/L is able to replace stool losses without pushing sodium too high, which could risk hypernatremia, especially in children. The standard formulations, including commonly used commercial ORS and many homemade recipes, typically fall in this range (for example, about 75 mmol/L in widely used guidelines). If the sodium concentration were much lower, absorption and rehydration would be less effective; if it were much higher, there’s a greater risk of disturbing plasma osmolality and causing hypernatremia.

Thus, 60–90 mmol/L reflects a practical, evidence-based balance that supports rapid rehydration via the sodium-glucose transport mechanism while maintaining safety across varied patient populations.