Which daily fluid limit is typical for SIADH management?

Which daily fluid limit is typical for SIADH management?

• A. Less than 500 mL per day
• B. 1000-1500 mL per day
• C. 2000 mL per day
• D. Less than 1000 mL per day

Answer: (D)

In SIADH, the body holds onto too much water due to excess ADH, which dilutes blood sodium. The main way to address this is to restrict free water intake so the serum sodium can rise gradually as the kidneys excrete the extra water. A typical daily fluid limit used in management is a strict restriction to about one liter of free water per day or less. This small intake reduces ongoing dilution without causing abrupt changes, helping correct hyponatremia safely. While fluid restriction is the cornerstone, patients are monitored closely for sodium levels to avoid too rapid correction, which can risk osmotic demyelination. In more severe or non-responsive cases, additional therapies may be considered under careful supervision, but the usual target is keeping daily intake to a low, limited amount.

In SIADH, the body holds onto too much water due to excess ADH, which dilutes blood sodium. The main way to address this is to restrict free water intake so the serum sodium can rise gradually as the kidneys excrete the extra water. A typical daily fluid limit used in management is a strict restriction to about one liter of free water per day or less. This small intake reduces ongoing dilution without causing abrupt changes, helping correct hyponatremia safely. While fluid restriction is the cornerstone, patients are monitored closely for sodium levels to avoid too rapid correction, which can risk osmotic demyelination. In more severe or non-responsive cases, additional therapies may be considered under careful supervision, but the usual target is keeping daily intake to a low, limited amount.