In SIADH management, which daily activity is appropriate?

• A. Weigh daily
• B. Increase fluids
• C. Administer hypotonic IV fluids
• D. Ignore weight changes

Answer: (A)

In SIADH, the primary challenge is excess free water retention that dilutes serum sodium, so keeping a close eye on fluid status is essential. Weighing yourself daily provides a simple, reliable indicator of shifts in extracellular fluid. A small daily weight gain can signal fluid accumulation from ongoing ADH activity, suggesting the need to adjust fluid restriction or treatment; a stable or decreasing weight suggests the body is responding. Weighing should be done with the same scale, at the same time each morning after voiding to ensure accuracy.

Increasing fluids would worsen the hyponatremia by adding more free water. Administering hypotonic IV fluids directly adds free water and would exacerbate the problem. Ignoring weight changes misses important signs of fluid imbalance, delaying appropriate management.