Which parameter is commonly used to assess volume status in heart failure patients during follow-up?

• A. Left ventricular ejection fraction
• B. Daily body weight change
• C. Sputum color
• D. Serum potassium level

Answer: (B)

In heart failure follow-up, monitoring fluid status is essential because small shifts in fluid can quickly worsen symptoms and exercise tolerance. Daily body weight change is the most practical, sensitive proxy for these fluid shifts. A rapid gain from fluid retention often shows up as weight increase over a short period, signaling that diuretic therapy may need adjustment before symptoms flare. Conversely, a deliberate weight loss during diuresis indicates effective fluid removal. This single, objective number collected at home or in clinic reliably tracks volume status over time and guides management.

Left ventricular ejection fraction measures how well the heart pumps, not how much fluid is in the body right now, so it doesn’t reflect current volume status. Sputum color is not a reliable indicator of fluid balance and can be affected by infection or inflammation. Serum potassium is important for medication safety and rhythm risk, but it doesn’t tell you about the patient’s fluid overload or depletion.