Which condition is characterized by edema and heavy proteinuria often requiring sodium restriction?

• A. Nephrotic syndrome
• B. Heart failure
• C. Dehydration
• D. Renal calcinosis

Answer: (A)

Nephrotic syndrome involves a large amount of protein leaking into the urine, which lowers the blood’s albumin level and reduces plasma oncotic pressure. That drop causes fluid to shift into tissues, producing edema. Because the body senses low circulating volume, it activates mechanisms that retain sodium and water, so limiting sodium intake helps reduce the fluid buildup. Typical accompanying features include hypoalbuminemia and often hyperlipidemia, making edema with heavy proteinuria a classic sign. This pattern isn’t seen with dehydration (which reduces fluid elsewhere) or with heart failure or renal calcinosis, where edema arises from different processes and heavy proteinuria isn’t a defining feature.