Which laboratory finding is characteristic of nephrotic syndrome?

Which laboratory finding is characteristic of nephrotic syndrome?

• A. Hypoalbuminemia
• B. Hyperkalemia
• C. Leukocytosis
• D. Hypernatremia

Answer: (A)

Nephrotic syndrome is defined by heavy protein loss in the urine, which drives a low serum albumin level. Albumin is the main protein keeping fluid inside blood vessels by maintaining oncotic pressure; when it’s lost in urine (proteinuria >3.5 g/day), plasma oncotic pressure falls, fluid shifts into the interstitial space, and edema develops. The resulting hypoalbuminemia is the characteristic laboratory finding because it directly reflects the major pathogenic process—massive protein loss in the urine. Other choices don’t define the syndrome. Hyperkalemia can occur with kidney failure or certain meds, but it isn’t specific to nephrotic syndrome. Leukocytosis points to infection or inflammation rather than this renal condition. Hypernatremia isn’t a defining feature either; while sodium balance can be affected, the hallmark remains low albumin from urinary protein loss.

Nephrotic syndrome is defined by heavy protein loss in the urine, which drives a low serum albumin level. Albumin is the main protein keeping fluid inside blood vessels by maintaining oncotic pressure; when it’s lost in urine (proteinuria >3.5 g/day), plasma oncotic pressure falls, fluid shifts into the interstitial space, and edema develops. The resulting hypoalbuminemia is the characteristic laboratory finding because it directly reflects the major pathogenic process—massive protein loss in the urine.

Other choices don’t define the syndrome. Hyperkalemia can occur with kidney failure or certain meds, but it isn’t specific to nephrotic syndrome. Leukocytosis points to infection or inflammation rather than this renal condition. Hypernatremia isn’t a defining feature either; while sodium balance can be affected, the hallmark remains low albumin from urinary protein loss.