Which finding is most characteristic of nephritic syndrome?

• A. Hematuria with RBC casts and hypertension
• B. Massive proteinuria with hypoalbuminemia
• C. Lipiduria
• D. Proteinuria with minimal hematuria

Answer: (A)

Nephritic syndrome reflects inflammatory injury to the glomeruli, which causes bleeding into the urine and impaired kidney function. The most characteristic finding is hematuria with red blood cell casts because the inflamed glomerular capillaries leak red cells into the urine, and these red cells become entrapped and shaped into casts as they pass through the tubules. Hypertension accompanies this picture due to reduced kidney function and ongoing salt and water retention from the diseased glomeruli.

In contrast, heavy proteinuria with hypoalbuminemia and lipiduria point to nephrotic syndrome, where the kidney leakiness primarily allows large amounts of protein to pass into the urine and triggers hypoalbuminemia and lipid abnormalities. Proteinuria with minimal hematuria can occur in milder or different glomerular diseases but does not characteristicly unite the features of glomerular inflammation with blood in the urine and high blood pressure that define nephritic presentations.