One of the classic triad symptoms in infants with renal venous thrombosis is which finding?

• A. Hypotension
• B. Thrombocytopenia
• C. Polyuria
• D. Hematuria

Answer: (B)

In neonatal renal vein thrombosis, a recognizable pattern is the combination of blood in the urine together with a low platelet count due to consumptive coagulopathy from the clot. The thrombosis in the renal vein activates the clotting process locally, which uses up platelets, leading to thrombocytopenia, while the involved kidney often sheds blood into the urine. That platelet drop is a distinctive part of the triad that clinicians look for, making thrombocytopenia the best match among the options. While hematuria can occur with RVT, the presence of thrombocytopenia reflects the consumptive, triad-associated process and helps differentiate this condition from others. hypotension and polyuria are not classic features of the RVT triad.