A child develops cola-coloured urine and hypertension two weeks after a sore throat. Which blood test result is expected?
Answer and explanation
Correct answer: D. Low serum C3 complement
- Step 1: The time course after streptococcal infection points to post-infectious glomerulonephritis. Step 2. Immune complex deposition consumes complement, so C3 is low and ASO titres are raised, and recovery is usually spontaneous. Answer: Low serum C3 complement. Why not the others: C3 is not raised. ANCA positivity suggests small-vessel vasculitis. A negative ASO would argue against recent streptococcal infection.
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