A 28-year-old man from rural India presents with gross haematuria, tea-coloured urine, and facial puffiness for 5 days. He reports a sore throat 2 weeks prior. On examination: BP 156/98 mmHg, periorbital oedema, mild ascites. Urinalysis shows 3+ proteinuria, RBC casts, and dysmorphic RBCs. Serum creatinine is 1.8 mg/dL (baseline 0.8), and complement C3 levels are low. What is the most appropriate immediate next step in management?

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