*over or under performance to benchmark index Diagnostics business gross revenue rose 11.1% YoY to Rs. 387cr, driven by portfolio expansion, improving customer touchpoints and sustained traction across preventive and core testing segments. EBITDA increased 22.2% YoY to Rs. 532cr, while EBITDA margin expanded 80bps to 22.5%, driven by operating leverage, better hospital profitability and continued improvement in diagnostic business execution...