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Respiratory ECMO scores 4 regardless of the ratio.", "type": "number" }, "platelets_10e9_l": { "description": "Platelets ×10^9/L, same as ×10^3/μL (1-2000). >150 scores 0; ≤150 scores 1; ≤100 scores 2; ≤80 scores 3; ≤50 scores 4.", "type": "number" }, "rrt": { "description": "Receiving renal replacement therapy or fulfilling published RRT criteria, including chronic use (Ranzani 2025). true or false when provided; absent is false. true scores kidney 4. Non-renal RRT is not scored; the caller assigns this flag.", "type": "boolean" }, "spo2": { "description": "Pulse-oximetry SpO2 as a percent (50-97.9). Used with fio2 only when pao2_mm_hg is absent and SpO2 is <98 (Ranzani 2025). SpO2/FiO2 >300 scores 0; ≤300 scores 1; ≤250 scores 2; ≤200 with advanced ventilatory support scores 3; ≤120 with advanced ventilatory support or ECMO scores 4.", "type": "number" }, "urine_output_ml_kg_h": { "description": "Urine output in mL/kg/h (0-20) when provided. 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