The MEDiscuss Renal Synthesis Engine employs a dual-pathway algorithmic framework. For patients in a steady physiological state, it simultaneously calculates the Cockcroft-Gault Creatinine Clearance (utilising a strict body weight protocol) for pharmacological dosing, alongside the race-free CKD-EPI 2021 eGFR for diagnostic staging. Conversely, when Acute Kidney Injury (AKI) is suspected, the engine transitions to the Jelliffe/Chen Kinetic GFR mathematical model, correcting for the physiological lag in serum creatinine accumulation.
Because creatinine is a byproduct of muscle mass, CG calculations are highly sensitive to weight. The engine enforces the standard clinical safety protocol:
• If Actual Weight < Ideal Body Weight (IBW), use Actual Weight.
• If Actual Weight is normal/slightly elevated (100% - 120% of IBW), use IBW.
• If Actual Weight is obese (> 120% of IBW), use Adjusted Body Weight (AdjBW) to prevent supratherapeutic clearance estimations.
Standard eGFR formulas assume a mathematical steady state. In acute kidney injury, true glomerular filtration drops instantly, but serum creatinine can take 48 to 72 hours to accumulate in the blood. If a patient's SCr rises from 1.0 to 1.5 in 12 hours, their steady-state eGFR might read as 45 mL/min, but their actual instantaneous clearance (Kinetic GFR) is approaching 0 mL/min. Relying on standard eGFR during dynamic flux guarantees toxic drug accumulation.
