Both acute and chronic liver diseases have an effect on renal function. After liver transplantation we have to pay attention to the further loss of function because of applied calcineurin inhibitor treatment. It has a nephrotoxic side-effect, so the investigation of renal function is converted into an important mission in liver transplant patients. In our study we compared the results between formulas which use serum creatinine: MDRD, which use albumin too, has effectively other values than the Cockroft-Gault. We compared the two formulas in a retrospective analysis, in 187 patients at a stated time (before operation, after operation, 1 week, 1 month after transplantation). We got higher GFR at each date with Cockroft-Gault: mean difference 19.56%, 17.33%, 37.18% and 28.8%. In the range of 15–60 ml/min GFR, we found nearly twice as many patients by MDRD than by Cockroft-Gault. Median with MDRD: 79 ml/min, 65.1 ml/min, 52 ml/min, 49.5 ml/min; median with Cockroft-Gault: 93.8 ml/min, 78 ml/min, 70.1 ml/min, 69.4 ml/min, all are significant (p < 0.001). Many previous studies have already compared the two formulas in end-stage kidney disease. On the basis of these studies MDRD is also suitable under 30 ml/min GFR, but Cockroft-Gault formula just above it approached the real GFR measured with isotope methods. We got the similar conclusion in the examined patient group. It can be stated that MDRD is more suitable to determine renal function in liver transplant patients.
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