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In chronic kidney disease it is often necessary to adapt dosage of medication according to capability of the kidney.
Glomular Filtration Rate (GFR) can be used as a basis for calculating optimum dosage and is widely used as a marker for kidney function. Typically this will be done by measuring creatinine clearence.
If you do not know your current GFR, an estimated GFR can be calculated. The National Kidney Foundation provides an online tool for this calculation. Notice that you will still need certain laboratory findings like Serum Creatinine and Serum Cystatin C for this formula.