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Creatinin in the modern evaluation of the kidneys functional condition (literature review and own data)

Glomerular filtration rate (GFR) is a recognized indicator of the functional status of the kidneys. In medical practice, there are various approaches for measuring GFR. However, despite the nearly 100-year history, not all methodological problems of evaluating GFR in clinical practice have been solved. The most physiologically justified (“reference”) methods are not acceptable in routine practice because of the complexity and high cost. Therefore, clinicians have to rely mainly on the results of surrogate methods, most of which use endogenous creatinine as a glomerulotropic test agent. Therefore, the accuracy of determining the concentration of this metabolite in biological media (especially in serum) is often crucially determined by the reliability of the GFR assessment. Manufacturers of creatinine reagent kits should take into account current requirements for accuracy and traceability of measurement results and ensure that their products comply with international standards.