A blood test is performed to measure creatinine levels in your blood.
Estimated Glomerular Filtration Rate (eGFR) is a calculation to see how well your kidneys are filtering. The equation uses the level of creatinine in your blood to determine your eGFR.
In early stages of disease, cysts are forming in your kidneys, but your kidneys can work harder to keep the kidneys functioning.
Therefore, early in the disease, your blood test may not tell you how much damage your kidney really has.
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