@reecie1950 Welcome to Mayo Clinic Connect. Have you sought the care of a nephrologist [kidney care specialist] yet? Decreases in eGFR can be caused by kidney disease brought on by the two main causes of high blood pressure and diabetes, or factors like genetic tendencies, lifestyle choices, etc. Basically, doctors will look at trends rather than a specific lab result, unless there is an acute situation. Also, hydration can play a big part in the test results, as can a different in the actual laboratory/equipment used to process the samples.
Ginger