Hello Carrie, I have found there are several things that can affect eGFR. Those numbers are all above 60 so to a Urologist probably won't be too concerned. My Urologist only cares if you have eGFR below 60 for the past several tests.
I have had eGFR range from a high of 90 to a low of 63 within a 6 month period. I do some weight training and have found that if you lift weights within 48 hours it will raise your creatinine levels (which are used in arriving at eGFR). If I don't hydrate properly then my creatinine levels are also higher. Consuming a lot of protein will also raise creatinine and lower eGFR.
A combination of being well hydrated and not lifting weights for the preceeding 24 hours (*or any large muscle straining) and not eating a lot of red meats the day before the blood draw has a huge effect on eGFR. I have verified that those 3 things can (did in my case) raise your eGFR 20 points or more.
Also, age matters. If you google you can find a chart that lists eGFR that is normal by age/gender. The older you are the lower the number normally is. Lower your creatinine and raise your eGFR. here is a link to a calculator for eGFR: http://nkdep.nih.gov/lab-evaluation/gfr-calculators/adults-conventional-unit.asp
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