Hi pb, i used to be a assistant practioner in a urology clinic so i know a little bit about everything
, so one EGFR test is not the end of the world, you need a series of them done 2 or 3 at best, mine was low once then next test bounced back up.
The human body is a funny old chap really, you see we have these these lab values that are a snap shot of the population, and we call normal the ones in a bracket lets say with EGFR it is 90> this mean anything above 90mmols is normal range, but lets say the guy or girl below the reference range the lab uses stays at 80 for the rest of their life and this never causes an issue, EGFR is a good tool but that is all it is, and it can be affected by many things, body mass, hydration, electrolyte balance to name a few, gold standard is a 24HR urine test, but i digress you are not at that point yet as a repeat may show you bounce back up
. Google is an idiot, and the american health organisation is unlike the NHS dependant on selling poeple medical treatment, procedures, and meds, they pay Google vast sums of money to put medical information without taking into consideration patient history at the top of searches, so stop the Googling as it doesnt know your background or very very unique anatomy.
I hope this helps, and get the test done
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God Bless.