Polly, in my local Trust area, a creatinine of 45-84 would be regarded as perfectly normal - normal range here is quoted as 49-90 umol/L. An eGFR of 65 (age can be taken into consideration), would also be considered normal - certainly nothing that would interest a kidney consultant. I would say, yes, you are "worried over nothing"! Trust your GP when he says all is normal.
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