I have some renal problems but they came about as a result of secondary issues I have had from my RSD like septicaemia.
Creatinine and protein abnormalities can be sometimes as a result of hypertension, smoking, diabetes and sometimes dietery consumption of protein.
The fact that you have a family history of renal problems certainly points to perhaps this being more likely the cause.
There are very many more tests that would give a better reflection of your renal function--I hope he orders those if he is concerned.
Fingers crossed for you Amber