I think they were likely referring to your creatinine level. Creatinine is a measure of kidney function with most peoples ideal number being around .6 or so I think. I run a little higher due to paralysis and low muscle mass. I have lupus nephritis, but fortunately my kidney function is still very good. I think your going to a nephrologist is a very good idea with the protein and blood in urine, and the creatinine being high (I am assuming yours was a bit high recently). Good luck.