My mother is 73 years old. Recently she checked her creatinine and bun. Creatinine result is 1.2 (reference lab rang .6-1 for females) and her bun is 15 which falls under normal lab range. Is her creatinine high, should I consult a nephrologist. She is taking tazloc am 40 for blood pressure and recently due to high hba1c, endocrinologist gave her metformin 500 sr. Is she suffering from chronic renal problem and should I consult a nephrologist?