Thank you for your response I should have given more detail. I am a sixty year old male and my nephrectomy was a little over a year ago. I am constantly seeing my doctor. I just saw him yesterday when he gave me my creatinin results (1.9). He said "It is a little high, we will have to keep an eye on it" He is a good doctor but many times he has stated something that refers to me of having one kidney left not both. I think 1.9 maybe normal for a person with one kidney but not for two. I am concerned because my Vitamin D level is also very low even know I am taking 50,000 units every Tuesday. I believe the kidney makes the vitamin D. I am sorry if it sounds like I don't know what I am talking about, I don't. That's why I am on this forum. Thank You