After reading the posts about c cystatin being more a more accurate kidney function test, I received the results yesterday. 🙂 Rather than eGFR 27 and 4 stage, I’m GFR 35, 3rd stage. That may seem small, but it’s huge for me. My nephrologist encouraged me to eat normally, I rarely eat processed food. She said don’t be afraid of potassium and my salt level was below normal on my results. Albumin is normal. My protein comes from beans/rice, vegetables, nuts and seeds and dairy. I’m not a vegetarian but I rarely eat meat. My healthcare system does not do c cystatin tests. They had to send it out, CA I think. Why is c cystatin such a difficult test? I’m not sure it’s covered by Medicare.