So Confused

[felicia22]

Hi there! I have recently visited with my doctor for a routine check-up. He called me with lab results and said that everything looked normal. I have been having some ankle swelling lately that I was a little concerned about. The nurse emailed my "normal" results to me and I saw that I had a bun of 2.1 and a eGFR of 55. The more that I research the more I see that it's not normal. How accurate is the GFR test?