@rbennett You paint a small picture of the problem. It sounds like you are working with a PCP, not nephrologist. Things to consider: 1) What about the rest of your labs? There is usually a reason for CKD. 2) Creatinine eGFR tests often vary. 3)You were dehydrated at the time of testing. When tested, always be hydrated.4)You were taking creatinine supplements. This may typically lower temporarily your eGFR score. 5)Eating an overabundance of red reat could have an effect as well.6) Taking an ultrasound may alleviate some fear. Summarizing, you appear to have all the symptoms of a lower eGFR only because of your habits prior to testing. One eGFR is wakeup call, but the true measure of CKD is your "trend" over time. I would follow up with your doc suggestion with an ultrasound. On your next test be hydrated, avoid large meat quantities, make an appointment with a nephrologist, and look at the whole lab picture and not one lab score. Our mentor, @gingerw, can add to my response in case I missed something.