Citrobacter koseri >100,000 colony forming units per mLI had no symptoms of a UTI other than the color of my Urine turned to an Amber color. I forced fluids for a few weeks and when there was no change, went to my PCP for a Urinalysis. I had experienced left lower back pain that flanked and very painful. I thought I may be trying to pas a Kidney Stone. My regular Urinalysis was 90% Flagged so my Urine was sent to a Microbiologist. That was also nearly all Flagged. My PCP started me on an antibiotic - Nitrofurantoin Mono, 100 Mg Cap, 2 a day for 7 days. That was 4 days ago. Today I showed a New Test Result in My Chart. They had done a culture & it came back showing “citrobacter koseri - >100,000 colony forming units per mL Flagged I am 73 years old, have not been sexually active for 15 years and maintain excellent hygiene. It’s the weekend and we are scheduled to go out of town tomorrow for a 4 day visit with family. When I pull this up, it’s confusing, and nowhere can I find what the NORMAL colonies forming units per mL should be. I do have autoimmune diseases. Adrenal Insufficiency and Parkinson’s Disease. Can anyone shed any light on this & specifically, what is normal? My UTI appears the same. No pain, urge to urinate and a good flow. Still amber in color. I drink 8+ glasses of water a day and am not prone to repeated UTI’s. ANY help would be so gratefully appreciated!