I had a Cat Scan/with and without contrast, result was I am functioning with one Kidney , My left one not functioning Couple of months ago I have very bad food poising, last all night. Could this possibly be the cause. Doctor says my be a birth defect, may have been there since I was little girl and never pick up. Going to Urologist to see what is going on. What do you think. Please help me. I am a very concern.