Yes, you can. The 1st Medical Test is not a hard test, it takes one day only. Now, as for one kidney it is not a sickness that can cause you feeling badly during your job. I had passed after recovery from genetic small disorder, it was a minor one. To prove that the feminie may also become a pilot.As long as you heart is not affected. And I am happy flying occasionally. You must mention in the papers that you do not have one kidney, nothing to hide at all, and you will make it. Melu