Favoritism in the Workplace

I went to work yesterday, my off day mind you, to try and get a little more handson with the new hematology instrument. They called themselves training me for a week. (It was more or less watching the machine while the person assigned to it was off somewhere else doing other things.) I still don't feel comfortable with the machine. Right before it was time to go, I had two specimens that needed extra work. I learned that after all I did, I still wasn't going to be able to accept the results because there was a function error. No one has explained function errors to me. Tomorrow, I am letting them know that I will not run the instrument anymore without being FULLY trained. We will see because I saw they have me scheduled to run it tomorrow BY MYSELF. I had planned on taking a few hours of FMLA to see my doctor and I am pretty sure she is going to pull me out of work.