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Utah Employment Laws on medical leave? - utah medical malpractice attorney

I'm 20 and I work in a restruant in Utah. I was sick last month with kidney problems. I went to work as much as possible. Last night I went to work, and he did it well, but today I do not feel grown. They asked me to find someone to cover my shift, but I can not find anyone. Is it possible that I may not go ahead, but also with a certificate to the attention of my absence?

Advice please.