if you don't pass as a obstetrician can you be a Rn nurse?

I was wondering if I don't pass as a obstetrician doctor do you still have to take a test to be a Rn ?

View this post on my blog: http://travelnursesuccess.com/if-you-dont-pass-as-a-obstetrician-can-you-be-a-rn-nurse