The sight of blood, no. See plenty, and get plenty of it on me, in my job.
I do have an issue with needles and people so no way I could watch a human blood draw... I can do them myself on animals though
Only human blood. I think I can handle it if it is a true emergency, but last time I cut myself on accident I just slapped a bandaid on it and it took about 24 hours to work up the nerve to take a look at it.