The requirements vary from state to state and often from school to school. In Florida, we have the following state-madated college level prerequisites that we have to have done
before entering a nursing program (link):
http://www.fgcu.edu/chp/nursing/bsn-prereqs.html
(note that the page says you have to have 60 credit hours, that is just for a 4 year BSN program, 2 year ADN programs would generally only require the prerequisites listed in the chart (about 30 hours), but not 60 full hours).
Hope that helps.
Nursing News