As a Cohen is prohibited from deliberately defiling himself through contact with a dead body, may he enter a hospital where there is a high probability that someone might die and render the Cohen tamei through ohel? I could never get a straight answer for this one. Cited sources with the answer would be much appreciated.
The organisation Vaad Hakohanim puts out useful information on keeping away from tumah for kohanim. Particularly useful is The Kohen's Handbook A complete guide in English to help today's kohen guard his spiritual purity .
Hospitals are a special problem because nearly all contain amputated limbs and other body parts as well as aborted fetuses. The situation is different in Israel to Chutz Lo'oretz because most of the sources of tumah in Chutz Lo'oretz come from non-Jews which leaves room for leniency. But essentially the design of each hospital needs to be studied by a competent Rabbi and the reasons for the visit need to be considered when you CYLOR.