About the partial birth abortion issue...

When McCain brought up the question of “health” of the mother Chris Matthews thought it was insulting to women. I’m a woman and a democrat, but it still made me want to know what “health” issues would someone legally be able to consider when contemplating a late term abortion. Non-life threatening health issues, in my mind should be off the table. Heck, a baby can survive when born at 6 months! What is the legal test for “health?” Are stretch marks “unhealthy?” How about depression, how severe must it be? This issue won’t make me vote for McCain, but I think the press (MSNBC anyway) was to quick to just write off the question. Any answers?