i was just curious, if after years of doing EM one wanted to specialize or something like ICU or Resp Critical care, or some IM subspecialty, what credit would one get? would they be able to enter it directly? I ask b/c i know a doctor, whom was a surgeon for 10 or so years, then decided he was bored of it, and wanted to do something different, so he did a pulmonary critical care, but he didnt have to do IM residency at all, he just went straight into the subspecialty. I guess there are no absolute set criterias for changing specialties, or subspecializing, i guess it depends on the place? just thinking way ahead like 10 20 years, if i get burnt out, or bored. i doubt it though, just curious.