Re: what is ccrn exam?
You have to have something like 1750hrs of ICU experience to be eligible to take the CCRN exam. Check the website, I'm not for sure about the number of hours. But it is HOURS of beside care, not simply years worked in teh ICU. If you are applying to CRNA school you also MUST have at least 1 yr of ICU experience. It's the 'rules' that all accredited schools must abide by. They are allowed to decide what they consider ICU expderience, (Stepdown, ER, etc., besides "ICU" units) but you must have that minimum 1 yr experience by matriculation. I can tell you that med/surg will not be considered ICU experience. If you have ICU experience in the past, some schools say it must be within so many years (don't quote me, but they want to make sure you weren't in the ICU 20 yrs ago and haven't been back since) of application.
You need to work where you have experience with vents and vasoactive drips and sedative drips, etc., invasive monitoring, art lines, fun things like that

Do you have a BSN? or an ASN with a related BS degree? you'll need that. Check out the AANA web site, and the web sites for specific schools you are interested in to see what you need to be a good candidate. Not all schools require the CCRN, though even if it's not required it's usualy "recommended". Good luck to you. Do some more research, online, shadowing CRNA, so you know how to plan. It's way more than just needing the CCRN.
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