Today we have a surveyor in our building measuring siderails. ISDH's latest initiative, coming to a building near you! There are guided to refer Administrators to the FDA website, and I gleaned some basic information at: http://www.fda.gov/cdrh/beds/guidance/1537.html
Here is a handy one page PDF summarizing the information. Feel free to download and use as an inservice with your maintenance staff and/or safety committee.