This is of considerable concern to me, how old are you? If you're under fifty, an RFC of sedentary will very likely result in a denial of your claim! If over fifty its not quite so negative. If under fifty you need an RFC of "less then sedentary" to prevail. Your primary doctors medical files need to substantiate a claim of less then sedentary, meaning they need to reflect an ongoing treatment protocol and detailed documentation along with subjective medical testing supporting such a claim.