my husband uses a little pocket book called "RN Notes" he really likes it. He is a new grad and it has lab values, EKG interpretations, assessment tools, medication therapy, trauma, ER, CC, ect. It seems like a little catch all pocket book. His clinical instructor told him about it.
You can go to amazon
.com and type in something to the effect of "nursing info pocket books" and that should bring up what you are looking for. Also Barnes & Noble (our does anyway) has a nursing section and there are pocket books there too. They have them for all kinds of different specialties peds, trauma, ER, and they have the "catch all" kind like my husband uses. Actually my husband also uses a medication reference book too. It is like a condensened version of a PDR and he really like that too. I can't remember what it is called though. Anyway they are both relatively small and are desgined to fit in your scrub pockets. Hope that helped! Good luck!