You usually see it buried in a doctor's note, a disability form, a workers' comp file, or a letter saying you can do "sedentary work," "light work," or only certain tasks. That's residual functional capacity: a blunt assessment of what a person can still physically or mentally do after an injury, illness, or disabling condition. It is not about whether someone is fully healed. It is about what is left - how long they can sit, stand, walk, lift, focus, use their hands, follow instructions, or keep up a normal work pace.

This matters because insurance companies, employers, and government agencies use it to put a ceiling on your claim. If the paperwork says you can work six hours, lift twenty pounds, or handle simple tasks, expect somebody to argue you are not as disabled as you say. If the RFC is too optimistic, it can wreck a disability claim, cut off wage-loss benefits, or push someone back to work before their body is ready.

In an injury case, RFC evidence can also strengthen a claim for lost earning capacity and daily-life limitations. Oregon does not have a special RFC statute for personal injury cases, but those limits still matter when proving damages. And because Oregon voters have repeatedly rejected ballot measures to cap non-economic damages, solid proof of reduced function can carry real weight.