R

Rate of perceived exertion: physical activity self assessment tool used to indicate the level of exertion as perceived by the individual.

Renal complications: deterioration of kidney functioning associated with inadequate diabetes control over time.

Rest pain: the experience of pain when not moving.

Retinopathy: degenerative disease of the retina.

ROM: range of movement.

Rubor: redness, one of the cardinal signs of inflammation.