Medical evidence
(1) Medical evidence(i) General. Medical evidence of your impairment(s) must describe symptoms, signs, and laboratory findings. The medical evidence may include, but is not limited to, formal testing that provides information about your development or functioning in terms of standard deviations, percentiles, percentages of delay, or age or grade equivalents. It may also include opinions from medical sources about the nature and severity of your impairments. (See 416.920c.)