What is the test for impairment or impairments in the medical field?

1382c(a)(3)(A); see also Barnhart v. Thomas, 540 U.S. 20, 23 (2003). The impairment or impairments must result from anatomical, physiological, or psychological abnormalities that are demonstrable by medically accepted clinical and laboratory diagnostic techniques and must be of such severity that the claimant is not only unable to do her previous work, but cannot, considering her age, education, and work experience, engage in any other kind of substantial, gainful work that exists in the national economy. 42 U.S.C. 423(d)(2)-(3), 1382c(a)(3)(B), (D).