What is the test for determining whether a missing or deficient sign or laboratory finding is sufficient to sustain a finding of disability?

your symptoms, signs, and laboratory findings are medically equal to the symptoms, signs, and laboratory findings of a listed impairment, we will look to see whether your symptoms, signs, and laboratory findings are at least equal in severity to the listed criteria. However, we will not substitute your allegations of pain or other symptoms for a missing or deficient sign or laboratory finding to raise the severity of your impairment(s) to that of a listed impairment."). "The mere diagnosis of an impairment listed in Appendix 1 is not sufficient to sustain a finding of disability." Key v. Heckler, 754 F.2d 1545, 1549 (9th Cir. 1985).