A computer implemented method, system, and/or computer program product creates a suggested diagnostic test selection. A description of a current patient includes a current medical complaint, medical history, and physical examination result for the current patient. A cohort for the current patient is made up of persons who have a substantially similar medical complaint, medical history, and physical examination result as the current patient. Past diagnostic test sets used to make correct medical diagnoses for persons in the cohort are identified and stored in a cohort diagnostic test database. The past diagnostic test sets are sorted based on increasing levels of detrimental effects posed by each of the past diagnostic test sets. The sorted diagnostic test sets are then presented to a health care provider for the current patient.