Genetic testing is a type of medical test that identifies changes in chromosomes, genes, or proteins. Genetic screening is the application of a test on people for the systematic early detection or exclusion of a hereditary disease, a genetic predisposition to a disease, or to determine whether a person carries a predisposition that may produce a hereditary disease in their offspring.
Useful links:
https://www.mayoclinic.org/tests-procedures/genetic-testing/about/pac-20384827