A variety of resources are available to assist providers to better understand the implications of genetic testing results.

ClinVar
ClinVar is a freely accessible, public archive of reports detailing the associations between human variations and phenotypes, with supporting evidence.

GeneTests
GeneTests is a medical genetics information resource developed for physicians, genetic counselors, other healthcare providers, and researchers.

NIH Fact Sheet: Genetic Testing for Hereditary Cancer Syndromes
This is a broad overview of the topic and may be useful for educating patients or office staff about the subject. 

Online Mendelian Inheritance in Man
This database of human genes and genetic disorders is provided by the National Center for Biotechnology Information, a division of the National Library of Medicine at the National Institutes of Health.