Molecular analysis of gene mutations that are connected with an increased risk of developing certaindiseases (i.e. hereditary cancers, heart diseases). Such tests include the BRCA1 and BRCA2 genes for families with breast and ovary cancer history, the APC gene for Familial Adenomatous Polyposis and families with colorectal cancer history and the genes RET and MEN1 with families with multiple endocrine neoplasia syndromes