<qa>  What is the result of a phenotype-genotype correlation?Phenotype recognition of the range of these rare genetic conditions includes non-invasive and invasive testing to demonstrate the hallmarks of each individual condition, and exclude common causes such as ischemic or idiopathic forms of cardiomyopathy. The outcomes from this type of testing have not been assessed in a systematic fashion in patients with UCA or their family members. Phenotype-genotype correlation is necessary to develop optimal diagnostic testing in probands and screening techniques in their family members, which will result in disease-specific therapy. Genetic testing of patients with an overt phenotype demonstrates a potentially causative mutation in 50-75 of LQTS patients, and 20 of Brugadas Syndrome patients. Despite recognized mutations with phenotypic expression models, 30-80 of patients will have negative gene screening despite overt or latent clinical disease. 