Global Genetic Testing Services Product Types In-Depth: , Prenatal Testing, Newborn Screening, Predictive and Presymptomatic Testing
, Pharmacogenomic Testing
* Predictive or presymptomatic testing
can be offered to asymptomatic individuals to refine their risk of developing a condition later in life.
Indeed, the presymptomatic testing
revealed two asymptomatic carriers of the pathogenic mutation, both of them underwent surveillance colonoscopy and were found to carry precancerous lesions.
(2) Presymptomatic testing
of minors is considered appropriate given the age of onset of symptoms and the possibility of serious complications before the age of 18 years.
Tanguy et al., "Long-term outcome of presymptomatic testing
in Huntington disease," European Journal of Human Genetics, vol.
Middle-and long-term anxiety levels resulting from presymptomatic testing
of HD, MJD and FAP neurodegenerative diseases.
The facile PCR-based assay that we have described could be used to confirm the diagnosis of BHD, or for presymptomatic testing
of members of the extended BHD family.
There are two types of predictive genetic testing- Presymptomatic Testing
& Susceptibility Testing.
This may present a better alternative to using CGG sizing as a first-line test in newborns or very young children, because detection of PM alleles that have been associated with late-onset disorders (30, 31) would raise the ethical issue of presymptomatic testing
for currently untreatable and nonpreventable disorders with incomplete penetrance (32).
Gene testing is currently used in the health care arena for carrier screening, preimplantation genetic diagnosis, prenatal diagnostic testing, newborn screening, presymptomatic testing
for predicting adult-onset disorders, presymptomatic testing
for estimating the risk of developing adult-onset disorders, and confirmatory diagnosis .
Testing for germline disorders in advance of the patient showing any signs of the disease (presymptomatic testing
) raises other issues that may be difficult for the patient to address.