Genetic Screening and Testing

genetic testing

genetic testing, medical screening for genetic disorders, by examining either a person's DNA directly or a person's biochemistry or chromosomes for indirect evidence. Testing may be done to identify a genetic disorder a person has, whether the disorder is already evident or not, or to confirm whether or not a person is a carrier of a gene for an inheritable disorder. When a person is being tested for a genetic disorder that he or she may carry or has not yet shown evidence of, the process is often called genetic screening and genetic testing is often one of several elements that make up the screening process.

Prospective parents or an embryo or fetus may be tested when a specific genetic disorder is suspected (e.g., Tay-Sachs or sickle cell disease). In such a case, genetic screening begins with a complete medical history of both parents. If the parents decide to conceive or have already conceived, diagnostic tests, such as chorionic villus sampling and amniocentesis, can be performed on the fetus to detect various genetic disorders. In the case of a positive finding, the parents can elect to abort the fetus. Embryo screening, which uses a single cell to provide the DNA for testing, can be used on an embryo conceived by in vitro fertilization to determine if the embryo is free of genetic abnormalities before it is implanted in the uterus. If a person has an illness or mental retardation of unknown origin, gene-sequencing techniques may be used to check a person's genome for a genetic cause. Researchers have greatly reduced the time required for the gene-sequencing process by using a person's symptoms to refine and focus the search for genetic causes, enabling doctors to begin appropriate treatment more quickly.

As researchers identify more genetic markers for diseases and develop blood tests for them, concern has arisen over the use of such tests to deny people health and life insurance, employment, and the like. A 1993 National Academy of Sciences report called for the establishment of ethical guidelines on the use of genetic testing and screening, and in 1995 the Equal Employment Opportunity Commission said that the use of genetic screening to deny employment could violate the Americans with Disabilities Act. The Genetic Information Nondiscrimination Act, passed in 2008, bars an employer or insurance company from discriminating against a person based on a personal or familial genetic predisposition to a disease or condition.

See also eugenics.

The Columbia Encyclopedia, 6th ed. Copyright© 2018, The Columbia University Press.

Genetic Screening and Testing: Selected full-text books and articles

To Test or Not to Test: A Guide to Genetic Screening and Risk By Doris Teichler Zallen Rutgers University Press, 2008
Genes, Jobs, and Justice: Occupational Medicine Physicians and the Ethical, Legal, and Social Issues of Genetic Testing in the Workplace By Brandt-Rauf, Sherry I.; Brandt-Rauf, Elka; Gershon, Robyn; Li, Yongliang; Brandt-Rauf, Paul W Ethics & Medicine, Vol. 27, No. 1, Spring 2011
Peer-reviewed publications on Questia are publications containing articles which were subject to evaluation for accuracy and substance by professional peers of the article's author(s).
Biomedical Ethics By Walter Glannon Oxford University Press, 2005
Librarian's tip: "Genetic Testing and Screening" begins on p. 97
Practical Decision Making in Health Care Ethics: Cases and Concepts By Raymond J. Devettere Georgetown University Press, 2010 (3rd edition)
Librarian's tip: "Genetic Testing" begins on p. 423, "Genetic Screening" begins on p. 429
Health Care Ethics: A Catholic Theological Analysis By Benedict M. Ashley; Jean K. Deblois; Kevin D. O'Rourke Georgetown University Press, 2006 (5th edition)
Librarian's tip: "Genetic Screening and Counseling" begins on p. 98
Revisiting Wilson and Jungner in the Genomic Age: A Review of Screening Criteria over the Past 40 Years By Andermann, Anne; Blancquaert, Ingeborg; Beauchamp, Sylvie; Dery, Veronique Bulletin of the World Health Organization, Vol. 86, No. 4, April 2008
Peer-reviewed publications on Questia are publications containing articles which were subject to evaluation for accuracy and substance by professional peers of the article's author(s).
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