Genetic Screening

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© 2013, The Columbia University Press.

Selected full-text books and articles on this topic

Risk, Age and Pregnancy: A Case Study of Prenatal Genetic Screening and Testing
Bob Heyman; Mette Henriksen.
Palgrave, 2001
Future Perfect: Confronting Decisions about Genetics
Lori B. Andrews.
Columbia University Press, 2001
Children of Choice: Freedom and the New Reproductive Technologies
John A. Robertson.
Princeton University Press, 1994
Librarian’s tip: Chap. 7 "Selection and Shaping of Offspring Characteristics: Genetic Screening and Manipulation"
Genes: A Philosophical Inquiry
Gordon Graham.
Routledge, 2002
Librarian’s tip: "Genetic Screening" begins on p. 93
Genetic Privacy: A Challenge to Medico-Legal Norms
Graeme Laurie.
Cambridge University Press, 2002
Librarian’s tip: "Genetic Information and Testing" begins on p. 101
Genetic Knowledge: Human Values and Responsibility
Jacquelyn Ann K. Kegley.
ICUS, 1998
Librarian’s tip: "The Present State of Genetic Knowledge and Implications for Genetic Screening" begins on p. 113
Encyclopedia of Reproductive Technologies
Annette Burfoot.
Westview Press, 1999
Librarian’s tip: Chap. Five "Genetic Diagnosis"
Prenatal Genetic Screening: The Enigma of Selective Abortion
Stoller, David.
Journal of Law and Health, Vol. 12, No. 1, Spring 1997
Multiplex Genetic Testing
.
The Hastings Center Report, Vol. 28, No. 4, July-August 1998
Genes and Insurance: Ethical, Legal, and Economic Issues
Marcus Radetzki; Marian Radetzki; Niklas Juth.
Cambridge University Press, 2003
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