Genetic testing can give you valuable and even life-saving information. But it can also alter your relationships with family members, complicate your insurance and employment status, and confront you with tough, perhaps unanswerable, questions. We hear more about the link between genes and disease everyday. If there is evidence of an inherited condition in your family history, a genetic test may be able to provide you with valuable information. The tests can provide information on your own risk, or your child's risk, for an illness.
There are only a few inherited disorders that can give you a simple yes or no test. The more common test result is an estimate of your risk for developing a disease. The results and the options open to you after your test will vary depending on the particular condition for which you are tested. So take heed before you lift the veil from your genetic profile.
Results aside, other issues that may come up concerning genetic testing include:
And it doesn't stop there. The impact of genetic testing on your life can be like giving a good twist to a kaleidoscope—mostly the same pieces, but what a different image! And once you twist that kaleidoscope, there's no going back to the previous view.
If you are considering having a genetic test, consult with a genetic counselor first. These specially-trained, certified health professionals can guide you through the numerous decisions, interpretations, and options of genetic testing. Most hospitals have certified genetic counselors on staff or you can contact the National Society of Genetic Counselors to find a board-certified counselor in your area.
The first question a genetic counselor can help you with is whether or not to have the test. Karen Johnson, a genetic counselor at Johns Hopkins University, specializes in counseling people who have cancer in their families. Her clients often come to her because they have read something, a family member was recently diagnosed, or their doctor suggested it. Whatever their reasons for considering a genetic test, Johnson says, "More than half of the people I counsel decide not to have the test depending on the condition in question. Often," she adds, "many people have overestimated their risk, and after counseling, better understand what their risk actually is and what options they have."
There are several scenarios in which genetic testing may be considered appropriate:
If you decide to go ahead with the test, a counselor can help you interpret the results and define your options. In some cases, testing positive for a genetic mutation associated with a disease can mean you are virtually certain to develop the disease. In other cases, it may mean only that you might develop the condition. Depending on the disease, there are wide variations in treatments and preventive measures available.
Negative results are no less complex. Johnson did a study that found many people who tested negative for an inherited form of colon cancer stopped being screened for the disease altogether. Johnson says, "It appears that at least some of them misinterpreted the 'negative' results to mean they had no risk for colon cancer. What the test results actually meant was that they had little or no risk for the particular form of colon cancer associated with the particular genetic mutation we tested for."
Genetic testing doesn't affect just you. By definition, this is about families. At the minimum, you will need to provide a detailed and complete medical history of your family. Other family members may need to be tested as well. This is called a linkage test and is used when there is no direct test for a condition. Linkage tests use genetic information from other family members to better identify the genetic marker for a condition. Which, and how many, of your relatives will need to be tested depends on the condition and what its inheritance pattern is. Still other relatives may become involved as you may have to decide whether or not to tell them they are at risk for the illness. Who else will know—and what will they do?
Genetic testing has great power for revealing information that can change the lives of individuals, families, and entire societies. Like many other technologies, genetic testing provides ethical, social, and legal questions about how to balance an individual's right to privacy against society's need to protect itself. Other controversies surrounding genetic testing include sex selection, presymptomatic testing of children, and whether or not to warn third parties or to re-contact patients when new information on their genetic status becomes available.
There is no doubt that for some people genetic testing can be beneficial. But in this "information age," the effects of unintended consequences require as much consideration as do the potential benefits.
Genetics Home Reference
National Society of Genetic Counselors, Inc.
The Society of Obstetricians and Gynaecologists of Canada
Frequently asked questions about genetic testing. National Human Genome Research Institute website. Available at: http://www.genome.gov/19516567. Updated October 13, 2012. Accessed May 2, 2012.
Genetic testing what it means for you and for your family's health. http://www.genome.gov/Pages/Health/PatientsPublicInfo/GeneticTestingWhatItMeansForYourHealth.pdf. Published 2007. Accessed May 2, 2012.
Harrison’s Principles of Internal Medicine . 16th ed. McGraw Hill; 2005.
Weitzel, J. The current, social political, and medical role of genetic testing in familial breast and ovarian carcinomas. Curr Opinions in Obstet Gynecol. 1999;11:65-70.
Last reviewed May 2012 by Brian Randall, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
Copyright © 2012 EBSCO Publishing All rights reserved.
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