Q. What is Horizon Carrier Screening? A: Horizon looks at your genes to see if you’re a carrier for up to 274 autosomal-recessive and X-linked genetic conditions. Every one of us is a carrier for 4-6 changed genes that, if inherited in a double dose, could cause a genetic disorder in our children. These disorders are rare and usually there is no family history, although certain disorders are more common in certain ethnic groups. For most of these conditions, both parents have to be carriers for their children to be at risk (these are called autosomal recessive disorders). Others are inherited from a mother who is a carrier (these are called X-linked disorders) and mainly affect boys. Testing to see if you or your partners are carriers for genetic disorders is your choice, but this is testing that is usually offered to all women who are thinking about becoming pregnant, or who are already pregnant. Horizon carrier screening offers testing for many of the most common genetic disorders. You can choose to be tested for only 1 or 2 disorders or for as many as 274. Q: Who should have Horizon Carrier Screening?A: Anyone who is pregnant or planning a pregnancy can have Horizon carrier screening. Additionally, people who are thinking about donating eggs or sperm usually have carrier screening. Ask your doctor or genetic counselor if Horizon carrier screening is right for you. Please note this testing is not available to minors in some cases. Horizon carrier screening for X-linked disorders is limited to female patients. Q: When should I have Horizon Carrier Screening?A: Many couples consider having carrier screening before they become pregnant. If they are found to be at risk to have a child with a genetic disorder, they could choose to use in vitro fertilization, test the embryos for the disorder, and only transfer embryos predicted to be unaffected. If a woman is already pregnant, she and her partner can have Horizon carrier screening at any time. Most couples are found to be at decreased risk to have a child with a serious genetic disorder. Couples who are at increased risk have the opportunity to learn about the condition and plan the care of the pregnancy. Q: What are the benefits of having Horizon Carrier Screening?A: Horizon can help you and your partners learn about the chance to have a child with a genetic disease before or during pregnancy. Many people do not know they are a carrier for an inherited genetic disease until they have an affected child. While there is no test that can screen for all possible genetic diseases or birth defects, genetic carrier screening can give you information to make reproductive choices that are right for you and your family. Q: Do I need to have carrier screening more than once?A: Carrier screening is usually done once as your carrier status for a specific condition typically does not change. Depending on what you have been screened for in the past, your doctor or genetic counselor may recommend additional carrier screening for more conditions. So, it is possible to have carrier screening more than once. Ask your doctor or genetic counselor to find out what’s best for you. Q: What if I have a family history of genetic disease?A: It is important to tell your healthcare provider about your family history. They may suggest you meet with a genetic counselor to review your history and discuss options for further testing. A Horizon carrier screen may be suggested as one way to see if your family history is a risk factor for your children. Q: What is the chance I could have an affected child if I am a carrier?A: If you and your partner are both carriers for the same recessive genetic disease, you have a 1 in 4, or 25%, chance of having an affected child in each pregnancy. If a woman is a carrier of an X-linked disease, she has up to a 50% chance of having an affected child in each pregnancy. Q:Can my partner and I get screened at the same time?A: You and your partner are welcome to have carrier screening at the same time. This should lessen the wait time for results if one partner is found to be a carrier and your doctor recommends the other partner have screening also. Remember, for autosomal recessive conditions, both partners must be carriers for the SAME condition in order to be at risk of having an affected child. Another choice is for the female partner to have carrier screening first. If she is found to be a carrier, then the male partner can be screened for the same condition. Your doctor or genetic counselor can recommend what’s best for you. Q:Do I have to have the full Horizon carrier screening panel?A: No. Your doctor can order Cystic Fibrosis, SMA, and Tay-Sachs Enzyme individually. Your doctor can also choose from several Horizon screening panels in which a number of diseases are screened for at the same time. |