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Genetic Testing/Screening



Genetic testing involves examining your DNA, the chemical database that carries instructions for your body's functions. Genetic testing can reveal changes (mutations) in your genes that may cause illness or disease.

Although genetic testing can provide important information for diagnosing, treating and preventing illness, there are limitations. For example, if you're a healthy person, a positive result from genetic testing doesn't always mean you will develop a disease. On the other hand, in some situations, a negative result doesn't guarantee that you won't have a certain disorder.

Talking to your doctor, a medical geneticist or a genetic counselor about what you will do with the results is an important step in the process of genetic testing.


Why it's done

Genetic testing plays a vital role in determining the risk of developing certain diseases as well as screening and sometimes medical treatment. Different types of genetic testing are done for different reasons:

  • Diagnostic testing. If you have symptoms of a disease that may be caused by genetic changes, sometimes called mutated genes, genetic testing can reveal if you have the suspected disorder. For example, genetic testing may be used to confirm a diagnosis of cystic fibrosis or Huntington's disease.

  • Presymptomatic and predictive testing. If you have a family history of a genetic condition, getting genetic testing before you have symptoms may show if you're at risk of developing that condition. For example, this type of test may be useful for identifying your risk of certain types of colorectal cancer.

  • Carrier testing. If you have a family history of a genetic disorder — such as sickle cell anemia or cystic fibrosis — or you're in an ethnic group that has a high risk of a specific genetic disorder, you may choose to have genetic testing before having children. An expanded carrier screening test can detect genes associated with a wide variety of genetic diseases and mutations and can identify if you and your partner are carriers for the same conditions.

  • Pharmacogenetics. If you have a particular health condition or disease, this type of genetic testing may help determine what medication and dosage will be most effective and beneficial for you.

  • Prenatal testing. If you're pregnant, tests can detect some types of abnormalities in your baby's genes. Down syndrome and trisomy 18 syndrome are two genetic disorders that are often screened for as part of prenatal genetic testing. Traditionally this is done looking at markers in blood or by invasive testing such as amniocentesis. Newer testing called cell-free DNA testing looks at a baby's DNA via a blood test done on the mother.

  • Newborn screening. This is the most common type of genetic testing. In the United States, all states require that newborns be tested for certain genetic and metabolic abnormalities that cause specific conditions. This type of genetic testing is important because if results show there's a disorder such as congenital hypothyroidism, sickle cell disease or phenylketonuria (PKU), care and treatment can begin right away.

  • Preimplantation testing. Also called preimplantation genetic diagnosis, this test may be used when you attempt to conceive a child through in vitro fertilization. The embryos are screened for genetic abnormalities. Embryos without abnormalities are implanted in the uterus in hopes of achieving pregnancy

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What conditions can genetic screening identify?

Genetic screening can identify a vast number of diseases for which you might be at risk due to inherited qualities, including:

  • Lynch syndrome, which increases your risk of colon cancer and various GI and non GI cancers

  • Familial Adenomatous Polyposis, which increases your risk of colon cancer and various GI and non GI cancers

  • High cholesterol, which increase your risk of metabolic syndrome, NASH and liver cirrhosis

  • Hemachromatosis, which increases your risk of liver cirrhosis and liver cancer

  • Celiac disease 

Dozens of other conditions can also be screened with testing. Talk to Dr. Zheng to determine if the procedure makes sense for you.

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What are the benefits of genetic testing?

Genetic testing provides you with a lot of insight into your health. You may get some relief if you’re uncertain about your future health. Results of genetic testing also help the doctors make recommendations for treatment or monitoring, so you can reduce your risk of developing a disease.

If you want definitive answers about your health, talk to Dr. Zheng about genetic testing. Call the office or schedule using the online booking tool today.

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