Prenatal tests can help you learn more about your baby before it is born. Genetic testing, for example, can assess the risk of your baby having certain birth defects. Down syndrome, trisomy 18, spina bifida, and other birth defects are some examples.
Screening tests do not provide a diagnosis. They will not be able to know for sure if their child has a birth problem. They will tell you if your child is at higher risk for the most common ones. You may choose to have a diagnostic test if your risk is high. Diagnostic tests can be more invasive at times. As a result, detection is a necessary initial step.
A blood test is used for most tests. Your doctor may order an ultrasound (a picture of the baby). Your doctor will also take into account the mother's age and ethnicity. Other risk factors, such as a family history of birth defects, will be considered. This could indicate that your child is more susceptible to the same problem from birth. This will help you learn more about your baby before it is born. Genetic testing, for example, can assess the risk of your baby having certain birth defects. Down syndrome, trisomy 18, spina bifida, and other birth defects are some examples.
Path to Improved Health
Most prenatal exams are done between 15 and 20 weeks of pregnancy. Primary assessments can be skipped if desired. However, all pregnant women are offered the tests. Some people prefer not to participate in the screenings. The Triple Screen, Quad Screen, and Penta Screen are the top three screening tests that begin with a blood test. Blood tests look for a variety of proteins in the bloodstream.
- Triple test: This test measures three chemicals in the blood of a pregnant woman. These compounds include alpha-fetoprotein (AFP), human chorionic gonadotropin (hCG), and unconjugated estriol.
- Quad screen: In the blood of a pregnant woman, a quad screen measures four things. AFP, hCG, unconjugated estriol, and inhibin A are all examples of this.
- Penta Screen: All of the above, as well as hyperglycosylated human chorionic gonadotropin substance, are measured by a Penta screen.
- Cell-Free DNA: After 10 weeks of pregnancy, this updated blood test can be done. This blood test may be more accurate than others. It takes the baby's DNA and accumulates it in the mother's circulation. These DNA fragments are used to predict the likelihood of a baby's birth defects.
Neither the mother nor the baby is at risk from any of these blood tests. You and your doctor can decide which screening test is best for you if you decide to do one.
Things to Consider
If blood tests reveal that your baby is at increased risk of developing a birth defect, your doctor will order additional tests. These tests include the following:
- High-resolution ultrasound: A level II ultrasound is also known as a level I ultrasound. It delves into potential birth defects. You can determine your baby's age, as well as his brain, spinal cord, kidneys, and heart. It usually ends between 18 and 22 weeks of your pregnancy.
- Chorionic villus sampling (CVS): This is an invasive procedure. Your doctor will remove a small part of the placenta called the chorionic villus. It is screened for chromosomal or genetic abnormalities. People who have an abnormal first-trimester screening test are offered a CVS test. It is also available to people who may be at higher risk. It is completed between the 10th and 12th week of pregnancy.
- Amniocentesis: This is an invasive procedure. Your doctor will remove a small amount of amniotic fluid from the area around the baby. It is tested for certain proteins. This can help you determine if your child has Down syndrome or other genetic problems. Women who had an abnormal pregnancy screening blood test should take it. Between 15 and 18 weeks of pregnancy, it is completed.
Most diagnostic tests are only available to women who have high-risk pregnancies. They include people over the age of 35, people who have had a previous pregnancy affected by a birth defect, people with chronic conditions such as lupus, high blood pressure, diabetes, or epilepsy, and people using specific medications.
If a birth problem is discovered during pregnancy or after birth, your doctor may recommend a genetic counsellor. This is a specialist who can interpret test results, order additional tests, and recommend you to a doctor who specializes in high-risk pregnancies or genetic problems.
Other factors to consider are:
Pregnancy screening tests are a personal decision. Do you want to continue if your detection results are abnormal (positive)? This is a diagnostic procedure. Will it have an impact on how you manage your pregnancy?
Some tests result in false positives. This indicates that your child may not have a birth defect. A false-positive result may or may not influence your decision to take further tests or cause stress. A regular check can give you peace of mind.
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