For the most accurate results, both groups of tests-1st-trimester tests and 2nd-trimester tests-are done, and results from both are analyzed together. However, if couples want information sooner, they can request a type of screening that provides results during the 1st trimester. Couples should remember that screening tests are not always accurate. They may miss abnormalities, or they may indicate abnormalities when none are present. High-level prenatal testing and genetic counseling are available in our Prenatal Testing and Fetal Diagnostic Centers.
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You can eat and drink normally before both the blood test and the ultrasound exam. During the blood test, a member of your health care team takes a sample of blood by inserting a needle into a vein in your arm.
The blood sample is sent to a lab for analysis. You can return to your usual activities immediately.
If you have agreed to have screening for Down's syndrome, the dating scan and the screening will usually happen at the same time. Find out more about the combined screening test for Down's syndrome. You will not be offered the combined screening test if your dating scan . Combined 1st- and 2nd-trimester screening For the most accurate results, both groups of tests-1st-trimester tests and 2nd-trimester tests-are done, and results from both are analyzed together. However, if couples want information sooner, they can request a type of screening . Screening tests, like the Alpha-Fetoprotein Test do not look only at results from the blood test. They compare a number of different factors (including age, ethnicity, results from blood tests, etc) and then estimate what a person's chances are of having an abnormality.
For the ultrasound exam, you'll lie on your back on an exam table. Your health care provider or an ultrasound technician will place a transducer - a small plastic device that sends and receives sound waves - over your abdomen. The reflected sound waves will be digitally converted into images on a monitor.
Your health care provider or the technician will use these images to measure the size of the clear space in the tissue at the back of your baby's neck.
Your health care provider will use your age and the results of the blood test and ultrasound exam to gauge your risk of carrying a baby with Down syndrome or trisomy Other factors - such as a prior Down syndrome pregnancy - also might affect your risk.
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First trimester screening results are given as positive or negative and also as a probability, such as a 1 in risk of carrying a baby with Down syndrome. First trimester screening correctly identifies about 85 percent of women who are carrying a baby with Down syndrome.
About 5 percent of women have a false-positive result, meaning that the test result is positive but the baby doesn't actually have Down syndrome. When you consider your test results, remember that first trimester screening indicates only your overall risk of carrying a baby with Down syndrome or trisomy A low-risk result doesn't guarantee that your baby won't have one of these conditions.
Likewise, a high-risk result doesn't guarantee that your baby will be born with one of these conditions. If you have a positive test result, your health care provider and a genetics professional will discuss your options, including additional testing. For example:.
Your health care provider or a genetic counselor will help you understand your test results and what the results mean for your pregnancy. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. This content does not have an English version.
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This content does not have an Arabic version. Overview Nuchal translucency measurement Open pop-up dialog box Close.
Diagnostic tests will usually involve amniocentesis or chorionic villus sampling, which take a small amount of fluid or tissue from around the baby for chromosomal analysis. Final results from the chromosomal analysis may take weeks. We will discuss the results with you and assist you in deciding about diagnostic tests, such as CVS or amniocentesis.
The reasons to pursue further testing or not vary from person to person and couple to couple. Performing further testing allows you to confirm a diagnosis and then provides you with certain opportunities:. Some individuals or couples may elect not to pursue testing or additional testing for various reasons:.
It is important to discuss the risks and benefits of testing thoroughly. We will help you evaluate if the benefits from the results could outweigh any risks from the procedure.
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Combined first trimester screening test involves an ultrasound scan and a blood test at +6 weeks pregnancy. The ultrasound examines the fluid-filled space at the back of a baby's neck, called nuchal translucency (NT), and the development of the baby's nasal bone (NB).Missing: dating clinic. a dating ultrasound scan is required to allow accurate planning. Figure 1. First trimester combined screen laboratory report Key details to check: 1. Patient details and date of birth and weight A first trimester combined screening laboratory report is illustrated in . Combined First Trimester screening or NT scan Also known as the Combined screening or NT scan. We are only unit in north India who are accredited to perform the First Trimester Down Syndrome Screening according to the standards laid down by the Fetal Medicine Foundation UK.
Gate No. Information for healthcare professionals Read more. Mrs X, 29 years of age Primigravida with For appointments Call 91 or use our online form.
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Combined screening requires the measurement of nuchal translucency, which should be performed when the CRL is between and mm. Uncertainty exists as to how best to combine the BMUS dating.
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Nuchal Translucency Scan - First Trimester
Fetal Medicine Services. Our Prenatal Testing Center offers high-level testing and evaluation services, including Biophysical profiles Provides information about fetal well-being, by assessing fetal breathing, movement, tone, heart rate and amount of amniotic fluid.
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Non-stress test Monitors fetal heart rate response to normal fetal activity such as kicking or movement. Amniotic fluid index Measures the amount of amniotic fluid.
Preparing for Pregnancy If you aspire to motherhood, you should know that obstetricians advise women to prepare for pregnancy several months in advance. Tell your physician about any prescription, over-the-counter and herbal remedies you take, as they may pose risk of the growth of your baby.
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Customize your weight and exercise. Discuss with your physician what type of exercise and diet regimen is right for you.
Eating a well-balanced diet, including fruits, vegetables and protein, and limiting sweets and caffeine is suggested.