Prenatal screening allows us to estimate the chance that your baby has certain defects. The higher the age of the mother, the higher the risk of these defects. During the first appointment, we will give you elaborate information, and we will answer your questions. It can be a difficult decision whether or not to do prenatal screening. That is why we recommend you to read some information about prenatal screening before your first appointment.
At our practice on the Scheveningseweg, we offer ultrasound imaging. You can make an appointment for the vitality and the due date ultrasound, the ETSEO and the 20-week ultrasound as well as for the NIPT test. This appointment can be followed by a checkup with your midwife to discuss the preliminary results.
DNA of the unborn child is present in the blood of all pregnant women. This knowledge was the basis of a non-invasive prenatal test that tests the DNA in the blood of the mother for chromosomal abnormalities of the child. This test is very reliable and safe. The NIPT can be done at 10 weeks pregnant and onwards. All we need is two vials of blood of the mother-to-be. The result can be normal or abnormal. An abnormal result of the NIPT could indicate the presence of the trisomy 21, 18 or 13. However, it is also possible that an abnormal result is not an indication of a baby with trisomy 21, 18 or 13. Therefore, in case of an abnormal result, to be certain, we need to do follow-up invasive tests. These tests are called a chorionic villus sampling test and amniocentesis. One of these tests is necessary to confirm the NIPT result.
Most NIPT results are normal. In case of a normal result, the chance of a baby with a trisomy is so small (smaller than 1 in a 1000) that we do not recommend to do a follow-up test. If pregnant women with a higher chance of a trisomy do the NIPT test and the result is normal, a chorionic villus sampling test or an amniocentesis are also not necessary. In 2% of women who do a NIPT test, the test fails and needs to be repeated. If the test fails a second time, a combined test, chorionic villus sampling test, or an amniocentesis is necessary.For more information, see the folder on prenatal screening on screening for down-, edwards- en patausyndrome.
As of April 1, 2017, the NIPT is the first screening test available to all pregnant women in the Netherlands. You can choose the NIPT test directly through the Trident 2 study. This study runs for at least three years. The goal of the study is to find out whether the NIPT being the first screening test available to all women in the Netherlands is desirable and cost-effective. The costs for the NIPT as part of this study are € 175,- (2019).
Before doing the NIPT, we like to see you for an appointment for counseling. You will also be asked to sign a consent form to enroll in the Trident 2 study. The NIPT has to be paid in advance and you have to be at least 11+0 weeks pregnant. We need to do an ultrasound or hartbeat check to confirm that the baby is vital. This check has to be done within a week before taking the blood sample. Before you have your blood drawn, you must show proof of payment (printed) and submit the application form for the blood sampling. We are obligated to save the original consent form for 15 years.If you participate in the Trident 2 study, the result will not show the sex of the baby.
|Age of the mother||Chance of a child with Down syndrome|
|20-25 years||1 in a 1000|
|26-30 years||1 to 2 in a 1000|
|31-35 years||2 to 5 in a 1000|
|36-40 years||6 to 15 in a 1000|
|41-45 years||20 to 61 in a 1000|
Please consider whether you want to be informed about any additional results. Beside the trisomies 13, 18 and 21, the NIPT can also detect other trisomies, deletions or duplications of the chromosomes. Such abnormalities could have serious consequences for the health of your child. Whether or not you want to be informed about any additional findings is up to you. If any of the additional results of the NIPT are abnormal, additional invasive diagnostic testing will be done to obtain certainty about the outcome. The result of the NIPT takes 10 workdays. You will get the results of the NIPT from the health practice that referred you. You cannot do both the combined test and the NIPT.
You can participate in the Trident 2 study if you:
You are excluded from the Trident 2 study if: