Non-invasive prenatal test. We analyze all the 24 chromosomes for the peace of mind of future mothers.
While Neo24 will provide potentially valuable information for any pregnancy, women with the following risk factors should give Neo24 particular consideration:
Testing can take place even in the absence of these risk factors.
Juno Genetics offers a cutting-edge non-invasive prenatal test solution, which examines all 24 types of chromosome. In contrast many other NIPT tests only examine a small number of chromosomes (typically chromosomes 13, 18, 21 and sometimes the sex chromosomes, X and Y). Juno’s Neo24 method is extremely sensitive, delivering one of the highest accuracy rates with the lowest incidence of samples that fail to give a result. The technique used is based upon next-generation sequencing (NGS) technology. A blood sample is taken from the pregnant mother from 10 weeks of gestation. Plasma is isolated from the sample, which contains millions of DNA fragments from the mother and also from the fetus mixed together. These cell-free DNA (cfDNA) fragments are sequenced and a sophisticated analysis is undertaken in order to determine the number of copies of each chromosome.
The analysis reveals the proportion of the cfDNA fragments that come from the fetus and which chromosome each piece of cfDNA originally came from. If an excessive proportion of the cfDNA fragments come from a particular chromosome, this is indicative of the presence of an extra copy of that chromosome. This sort of abnormality, known as ‘trisomy’ is the most common form of aneuploidy seen during pregnancy and explains most miscarriages as well as conditions that can affect liveborn children, such as Down syndrome. Rarer forms of abnormality, such as loss of a chromosomes (monosomy), or abnormalities involving loss or duplication of large pieces of chromosome (>7Mb) can also potentially be detected using the Juno Neo24 test.
Neo24 and Neo24+ are screening tests that only look for specific chromosomal abnormalities. This means that other chromosomal abnormalities may be present and could affect the pregnancy. A “No Aneuploidy Detected” result does not guarantee a healthy pregnancy or baby, and does not eliminate the possibility that a fetus may have birth defects, genetic disorders, or other conditions, such as open neural tube defects or autism. There is a small possibility that the test results might only reflect the chromosomes of the placenta and not those of the fetus (this is known as confined placental mosaicism, CPM).
Additionally, the results of the test may be confused if some of the cells of the mother have an abnormal number of chromosomes. In the case of a twin pregnancy, the presence or absence of Y chromosome material can be reported, but it will not be clear whether both twins are male or just one of them. Furthermore, abnormalities affecting the sex chromosomes cannot be evaluated in twin pregnancies.
Because of the limitations outlined above, no irreversible clinical decisions should be made based on Neo24 results alone. If a definitive diagnosis is desired, chorionic villus sampling or amniocentesis would be necessary.
Neo24 test results are usually available within 5 days of Juno receiving the sample of maternal blood (although up to 10 days may be required)
Neo24+ test results are usually available within 5 days of the sample of maternal blood being received by Juno’s partner laboratory (although up to 14 days may be required)
They are tests that are performed before the baby is born and in which the sample to be studied is not obtained directly from the foetus, but from its DNA that is found freely circulating in the mother’s blood, which is why it is non-invasive.