What is this test

Non Invasive Prenatal Testing - NIPT (Harmony Test by Ariosa)


​DNA from the fetus circulates in the mother’s blood. Cell-free DNA (cfDNA) results from the natural breakdown of fetal cells (presumed to be mostly placental) and clears from the maternal system within hours of giving birth. During a pregnancy, cfDNA can be tested to give the most accurate screening approach in estimating the risk of a fetus having a common chromosome condition sometimes called a trisomy. This occurs when there are three copies of a particular chromosome instead of the expected two.

The test looks to detect the following trisomies:

  • Trisomy 21 is the most common trisomy at the time of birth. Also called Down syndrome, it is associated with moderate to severe intellectual disabilities and may also lead to digestive disease, congenital heart defects and other malformations.
  • Trisomy 18 (Edwards syndrome) and Trisomy 13 (Patau syndrome) are associated with a high rate of miscarriage. These babies are born with severe brain abnormalities and often have congenital heart defects as well as other birth defects. Most affected individuals die before or soon after birth and very few survive beyond the first year of life.
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  • Published: 23-10-2017
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  • Due date & Gestational age based on period

    Due date & Gestational age based on period

    Due Date Calculator based on Last Menstrual Period (LMP).
    Enter the first day of your Last Menstrual Period and the length of your cycle in order to estimate your Due Date and the gestational age at present. Note, all dates given are estimates; We will give you a more accurate indication of your due date when you have your 7-10 week ultrasound scan.

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    Gestational Age based on the Due Date
    If you know you'\re due date, you can calculate how many weeks of pregnancy you have completed so far.

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