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Provincial Health Services Authority (PHSA) improves the health of British Columbians by seeking province-wide solutions to specialized health care needs in collaboration with BC health authorities and other partners.

one done in the first trimester and one in the second trimester.

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Most women who have a prenatal screen get a result showing that chances are low for these conditions.Approximately one in 20 women (5%) who have a prenatal screen will have a result that suggests their chance of having a baby with one of these conditions is high enough that they should consider either diagnostic testing to find out for sure or another screening test with higher accuracy (non-invasive prenatal testing [NIPT]).Most women who get such a result will not have a baby with Down syndrome, trisomy 18, or an open neural tube defect.For more information, you can also download the pamphlet Prenatal Genetic Screening: It's Your Choice.The prenatal genetic screen tells you the chance of your baby having one of three conditions: Down syndrome, trisomy 18, or an open neural tube defect.Down syndrome is a genetic condition in which a baby has 47 chromosomes (three copies of chromosome 21 instead of two) instead of 46.Down syndrome is the most common chromosome problem.Approximately one in 700 babies is born with Down syndrome.People with Down syndrome have mild to moderate intellectual delays and a higher chance of some health problems.Each person with Down syndrome is different and there is no way to predict how serious any problems will be.People with Down syndrome usually live into their 50s.

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