Two tests -- amniocentesis and chorionic villus sampling -- can be done to look for Down syndrome during the first half of pregnancy, but they are not without risk of causing a miscarriage.
Therefore, they should only be done if there is a high liklihood of genetic problems in the baby.
A blood test called the "triple screen" can be done between the 15th and the 22nd weeks of pregnancy, but it's more accurate when done between the 16th and 18th weeks.
The triple screen cannot tell for sure if your baby has Down syndrome, but it can tell if the risk is higher.
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