Risk Of Down Syndrome By Age Chart. The calculator below calculates the theoretical risk for Down syndrome and chromosome abnormalities in multiple gestations. Growth charts have been developed specifically for children with Down syndrome.
This combination is also known as NT alone because serum analytes are not utilized. Trisomy 21 Risk Calculator. However nowadays many women are giving birth at 35.
An 18-20 week ultrasound without soft markers or anomalies can reduce the estimated risk of Trisomy 21 Down syndrome by approximately 50 Smith-Bindman 2007.
These numbers are rounded and approximate. For more information please visit the Expecting Parent pages on our website or consult with your healthcare provider to see if NIFTY is right for you. The CDC provides a breakdown of the risk for Down syndrome by mothers age at. At least for twin gestations the theoretical risk may be an overestimate of the observed risk of Down syndrome in some populations 23.