Down Syndrome Risk Calculator - Risk by Maternal Age

Estimate your risk of Down syndrome (trisomy 21) and other trisomies based on maternal age, with optional adjustments for risk timepoint and previous pregnancies.

Mother's age at delivery

Previous child with Down syndrome

or see example results

This calculator provides statistical estimates based on maternal age only and is not a medical diagnosis. Risk figures represent population averages and do not predict the outcome of any individual pregnancy. Screening results should always be discussed with your healthcare provider or a genetic counselor. Sources: Morris, Mutton & Alberman, J Med Screen 9:1, 2002. Hook EB, JAMA 249:2034, 1983. Savva et al, Prenat Diagn 26:5, 2006. ACOG Practice Bulletin.