* This calculator takes into account the most common and viable age-related chromosome conditions, including Trisomy 21 (Down syndrome), Trisomy 13 and Trisomy 18. These probability estimates do not include all chromosome conditions.

** The probabilities used in this calculator are based on maternal (mom’s) age at delivery, assuming natural conception and no use of a donor egg.

References:   Hook EB, Cross PK, Schreinemachers DM. Chromosomal abnormality rates at amniocentesis and in live-born infants. JAMA. 1983 Apr 15;249(15):2034-8.

The content of this website is for informational purposes only and is intended to educate consumers about health care issues and choices. This information is not a substitute for professional medical advice, diagnosis, or treatment. You should always consult with your physician before making medical decisions or electing to undergo any medical testing or treatment, or if you have any questions or concerns about your health.