Maternal Age and Risk of Having a Baby With a Chromosomal Abnormality*
Age of Woman | Risk of Any Chromosomal Abnormality | |
|---|---|---|
20 | 0.2% | |
30 | 0.3% | |
35 | 0.6% | |
40 | 1.6% | |
45 | 5.4% | |
49 | 15% | |
* This table includes only chromosomal abnormalities that can be detected by standard chromosomal testing. Risks of having a baby with submicroscopic chromosomal abnormalities (which can be detected only by special testing) are not included. Hook EB. Rates of chromosome abnormalities at different maternal ages. Obstet Gynecol. 1981 Sep;58(3):282–285. | ||