How common is miscarriage?

Many patients are equally surprised to learn how common pregnancy loss (miscarriage) occurs. Think of miscarriage as the flipside of the pregnancy coin. As pregnancy rates drop with age, so do miscarriages increase with age. During the peak fertility years of the late 20s/early 30s, miscarriage unfortunately occurs in about 15-20% of all pregnancies. This rate continuously rises over time and, by 40 years of age, the chance of a naturally achieved pregnancy ending in loss is 40%. The number one cause for pregnancy loss by far is chromosomal abnormalities and the current mitigation strategy for this is preimplantation genetic testing for aneuploidy (PGT-A).