Pregnancy Risk Factors For Miscarriage

Pregnancy Risk Factors For Miscarriage

Human reproduction is remarkably inefficient and only 30–50% of conceptions survive to a live birth. Relatively little is known about embryo loss before the implantation stage (which happens around 20–23 days since LMP), but it is estimated from prospective studies of women attempting to conceive that around 1 in 3 pregnancies reaching the implantation stage will end in miscarriage. Many of these early miscarriages go unnoticed because the woman may not know she is pregnant. After 6 weeks since LMP, the usual cut-off for defining a clinical pregnancy, recent epidemiological studies relying on self-report or linkage to clinical records find prevalences of 12–20%.

 
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