How Many Conceptions Spontaneously Abort?

Miscarriage. Miscarriage or spontaneous abortion involves the loss of a pregnancy, usually within the first 3 months of conception. The estimated frequency of spontaneous abortion is between 12% and 24% of all clinically identified pregnancies.

What percentage of pregnancies end in spontaneous abortions?

Miscarriage is the spontaneous loss of a pregnancy before the 20th week. About 10 to 20 percent of known pregnancies end in miscarriage. But the actual number is likely higher because many miscarriages occur so early in pregnancy that a woman doesn't realize she's pregnant.

What percentage of conceptions result in a live birth?

This means that 62 percent of pregnancies ended in a live birth, 22 percent ended in abortion, and 16 percent ended in a miscarriage or stillbirth.