What is the prevalence of early pregnancy loss in the US?

Updated: Nov 05, 2018
  • Author: Slava V Gaufberg, MD; Chief Editor: Jeter (Jay) Pritchard Taylor, III, MD  more...
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Many pregnancies are not viable. According to estimates, 50% of pregnancies terminate spontaneously before the first missed menstrual period; these miscarriages usually are not clinically recognized. Spontaneous miscarriage is typically defined as a clinically recognized (ie, by blood test, urine test, or ultrasonography) pregnancy loss before 20 weeks' gestation. Approximately 5-15% of diagnosed pregnancies result in spontaneous miscarriage.

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