Spontaneous Abortion

Abortion is defined as termination of pregnancy resulting in expulsion of an immature, nonviable fetus. A fetus of <20 weeks gestation or a fetus weighing <500 gm is considered an abortus. Spontaneous abortion occurs in 15% of all pregnancies.

I. Threatened abortion is defined as vaginal bleeding occurring in the first 20 weeks of pregnancy, without the passage of tissue or rupture of membranes.

A. Symptoms of pregnancy (nausea, vomiting, fatigue, breast tenderness, urinary frequency) are usually present.

B. Speculum exam reveals blood coming from the cervical os without amniotic fluid or tissue in the endocervical canal.

C. The internal cervical os is closed, and the uterus is soft and enlarged appropriate for gestational age.

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