Situation: The nurse works in the prenatal clinic and antepartum ward of a provincial hospital. A 23-year-old at 9 weeks' gestation had an intrauterine gestational sac on ultrasound 1 week ago. Six hours ago, after heavy bleeding and strong cramps at home, she passed a large clot with tissue. Now she has only light spotting, the cramps have eased, and the cervical os is closed. Transvaginal ultrasound shows an empty uterus with a thin endometrial lining. How should the nurse classify this pregnancy loss?

A complete abortion is one in which all pregnancy tissue has passed: bleeding and pain decrease, the cervix closes, and the uterus is empty on ultrasound. The earlier scan confirmed that the pregnancy was intrauterine, so an empty uterus now means the tissue has passed rather than an ectopic pregnancy. No procedure is needed; the loss is confirmed with ultrasound or falling human chorionic gonadotropin (hCG).

Classification of early pregnancy loss

The correct classification is complete abortion. The clinical picture here is classic: heavy bleeding and strong cramping occurred first, followed by passage of a large clot with tissue, and now the patient has only light spotting, diminished pain, and a closed cervical os. The transvaginal ultrasound finding of an empty uterus with a thin endometrial lining confirms that all products of conception have already been expelled.

The earlier ultrasound at 8 weeks documented an intrauterine gestational sac, which rules out ectopic pregnancy as the cause of the empty uterus. If the pregnancy had not been previously confirmed as intrauterine, an empty uterus with bleeding could raise concern for a ruptured or resolving ectopic pregnancy. In this case, the sequence of events—intrauterine pregnancy documented, then heavy bleeding with tissue passage, then an empty uterus—fits the definition of complete abortion.

The key features that distinguish complete abortion from incomplete abortion are the closed cervix, the marked reduction in bleeding and pain, and the ultrasound finding of an empty uterus. In incomplete abortion, some products of conception remain inside the uterus, the cervix is typically open, bleeding is heavier and ongoing, and ultrasound shows retained tissue or a thickened, irregular endometrial echo.

Feature	Complete abortion	Incomplete abortion	Threatened abortion	Missed abortion
Cervical os	Closed	Open	Closed	Closed
Bleeding	Light spotting after passage of tissue	Heavy, ongoing	Light spotting, no tissue passed	Usually none or minimal
Pain/cramping	Eased after tissue passed	Persistent cramping	Mild or absent	Absent or mild
Ultrasound	Empty uterus, thin endometrium	Retained tissue, heterogeneous contents	Viable intrauterine pregnancy	Nonviable fetus, gestational sac remains
hCG trend	Falling	Falling but may plateau	Rising appropriately	Plateauing or falling

Key point! A complete abortion does not require surgical evacuation. Management is expectant: monitor for resolution of bleeding, confirm falling human chorionic gonadotropin (hCG) levels, and provide emotional support and contraception counseling. The diagnosis is confirmed by the combination of clinical findings and ultrasound showing an empty uterus.

The case report by Spielvogel (2023) illustrates a rare but important follow-up consideration after complete abortion. In that case, a patient with a confirmed complete abortion after medication abortion at 9 weeks gestation had cessation of bleeding and an ultrasound confirming completion at one week. However, she later presented with a placental polyp, a hypervascular retained fragment of placental tissue that can develop even after an apparently complete abortion. Placental polyps are estimated to complicate fewer than 0.25% of pregnancies and typically present within four weeks of delivery or abortion, although delayed presentations can occur. This does not change the initial classification of complete abortion, but it underscores the need for follow-up if a patient develops recurrent bleeding, pain, or abnormal discharge weeks after a seemingly complete loss.

Watch out! Do not classify this as a missed abortion. In missed abortion, the fetus or embryo has died but the products of conception remain in the uterus for weeks; the cervix is closed, and there is typically no passage of tissue. Here, the patient passed tissue and the uterus is empty, which is the opposite clinical picture.