What causes a blighted ovum? What symptoms can I expect?
Answers from Yvonne Butler Tobah, M.D.
A blighted ovum, also called an anembryonic pregnancy or anembryonic gestation, occurs when the early embryo stops developing, is resorbed and leaves an empty gestational sac. The reason this occurs is often unknown, but it may be due to chromosomal abnormalities in the fertilized egg.
A blighted ovum usually occurs early in pregnancy — between about week 8 and week 13 — sometimes before you even know you're pregnant. However, you may be aware of your early pregnancy because of a positive pregnancy test or missed menstrual period. A pregnancy test may be positive because the early embryo secretes a pregnancy hormone — human chorionic gonadotropin (HCG) — until the embryo stops developing and fails to implant.
You may have symptoms of early pregnancy, such as breast tenderness, nausea and vomiting. But when the embryo stops growing and hormone levels decrease, pregnancy symptoms subside. At this point, minor abdominal cramping and light spotting or bleeding are possible. An ultrasound will show an empty gestational sac.
A blighted ovum eventually results in miscarriage. Some women choose to wait for the miscarriage to happen naturally, while others take medication to trigger the miscarriage. In some cases, a procedure called dilation and curettage (D&C) is used to remove the placental tissues.
Most women who've had a blighted ovum go on to have successful pregnancies. If you experience multiple consecutive miscarriages, talk with your doctor or other care provider to identify any underlying causes.
Aug. 19, 2016
Yvonne Butler Tobah, M.D.
See more Expert Answers
- Gabbe SG, et al. Obstetric ultrasound: Imaging, dating, growth, and anomaly. In: Obstetrics: Normal and Problem Pregnancies. 7th ed. Philadelphia, Pa.: Elsevier; 2017. http://www.clinicalkey.com. Accessed Aug. 9, 2016.
- DeCherney AH, et al. Early pregnancy risks. In: Current Diagnosis & Treatment Obstetrics & Gynecology. 11th ed. New York, N.Y.: The McGraw-Hill Companies; 2013. http://www.accessmedicine.com. Accessed Aug. 9, 2016.
- Tulandi T, et al. Spontaneous abortion: Risk factors, etiology, clinical manifestations, and diagnostic evaluation. http://www.uptodate.com/home. Accessed Aug. 9, 2016.
- Bastian LA, et al. Clinical manifestations and diagnosis of early pregnancy. http://www.uptodate.com/home. Accessed Aug. 9, 2016.
- Treatment of recurrent pregnancy loss. American Society for Reproductive Medicine. http://www.asrm.org/FACTSHEET_Treatment_of_recurrent_pregnancy_loss/. Accessed Aug. 9, 2016.
- Frequently asked questions. Pregnancy FAQ090. Early pregnancy loss. American College of Obstetricians and Gynecologists. http://www.acog.org/~/media/For%20Patients/faq090.pdf. Accessed Aug. 9, 2016.
- Butler Tobah Y (expert opinion). Mayo Clinic, Rochester, Minn. Aug. 10, 2016.