What Is a Blighted Ovum? Causes, Signs and Treatments Explained

Receiving news of an early pregnancy loss can be emotionally devastating. For many couples, the excitement of a positive pregnancy test is suddenly cut short by a diagnosis they may have never heard of before: a blighted ovum.

A blighted ovum is one of the most common reasons for early miscarriage, yet it remains widely misunderstood. Understanding blighted ovum causes, symptoms, and how doctors diagnose this condition can help you process the experience and find clarity as you look toward the future.

What Is a Blighted Ovum (Anembryonic Pregnancy)?

A blighted ovum, medically referred to as an anembryonic pregnancy, occurs when a fertilized egg attaches itself to the uterine wall, and a gestational sac begins to grow, but an embryo fails to develop.

During a normal pregnancy, a fertilized egg divides and develops into two parts: one part becomes the embryo (the baby), and the other becomes the placenta and gestational sac. In a blighted ovum, the cells that form the sac and placenta continue to grow and release pregnancy hormones, but the cells meant to form the embryo stop developing very early in the process.

Because the placenta continues to secrete human chorionic gonadotropin (hCG)—the hormone detected by pregnancy tests—you will likely test positive and experience early pregnancy symptoms, even though there is no developing embryo inside the sac.

What Causes a Blighted Ovum?

One of the most important things for couples to know is that a blighted ovum is not caused by anything you did or did not do. It is a natural biological event.

1. Chromosomal Abnormalities

The primary driver among all blighted ovum causes is chromosomal irregularities. When fertilization occurs, the egg and sperm combine their genetic material. If there is an error during this fusion—such as too many or too few chromosomes, or damaged DNA—the fertilized egg does not have the genetic instructions it needs to develop into an embryo. The body recognizes this genetic mismatch and naturally stops the embryo's development while the gestational sac may continue to grow for a short time.

2. Low-Quality Egg or Sperm cells

Poor egg or sperm quality can lead to chromosomal errors during fertilization. As women age, the risk of chromosomal abnormalities in eggs increases. Similarly, high DNA fragmentation in sperm cells can affect the early stages of cell division. Understanding and optimizing reproductive health before conception can help address these factors. Learn more about evaluating sperm quality in our guide on male infertility treatment in Delhi.

3. Faulty Cell Division

Even if the egg and sperm are healthy, errors can occur during the rapid cell division that happens immediately after fertilization. If a critical division step fails, the embryo cannot form, leading to an anembryonic pregnancy.

Signs and Symptoms of a Blighted Ovum

Because a blighted ovum mimics a normal early pregnancy, it can be difficult to identify without medical imaging.

Early Pregnancy Signs

In the beginning, you will likely feel pregnant. The placenta continues to produce hCG, which triggers typical early symptoms:

• Positive home pregnancy tests
• Breast tenderness or swelling
• Morning sickness or mild nausea
• Fatigue and mood changes

Signs of an Impending Miscarriage

As hCG levels begin to plateau or fall, your body will eventually recognize that the pregnancy is not progressing. This can lead to symptoms of miscarriage, including:

• Vaginal spotting or light bleeding
• Mild to moderate abdominal cramping
• A sudden decrease in early pregnancy symptoms (like nausea or breast tenderness)

In some cases, a woman may have no bleeding or cramping at all. The condition is then discovered during a routine prenatal visit—a situation often called a "silent" or "missed" miscarriage.

Finding Support in Difficult Times
Experiencing a pregnancy loss is a deeply personal and emotional journey. It is completely normal to feel grief, confusion, or anxiety. If you are struggling to process a loss or want to understand your reproductive health better, you can connect with the team at Pravi Global IVF for compassionate care and guidance.

How Is a Blighted Ovum Diagnosed?

A blighted ovum cannot be diagnosed through a pregnancy test or physical exam alone. It requires diagnostic imaging and hormone tracking.

1. Transvaginal Ultrasound (TVS)

An ultrasound is the definitive tool for diagnosing a blighted ovum. During a transvaginal ultrasound, the doctor looks inside the uterus:

• A normal pregnancy: Around the 6th or 7th week, the ultrasound will show a clear gestational sac containing a visible embryo and a heartbeat.
• A blighted ovum: The ultrasound shows a gestational sac that has grown to a certain size (usually 25mm or larger), but the sac remains completely empty, with no embryo or yolk sac visible.

If the pregnancy dating is uncertain, the doctor may recommend waiting 7 to 10 days and performing a follow-up ultrasound to confirm that the sac is indeed empty and not just younger than expected.

2. Quantitative hCG Blood Tests

Your doctor may perform serial blood tests to measure the exact amount of hCG in your bloodstream. In a healthy pregnancy, hCG levels double every 48 to 72 hours. In a pregnancy with a blighted ovum, hCG levels may rise slowly, plateau, or begin to decrease.

Treatment and Management Options

Once a blighted ovum is confirmed, your doctor will discuss management options. The choice depends on your physical health, emotional readiness, and medical history.

• Expectant Management (Waiting Naturally): You can choose to wait for your body to pass the pregnancy tissue naturally. This process usually begins within a few weeks of the embryo stopping development. While this avoids medical or surgical intervention, the timing is unpredictable, and it can be emotionally difficult to wait.
• Medical Management: Your doctor can prescribe medications (such as misoprostol) to help the uterus contract and pass the tissue in a controlled manner. This typically takes effect within a few hours to a couple of days, allowing you to manage the process at home with pain relievers.
• Surgical Management (D&C): A minor surgical procedure called Dilation and Curettage (D&C) can be performed to clear the uterine lining. The cervix is gently dilated, and a specialist uses gentle suction to remove the pregnancy tissue under light anesthesia. A D&C is often preferred by couples who want immediate closure.

Getting Pregnant After a Blighted Ovum

A single occurrence of a blighted ovum does not mean you cannot have a healthy pregnancy in the future. Most women who experience a blighted ovum go on to have successful pregnancies next time.

• Physical Recovery: Your menstrual cycle will usually return within 4 to 6 weeks after the pregnancy tissue is cleared.
• Timing: Medically, you can try to conceive again after one complete menstrual cycle, which allows the uterine lining to rebuild. However, you should only proceed when you and your partner feel emotionally ready.
• Testing: If you experience repeated early pregnancy losses, a fertility specialist may recommend advanced testing, such as karyotyping (genetic testing of both partners) or checking for hormonal issues. To learn more about diagnostics, read about PCOS treatment in Delhi.

Frequently Asked Questions

1. Does a blighted ovum count as a miscarriage?

Yes. Although no embryo develops, a blighted ovum is classified as an early miscarriage (anembryonic pregnancy) because the fertilized egg implanted but could not progress.

2. Can a blighted ovum hide an embryo that appears later?

In very early pregnancy (before 6 weeks), the embryo may be too small to see. If your doctor suspects this, they will schedule a follow-on scan in a week. If the gestational sac is larger than 25mm and remains empty on the second scan, a blighted ovum is confirmed.

3. Will a blighted ovum resolve on its own?

Yes, in most cases, the body will naturally recognize the loss and pass the tissue. However, medical or surgical treatments are available to manage the process safely and prevent infection.

4. Is a D&C mandatory for a blighted ovum?

No. A D&C is not mandatory unless you experience heavy bleeding, severe pain, or signs of uterine infection. You can discuss natural miscarriage or medication options with your healthcare provider.

5. Can IVF prevent a blighted ovum?

While IVF cannot guarantee success, it allows for Preimplantation Genetic Testing (PGT). PGT screens embryos for chromosomal abnormalities before they are transferred, which can significantly reduce the risk of a miscarriage caused by a blighted ovum.

Conclusion

A blighted ovum is a difficult experience, but it is important to remember that it is almost always a one-off event caused by random chromosomal errors. It is not a sign of your inability to carry a pregnancy to term. Giving yourself time to heal physically and emotionally is a key part of your recovery.

If you have experienced pregnancy loss and want to discuss your reproductive health or plans for a future pregnancy, we are here to support you. Contact Pravi Global IVF today to speak with a caring fertility specialist.