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How Ultrasound Scan Detects Complications of Low-Lying Placenta

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As a doctor at Koshikaa, I regularly meet expecting mothers who come in for reassurance regarding placenta position and pregnancy health. One of the most important evaluations we perform is assessing the complications of a low-lying placenta through imaging. Early detection plays a key role in preventing risks during pregnancy. 

Many mothers visit us for an ultrasound scan in Bangalore, especially when routine check-ups show the placenta positioned lower than expected. A reliable health screening centre in Bangalore ensures that placenta-related concerns are monitored with high precision, helping expectant mothers understand their risks and care requirements.

Understanding Low-Lying Placenta

A low-lying placenta occurs when the placenta implants in the lower part of the uterus instead of the upper region. In early pregnancy, this is common and often resolves naturally as the uterus expands upward.

Causes of Low-Lying Placenta at 12 Weeks

At 12 weeks, the condition is usually due to:

  • Natural early pregnancy implantation
  • Uterine shape variations
  • Previous C-sections or uterine surgeries
  • Multiple pregnancies (twins or more)
  • Maternal age or lifestyle factors

Most cases improve by the third trimester, but continuous monitoring is essential.

Is a Low-Lying Placenta Dangerous?

For many women, it is not dangerous early on. However, concerns arise when the placenta remains low in late pregnancy.

Risks may include:

  • Bleeding after 20 weeks
  • Restricted fetal movement
  • Preterm labor
  • Delivery complications
  • Need for C-section

Knowing whether a low-lying placenta is dangerous depends entirely on ultrasound findings and clinical evaluations.

Types of Complications Seen in Placenta Issues

1. General Complications of Placenta

Placental complications may include:

  • Placental abruption
  • Placental insufficiency
  • Placenta accreta spectrum
  • Preterm delivery risks

Ultrasound helps identify these issues early.

2. Complications of Placenta Previa

Placenta previa occurs when the placenta covers the cervix partially or completely.
Complications can include:

  • Heavy bleeding during pregnancy
  • Delivery obstruction
  • Emergency C-section
  • Maternal and fetal distress

Ultrasound is the primary diagnostic tool for placenta previa.

How Ultrasound Detects Complications of Low-Lying Placenta

Ultrasound remains the most effective and safe method to detect placenta position and related complications. It provides real-time imaging, allowing us to visualize placental attachment, thickness and relationship to the cervix.

Here’s how it helps:

1. Identifying Placenta Location

A simple transabdominal scan shows exactly where the placenta is attached. This determines whether it is low-lying, partially covering or fully covering the cervix.

2. Monitoring Placenta Movement

The placenta does not move physically but appears to shift upward as the uterus grows. Ultrasound tracks this progression through pregnancy.

3. Detecting Placenta Previa

Using imaging markers, we identify if the placenta encroaches on the cervical opening, helping diagnose placenta previa accurately.

4. Identifying Bleeding Risks

Color Doppler ultrasound helps detect abnormal blood vessels and bleeding areas, essential for managing complications.

5. Assessing Placenta Accreta Spectrum

A detailed ultrasound can show signs of abnormal placental invasion into the uterine wall, allowing early planning for safe delivery.

How Often Should Ultrasound Be Repeated?

Ultrasound frequency depends on severity.

  • Early detection at 12–20 weeks is common.
  • Repeat scans may be done at 28–32 weeks.
  • Additional scans may be recommended if there is bleeding or symptoms.

Monitoring helps us determine whether the placenta has moved upward as the uterus expands.

When Does a Low-Lying Placenta Typically Move Up?

Most cases resolve by:

  • 20–24 weeks in many women
  • Third trimester, in some cases

Only a small percentage remain low close to delivery.

Final Thoughts

Understanding the complications of a low-lying placenta helps expectant mothers stay informed and prepared throughout pregnancy. 

Ultrasound remains the safest, most accurate tool for detecting placenta position, placenta previa, bleeding risks and other complications. Regular monitoring at a reliable health screening centre in Bangalore ensures that placenta-related risks are managed with care and precision. 

Whether it’s understanding early causes, identifying dangers or planning follow-up scans, ultrasound plays a central role in safe pregnancy management. For mothers seeking clarity and reassurance, an expert ultrasound scan in Bangalore at Koshikaa provides the detailed insights needed for safe and confident prenatal care.

FAQs

1. Can ultrasound detect a low-lying placenta?

Yes. Ultrasound is the primary and most accurate method to detect placenta position and classify whether it is low-lying or normal.

2. How to see placenta previa on ultrasound?

Placenta previa is visible when the placenta covers part or all of the cervical opening. Ultrasound clearly shows the placenta’s relationship to the cervix.

3. When to repeat ultrasound for a low-lying placenta?

A repeat scan is usually done around 28–32 weeks to check if the placenta has moved upward. Further scans may be recommended based on symptoms.

4. In which week does a low-lying placenta go up?

Most low-lying placentas shift upward by 20–24 weeks and often resolve completely by the third trimester.

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