7 Reasons Your Doctor May Recommend an Ultrasound (USG) in Pregnancy

An ultrasound, also called a USG or sonography, is one of the most common tests in antenatal care. It uses high-frequency sound waves to create images of the baby, the placenta and the womb, without radiation. If your doctor has advised a scan, it does not always mean something is wrong. Here are the main reasons it may be recommended.

1. To confirm the pregnancy and its location

An early scan, usually between 6 and 9 weeks, confirms that the pregnancy is inside the uterus, checks for a fetal heartbeat and rules out an ectopic pregnancy, where the embryo implants outside the womb. It also shows whether you are carrying one baby or more.

2. To date the pregnancy accurately

Many women are unsure of their last menstrual period. Measuring the baby in the first trimester gives a more reliable gestational age and expected delivery date, which guides the timing of every later test.

3. To screen for chromosomal conditions

Between 11 and 14 weeks, the nuchal translucency (NT) scan measures fluid at the back of the baby’s neck. Combined with blood tests, it estimates the chance of conditions such as Down syndrome. This is a screening test, not a diagnosis, so a higher-risk result usually leads to further testing.

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4. To check the baby’s structural development

The anomaly scan, also called a level II scan, is done around 18 to 22 weeks. The sonographer examines the brain, heart, spine, kidneys, abdomen and limbs for structural differences. Finding an issue early gives families and doctors more time to plan care.

5. To monitor growth and amniotic fluid

Later scans measure the baby’s size and the amount of amniotic fluid. These are particularly useful if you have gestational diabetes, high blood pressure or twins, or if the womb measures smaller or larger than expected. Doppler studies may also assess blood flow in the umbilical cord.

6. To check the placenta and cervix

A scan shows where the placenta sits. If it covers the cervix (placenta previa), your doctor can plan a safer delivery. Cervical length measurement may also be advised when there is a history of preterm birth or a risk of early labour.

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7. To investigate symptoms or plan delivery

Bleeding, abdominal pain or reduced fetal movements are usually followed by a scan for reassurance and answers. Near term, ultrasound confirms the baby’s position, head down or breech, which helps decide the mode of delivery.

Is a pregnancy ultrasound safe?

USG in pregnancy has been done for decades and is considered safe when performed for medical reasons by trained professionals. In India, the PCPNDT Act also prohibits disclosing the baby’s sex during a scan, so sonologists cannot share it.

Final thoughts

Every pregnancy is different, so the number of scans varies from one woman to another. Follow the schedule your obstetrician recommends, and ask about anything in your report you do not understand. If you need more specialised guidance, a fetal medicine specialist in Bangalore can help explain scan results and what they may mean for your pregnancy. An experienced team, such as the one at Apollo Cradle & Children’s Hospital, can also explain each result and the next steps clearly