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Pregnancy Ultrasound in Korea: What to Expect Guide

Seeing the first flicker of a heartbeat on a screen, or the unmistakable profile of a tiny nose and chin at the anatomy scan, are among the moments expectant parents remember most vividly from pregnancy. Ultrasound serves a genuine medical purpose at each stage — confirming viability, dating the pregnancy, checking chromosomal risk markers, and eventually mapping out fetal anatomy in detail — and knowing what each scan is actually for makes the whole experience considerably less mysterious.

This guide covers the typical ultrasound schedule during pregnancy, what each scan involves, and what to expect from this care at hospitals and clinics in Busan.

How Many Ultrasounds Will You Have?

For a pregnancy progressing without complications, most people have two standard ultrasounds — one in the first trimester and one in the second trimester. The exact number and timing can vary based on when you first see a provider, whether any symptoms or concerns arise, and whether your pregnancy is considered higher risk, in which case additional monitoring scans are common.

First Trimester Ultrasound

Timing and Purpose

Typically performed between roughly 6 and 12 weeks, this scan confirms the pregnancy, establishes gestational age, and sets an estimated delivery date. Early in this window, particularly between 7 and 9 weeks, a transvaginal ultrasound may be used for a clearer image, while later in the first trimester a standard abdominal ultrasound often provides sufficient detail.

What It Checks

This scan confirms the pregnancy is developing within the uterus, checks for a detectable heartbeat, and, if there's any bleeding or pain, helps rule out an ectopic pregnancy or other early complications.

Nuchal Translucency (NT) Scan

Performed between 11 and 13 weeks, this optional scan measures the fluid at the back of the baby's neck to help assess the likelihood of certain chromosomal conditions, including Down syndrome. It's typically offered as part of a broader first-trimester screening approach rather than a routine, universally required test, and whether to have it is a personal decision to discuss with your provider.

Second Trimester Ultrasound: The Anatomy Scan

Timing

Usually performed between 18 and 22 weeks, sometimes called the anatomy scan, mid-pregnancy scan, or Level 2 ultrasound. This window is considered ideal because the baby is developed enough for organs and structures to be clearly visible, while still early enough to allow time to plan or adjust care if any concerns are identified.

What It Checks

This is the most detailed scan of the pregnancy, carefully examining the brain, spine, heart, limbs, and other organs to confirm normal development, along with checking the amniotic fluid level and the placenta's position and health.

Finding Out the Baby's Sex

For parents who wish to know, this scan often provides the opportunity to determine the baby's sex, though this isn't always possible with full certainty depending on the baby's position, with accuracy generally quite high but not guaranteed.

Third Trimester Ultrasound

Not every pregnancy includes a routine third-trimester ultrasound. Some clinics perform one routinely for all pregnancies, while many reserve additional third-trimester scans for situations involving a specific concern, such as bleeding, a suspected growth issue, or a pregnancy complicated by conditions like high blood pressure or gestational diabetes. When performed, this scan generally focuses on growth, amniotic fluid levels, and the baby's position ahead of delivery.

Why Timing Matters for Each Scan

Scheduling ultrasounds at the right point in pregnancy genuinely affects how much useful information they can provide. Too early, and organs simply haven't developed enough to examine clearly. Too late, and there's less time to plan or respond if something is identified. This is why the anatomy scan window of 18-22 weeks in particular is considered a carefully balanced sweet spot, rather than an arbitrary scheduling choice.

What to Expect During an Ultrasound Visit

Early ultrasounds may be performed transvaginally for a clearer image, while ultrasounds later in pregnancy are typically done abdominally, often requiring a full bladder for the earliest scans to improve visibility. A trained sonographer or your obstetrician will apply gel to the abdomen (or use a transvaginal probe, if applicable) and move a transducer to capture the necessary images and measurements. Most routine scans take between 20 minutes and an hour, depending on how detailed the examination is and whether the baby is in a position that makes certain views easy or more challenging to capture.

When Additional Ultrasounds Might Be Recommended

• Vaginal bleeding or pain during pregnancy
• Uncertainty about gestational age or a discrepancy between dates
• A suspected issue with fetal growth, amniotic fluid, or placental position
• Maternal health conditions such as high blood pressure or diabetes
• A multiple pregnancy (twins or more), which generally involves more frequent monitoring
• A prior pregnancy complication or loss

Why Choose Busan for Pregnancy Ultrasound Care

Hospitals and clinics in Busan offer the full range of pregnancy ultrasound services, from early dating scans through detailed anatomy scans and any additional monitoring needed for higher-risk pregnancies. International patients and expats can access this care with English-speaking coordinators available at many international-facing hospitals, helping ensure scans are scheduled at the appropriate points in pregnancy and results are clearly explained.

Tips for International Patients

• Bring any prior pregnancy records or ultrasound results if you conceived or had early scans outside Korea
• Ask your provider to walk you through what each scan is specifically checking for, since the purpose differs meaningfully between the first and second trimester scans
• Discuss whether the nuchal translucency scan is something you want as part of your first-trimester screening, since it's optional and a personal decision
• Schedule your anatomy scan within the recommended 18-22 week window rather than significantly earlier or later, to ensure the most useful information is captured
• Ask in advance whether a full bladder or other preparation is needed for a specific scan

Frequently Asked Questions

How many ultrasounds will I have during a normal pregnancy?

Most people with an uncomplicated pregnancy have two standard ultrasounds — one in the first trimester and one in the second trimester — though this can vary based on individual circumstances and any concerns that arise.

What's the difference between the dating scan and the anatomy scan?

The first-trimester dating scan confirms the pregnancy and establishes gestational age and due date, while the second-trimester anatomy scan, performed between 18 and 22 weeks, provides a detailed examination of the baby's organs and development.

Is the nuchal translucency scan required?

No, it's generally offered as an optional part of first-trimester screening for chromosomal risk assessment, and whether to have it is a personal decision to discuss with your provider.

Will I need a third-trimester ultrasound?

Not necessarily. Many clinics only perform a third-trimester ultrasound if there's a specific concern, such as bleeding, a suspected growth issue, or a maternal health condition like high blood pressure or diabetes, though some routinely include one for all pregnancies.

How accurate is determining the baby's sex during the anatomy scan?

Accuracy is generally quite high, though not guaranteed, since the baby's position during the scan can sometimes make this determination less certain.

Why is 18 to 22 weeks considered the ideal time for the anatomy scan?

By this point, the baby's organs and structures are developed enough to be examined clearly, while there's still enough time remaining in the pregnancy to plan or respond appropriately if any concerns are identified.

Conclusion

Pregnancy ultrasounds serve distinct purposes at each stage — confirming viability and dating in the first trimester, detailed anatomical assessment around 18 to 22 weeks, and additional monitoring later on if specific concerns arise. Understanding what each scan is actually checking for can make these appointments feel less uncertain and more like the informative checkpoints they're designed to be. Hospitals and clinics in Busan offer comprehensive ultrasound care throughout pregnancy, with clear guidance for international patients navigating this schedule for the first time.