4D Scan vs Anomaly Scan: What is the Difference?

Many parents in Malaysia book a 4D scan during pregnancy to see their baby's face and capture keepsake images. While 4D scans can be a wonderful experience, it is important to understand that they are not a substitute for a medical anomaly scan. The two serve completely different purposes.

A detailed anomaly scan is a medical examination performed between 18 and 22 weeks. Its purpose is to check the baby's organs and structural development — the brain, heart, spine, kidneys, limbs, and every other major system. It is performed according to a systematic protocol, typically following ISUOG guidelines, and the findings are interpreted by a trained specialist. The anomaly scan can detect conditions that affect the baby's health and change the pregnancy management plan.

A 4D scan uses the same ultrasound technology but focuses on creating a three-dimensional video image of the baby's face and movements. It is designed for bonding and keepsake purposes, not for medical diagnosis. Most 4D scan providers — especially standalone commercial centres — do not perform the comprehensive organ-by-organ assessment that an anomaly scan requires.

The critical distinction is this: a clear 4D image of your baby's face does not tell you whether their heart, brain, or kidneys are developing normally. A baby can look perfect on a 4D scan and still have a structural abnormality that only a medical anomaly scan would detect. This is why every pregnancy needs a proper anomaly scan performed by a qualified specialist, regardless of whether you also have a 4D scan.

Some parents choose to have both — a medical anomaly scan with a specialist, and a separate 4D keepsake session. This is perfectly fine. The concern arises when parents skip the anomaly scan entirely because they believe the 4D scan covers the same ground. It does not.

Dr. Kartik Balaraman performs detailed anomaly scans personally at Columbia Asia Hospital Bukit Jalil, bringing his MFM training and fetal imaging expertise to every examination. If you have already had a 4D scan elsewhere, Dr. Kartik can still perform a full anomaly assessment — the two are independent, and a medical scan is always recommended.