Ultrasound of Obstetric - Ultrasound 28 Weeks

Why 28 Weeks?

At 28 weeks, your baby is about 2.5 pounds and 15 inches long. Fat is forming under the skin, which makes facial features more distinct. This is an ideal time for a 3D ultrasound because the baby is large enough for details but still has room to move.

What 3D Ultrasound Shows

Unlike traditional 2D, 3D ultrasound captures multiple images from different angles to create a realistic, three-dimensional view. You can see your baby's face, lips, nose, and even expressions like yawning or smiling.

How It Works

The procedure uses sound waves that bounce off tissues to form images. A special transducer sweeps over your belly, and a computer processes the echoes into a 3D image. It's similar to 2D but with faster processing and more advanced software.

Preparation and Safety

No special prep is needed—just have a full bladder if told. Decades of use show no known risks to you or baby. It uses low-intensity sound waves, and the FDA advises using it only for medical reasons, not for keepsakes.

Limitations and Considerations

Image quality depends on baby's position, amniotic fluid, and your tissue thickness. If the baby faces away or is crowded, details may be blurry. The scan may take longer than 2D, and it's not a substitute for diagnostic 2D exams.

What Happens During the Scan

You'll lie on a table with your belly exposed. A gel is applied, and the tech moves a handheld probe over your skin. You'll see the 3D images on a screen. The exam lasts 30-45 minutes, and you can ask questions during it.

After the Scan

Images may be saved as photos or video. Your doctor will review the findings and discuss any next steps. Most times, results are reassuring, and you get a special keepsake to share with family.