Decoding Your Congenital Anomaly Scan Results: A Simple, Stress-Free Guide

I distinctly remember the mix of nerves and excitement leading up to our 25-week milestone. While the first scan at six weeks was all about confirming a heartbeat, finally receiving our Congenital Anomaly Scan results felt different. It wasn’t just a simple hi to the baby; it felt like our first real, deep look into our baby’s development.

This is the moment where every detail is examined—from structural formation to the progress of tiny organs. For me, this was the ultimate check-in. It answered the quiet questions I’d been carrying: Am I doing enough? Is my nutrition helping the baby? Is my stress affecting them? Beyond the excitement of gender, our priority was simply hearing that the baby was healthy and doing fine.

*Please note that this blog post is for informational purposes only and is not a substitute for professional medical advice; always consult your OB-GYN for the official interpretation of your Congenital Anomaly Scan results.

A Detailed Look at the Anatomy

Stepping into the room for the CAS was a much different experience than our first transvaginal ultrasound. This time, it was a detailed abdominal scan, and seeing the baby on the large screen was breathtaking. I was so grateful to have my husband by my side; I learned from my mistake during the first scan and confirmed ahead of time that he was allowed in the room.

The sonologist was incredibly thorough. Depending on how cooperative the baby is, the medical check can be quick (ours took less than 20 minutes) but the peace of mind lasts much longer. Having last seen the baby during a pelvic ultrasound at 16 weeks, the growth was astounding. It felt so grounding to realize that my body is the one making all of this happen.

The Numbers and the Trends

As someone who loves tracking data, I was focused on the heart rate. During this scan, we recorded a steady 145 bpm. It’s fascinating to see how these numbers evolve; while our earlier Dopplers fluctuated, seeing a consistent trend in the 140s now provides such a grounded sense of the baby’s activity and health.

What is a CAS? Understanding Your Congenital Anomaly Scan Results

The Congenital Anomaly Scan is a comprehensive structural survey usually performed in the second trimester (my OBGYN prescribed mine for week 24). You’ll need a doctor’s prescription for this, so patience is key! Here is how the doctor walked us through the baby’s development:

The Inner Workings: The sonologist took us on a tour of the tiny organs, checking that the heart chambers were pumping, the kidneys and bladder were in place, and the stomach was forming exactly where it should be.
The Hearbeat Center: We got to see the brain structure, specifically the cerebellum and ventricles, which are the building blocks of the baby’s neurological development.
The Growth Chart: By measuring the head and the tiny thigh bone (femur), the scan confirmed the baby is growing at a healthy, consistent rate for their age.
The Support System: We checked the placenta’s position (making sure it wasn’t too low) and the umbilical cord to ensure the baby is getting a steady flow of nutrients.
The Silhouette: The best part? It’s the clear profile shot. Seeing that silhouette makes the whole journey feel incredibly real.

Decoding the Report: The Terminology

Staring at the paperwork can feel like reading a complex spreadsheet. Here are a few terms you’ll likely see in your Congenital Anomaly Scan results:

“Biometry Corresponds to…”

This is the first thing my OB looked at. It simply means the baby’s physical size matches your current week of pregnancy. It’s the ultimate confirmation that growth is right on schedule.

“Normal Four-Chamber View”

My report noted “good somatic and cardiac activities.” Hearing that all four chambers of the heart are symmetrical was a massive sigh of relief, especially with a history of heart health concerns in both of my families.

“Amniotic Fluid Volume”

This measures the house where the baby lives in. An adequate volume means the baby has plenty of room to move, grow, and practice those little kicks you’ve been feeling!

Review: Hello Baby Ultrasound (Fisher Mall)

For this milestone, we availed of the CAS Pearl Package (₱5,500) at Hello Baby Ultrasound. I was impressed by their responsiveness on Facebook, which made securing an appointment easy.

The Process: We paid a ₱1,000 reservation fee (deductible from the total). Even though it was a Sunday, they had an OB-Perinatologist-Sonologist available, which is so convenient for working parents.
The Experience: The staff and doctor were incredibly patient. Since we want the gender to be a surprise for now, the doctor kindly reminded us to close our eyes”during certain parts of the scan.
Fetal Imaging: Because I have an anterior placenta and the baby was shyly hiding behind their hands, the sonologist waited patiently for the baby to move so we could get the best shots.
The Results: The entire session lasted about 40 minutes, and results were ready for pickup within an hour. I love that they kept the gender a secret for us—sealing the envelope and the framed 8R collage photo so we wouldn’t see it prematurely!

Location: Upper Ground (UG) Floor, Fisher Mall, Quezon Avenue, Quezon City.

Quick Tips for Your CAS Appointment

Hydrate, but don’t overdo it: Good hydration helps image clarity, but you don’t need an uncomfortably full bladder.
Wear a two-piece outfit: A top and skirt/pants combo is much easier than a dress for an abdominal scan.
Confirm your Plus One” If having your partner there is important to you, always verify the clinic’s policy before booking.

Looking Ahead: The Third Trimester Horizon

Walking away with our Congenital Anomaly Scan results felt like passing a major milestone. Now, our focus shifts toward the third trimester: intentionally organizing the nursery, mindful spending during the global crisis, and enjoying these final months of preparation.

Let’s Connect! Have you had your CAS yet? Did you decide to find out the gender right away, or are you keeping it a secret like us? Let’s talk in the comments!

Thank you for reading this blog post about decoding congenital anomaly scan! More to come soon. Meanwhile, here are other lifestyle blog posts you might want to check out: