A Parent’s Guide to the MBSS

Rachel Haskins
Jun 29
2 min read

As a pediatric Speech-Language Pathologist (SLP), I know how stressful mealtimes can be when things aren't going smoothly. If your little one is coughing during bottles, struggling with solids, or having frequent respiratory issues, your pediatrician or SLP might have mentioned a swallow study or an MBSS. But what exactly is it? And more importantly, does your child actually need one? Let’s break it down.

What is an MBSS?

The Modified Barium Swallow Study (MBSS)—also known as a Videofluoroscopic Swallow Study (VFSS)—is essentially a "moving X-ray" of your child’s swallow.

Unlike a regular X-ray that takes a still photo of bones, the MBSS is a video that allows us to see what’s happening inside the mouth and throat in real-time with eating and drinking.

How it works:

Your child is offered different textures (liquid, puree, solids).
The food or drink is mixed with barium, a safe, chalky substance that shows up on the X-ray.
As your child swallows, the SLP and Radiologist watch the "bolus" (the food/drink) travel from the mouth, down the throat, and into the esophagus.

Why do we do it?

We can see a lot from the outside, but we can't see through skin! An MBSS helps us answer three critical questions:

Is the swallow safe? Is food or liquid "going down the wrong pipe" into the airway (aspiration)?
Is the swallow efficient? Is there a lot of food left behind in the throat after the swallow?
What helps? We can try different nipple flow rates, thickened liquids, or postural changes during the study to see what immediately improves safety.

When should you get one?

Not every picky eater or messy feeder needs an MBSS. We typically recommend one if we notice concerns for dysphagia (swallowing difficulty).

1. Clinical Signs of Aspiration

If your child consistently shows these signs during or after eating:

Coughing or choking.
A "wet" or gurgly voice/breathing.
Frequent eye tearing or nose running while eating.
Color changes (turning red or blue) or gasping for air.

2. Respiratory Red Flags

Sometimes aspiration is "silent," meaning the child doesn't cough even when food enters the airway. We look for:

Recurrent pneumonia or frequent "bronchitis."
Chronic congestion that doesn't seem to go away.
Congenital heart defects or neurological conditions that impact muscle tone.

3. Significant Feeding Refusal

If a child is fearful of certain textures or refuses to eat, it might be because they feel "unsafe" while swallowing. An MBSS can rule out a physical cause for the behavior.

What to Expect on the Day

Duration: The actual X-ray portion usually lasts only 2 to 5 minutes to minimize radiation exposure.
The Chair: Infants are often placed in a specialized feeder seat, while older kids may sit in a high chair or a "booster" attached to the X-ray table.
The Team: You’ll usually meet a Radiologist (the doctor) and an SLP.
The Results: In most cases, you’ll get the preliminary results immediately!

A Quick Note: An MBSS is a diagnostic tool, not a "cure." It gives us the roadmap we need to create a safe and effective feeding therapy plan tailored specifically to your child's anatomy.

Is your child showing any of these signs? Reach out to your SLP or pediatrician to discuss whether an MBSS is the right next step for your feeding journey!