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Finding the Answers: How Post-Bariatric Hypoglycemia Is Diagnosed

Getting a diagnosis for post-bariatric hypoglycemia (PBH) is a bit like piecing together a puzzle. There is no single test that confirms a diagnosis right away; instead, your healthcare team will gather clues, look for patterns, and work to rule out other conditions.

Only your healthcare team can tell you whether what you're experiencing is PBH. Here's what that journey might look like.

Illustration of person looking at a mobile phone through magnified view

Your Healthcare Team

Who Might Help You Uncover the Mystery?

Depending on where you are in your journey, several different people may be involved in uncovering what you are experiencing.

Here’s what your journey might look like:

Stage 01:
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Primary care provider (PCP) or surgical care team

This might be where your journey starts. Whether it's a PCP who hears your concerns and arranges early tests, or a bariatric team who can link symptoms back to your surgery, this is where the pieces can start to come together.

If low blood sugar may be involved...
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Stage 02:
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Endocrinologist 

A PCP or bariatric team may refer you to an endocrinologist, a specialist in hormones and blood sugar. They can help confirm what's happening, explain test results, and begin to talk through ways of managing symptoms.

As the picture becomes clearer…
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Stage 03:
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Dietitian

A dietitian, particularly one with experience in PBH, may be involved to help support meal planning and managing PBH through diet.

Resource: Doctor Discussion Guide

Sometimes it's hard to know where to begin. A doctor discussion guide may help you feel more prepared for your next conversation with your healthcare team.

Download

How PBH Is Diagnosed

Gathering the Clues: What Your Healthcare Team Might Ask

The first step in uncovering what's going on starts with a conversation with your healthcare team. They will want to understand more about your symptoms, when they happen, and how they relate to meals.

You might be asked questions like:

  • When do symptoms tend to show up?
  • How long after eating do they start?
  • What do they feel like in the moment?
  • What did you eat before the symptoms started?
  • What helps with feeling better?
  • Has help ever been needed from someone else during an episode; for example, at work, while driving, or at night?

These questions help your healthcare team build a picture to see if your symptoms fit the pattern of PBH. The more information that you can give, the more clues they have to work with.

Illustration of stomach anatomy, meal imagery, and person appearing confused

Resource: Episode Tracker

This tracker is designed to help you record your episodes and share them with your healthcare team. Recording entries consistently over time may help reveal patterns that are hard to spot from a single episode.

Download

Blood Tests

Confirming the Clues: Checking Blood Sugar

Once your healthcare team has a clearer picture of your symptoms, the next step they may take is to check whether low blood sugar could be the culprit. This might involve:

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A finger-prick blood sugar check during an episode

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A blood sample taken while symptoms are happening

Your healthcare team will often look to see if these three clues happen together:

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Symptoms of low blood sugar

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Low blood sugar levels at the same time as symptoms

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Symptoms improve when blood sugar rises

If all three line up, it helps your healthcare team understand that low blood sugar may be driving your symptoms.

Considering Other Possibilities

When the Clues Point in More Than One Direction

Some conditions that can develop after bariatric surgery share similar symptoms to PBH. Sharing your experience and symptoms with your healthcare team will help them identify what’s really going on.

One condition that is sometimes confused with PBH is dumping syndrome. Looking at them side by side can help show the differences. 

PBH

Dumping Syndrome

Linked to bariatric surgery

PBH

Yes

Dumping Syndrome

Yes

When symptoms appear

PBH

Usually 1–3 hours after eating

Dumping Syndrome

Usually 15–60 minutes after eating

Low blood sugar

PBH

Yes

Dumping Syndrome

No

Examples of what people may notice

PBH

Shakiness, sweating, confusion, fatigue, racing or pounding heart

Dumping Syndrome

Stomach cramps, diarrhea, flushing, nausea, racing or pounding heart

This is just a snapshot of the differences between these two conditions. Your healthcare team will be able to discuss this further and help you understand what might be going on for you specifically.

Preparing For Appointments

Small Steps That Can Makes Appointments Easier

Going into an appointment with as much information as possible can make a real difference. If you think you may be experiencing symptoms of PBH, here are a few things worth bringing or thinking about before your appointment:

  • Writing down when symptoms happen
  • Noting activities and what you ate before symptoms started
  • Recording what helped you feel better
  • Bringing a support person
  • A list of any medications being taken
  • Any questions you want to make sure you ask

More information allows your healthcare team to move closer to identifying answers.

Illustration of stomach anatomy, plated meal, and person experiencing dizziness
Portrait of woman named Cindy

“I think it's extremely important to journal about your episodes. It's the first thing you'll be asked for at the doctor and is critical to help guide their thinking so they can fight for you. Journaling also helped me realize this isn't all in my head and it was real.”

— Cindy, person with PBH

Next Clue

What Can Help

Explore ideas for how people can navigate living with PBH.