Bile reflux looks a lot like acid reflux. The symptoms overlap. But the cause is completely different, and so is the approach. The Heidelberg test can tell the difference in real time.
Bile is produced by your liver and stored in your gallbladder. After you eat, it's released into the small intestine to help digest fats. It's supposed to stay there. A valve called the pyloric sphincter keeps bile from washing backward into the stomach.
When that valve doesn't close properly, bile flows back into the stomach. This creates a burning sensation that feels exactly like acid reflux. The crucial difference is that the problem isn't your acid. It's bile contaminating your stomach from below.
On the surface, bile reflux can look like hypochlorhydria. If you measured the pH of the stomach during a bile reflux episode, you'd see elevated readings. It would be easy to conclude that the stomach isn't producing enough acid.
But that conclusion would be wrong. The elevated pH isn't caused by weak acid production. It's caused by alkaline bile washing into an otherwise acidic environment. The acid-producing cells are working fine. The problem is anatomical, not secretory.
Getting this distinction wrong changes everything about how you'd approach it.
The Heidelberg test measures pH continuously in real time. Bile reflux produces a very specific pattern on the curve: sharp, erratic alkaline spikes interrupting what should be a stable acidic baseline. No challenge is being given. The spikes are coming from within.
This chaotic oscillating pattern looks nothing like hypochlorhydria, where the pH stays steadily elevated. And it looks nothing like normal function. It's distinctive, and it's visible only on a real-time pH curve.
The test can then confirm with betaine HCl that the acid-producing cells themselves are intact. The problem is the valve, not the acid.
If you've been experiencing reflux symptoms that haven't responded to standard treatment, bile reflux may be part of the picture. A Heidelberg test can help your practitioner understand whether the pattern is consistent with acid-driven or bile-driven reflux.
The Heidelberg pH Capsule is a Class I medical device, 510(k)-exempt, listed with the U.S. Food and Drug Administration under 21 CFR §876.1400. Listing of a device does not denote FDA approval, clearance, or endorsement.