GI Endoscopy · 7 min read
EGD Does Not Diagnose GERD: LA B-D, Barrett, or Stricture Do
A normal esophagus does not exclude reflux. LA A is not conclusive GERD. LA B and worse, Barrett, and peptic stricture are.
Endoscopy sees injury. It does not see acid. ACG 2022 (Katz, PMID 34807007) still lets typical heartburn without alarm start with an empiric PPI. Lyon 2.0 (Gyawali, PMID 37734911) is the testing lexicon: LA B, C, or D, biopsy-proven Barrett, and peptic stricture are conclusive endoscopic GERD. LA A is not, because healthy people have it.
Experienced teaching points
Clinical Pearls
- Honor the slug: endoscopy does not detect GERD. It detects complications of GERD.
- Lyon 2.0 upgraded LA B to conclusive. That is the change from Lyon 1.0. LA A still needs pH if the question is GERD.
- Typical symptoms, no alarm: 8 weeks of daily PPI is reasonable without an index EGD (ACG 2022).
- Alarm, failed PPI, or Barrett screening criteria: that is when you scope.
- LA C/D healing and PCABs: vonoprazan vs lansoprazole. Prague and Seattle: Barrett page. Rings after inflammation: EoE.
Clinical Bottom Line
| Finding | What it means for GERD |
|---|---|
| Normal EGD | Does not exclude GERD. NERD is still a pH or pH-impedance diagnosis if you need one. |
| LA A | Mucosal break 5 mm or less. Seen in healthy volunteers. Lyon 2.0: inconclusive. Do not treat it as proven GERD by itself (PMID 37734911). |
| LA B, C, D | Conclusive endoscopic evidence of GERD. B is at least one break longer than 5 mm that does not bridge folds. C bridges folds. D is 75% or more circumferential. |
| Barrett or peptic stricture | Also conclusive. Technique for Barrett is not this page. |
| When to scope | Alarm, inadequate response after about 8 weeks of PPI, or selected Barrett screening (ACG 2022, PMID 34807007). Not to 'confirm GERD' in typical uncomplicated heartburn. |
So can endoscopy detect GERD?
No. That is the honest answer to the slug. Lundell 1999 (PMID 10403727) gave us a shared language for erosions. It did not turn EGD into a reflux test. Most heartburn patients have a normal esophagus. If you need proof in that group, you measure acid, off therapy if GERD is unproven, on therapy if GERD is already proven and symptoms persist (Lyon 2.0).
The leftover stub treated LA A as mild disease that 'usually responds perfectly' and LA D as a LES that is 'profoundly incompetent.' Grade is injury, not a manometry reading. LA C and D do mark a high acid burden and a stricture risk. Healing them is a PPI or PCAB problem. Step-up data live on the vonoprazan page.
What did Lyon 2.0 change about LA B?
Original Lyon treated LA A and B as inconclusive. Lyon 2.0 (Gyawali, Gut 2024, PMID 37734911) moved B into the conclusive column with C and D, because B is uncommon in healthy people and acid exposure looks like C. A is the grade that shows up in 5-7.5% of healthy subjects. Quote that when someone wants to stop a workup because 'there was a little esophagitis.'
ACG 2022 still starts typical, no-alarm heartburn on a PPI. Scope when the story is wrong, the drug failed, or Barrett risk is the reason you are there. Extraesophageal complaints (cough, globus, throat clearing) are a poor reason for an empiric PPI without a better reflux workup. Do not restage Prague, Seattle, or ablation here: Barrett page. Dilation of a peptic stricture: esophageal dilation.
Selected references
- Katz PO, et al. ACG Clinical Guideline for the Diagnosis and Management of Gastroesophageal Reflux Disease. Am J Gastroenterol. 2022;117:27-56.
- Gyawali CP, et al. Updates to the modern diagnosis of GERD: Lyon consensus 2.0. Gut. 2024;73:361-371.
- Lundell LR, et al. Endoscopic assessment of oesophagitis: further validation of the Los Angeles classification. Gut. 1999;45:172-180.
Last reviewed September 20, 2026. Written for clinicians asked whether an endoscopy will 'detect GERD' and whether a LA A report means the PPI can stop.
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