Protein-losing enteropathy

Quick Anchor

Recognize PLE fast.

Suspect PLE when chronic GI signs are accompanied by significant hypoalbuminemia, weight loss, edema, ascites, or pleural effusion. Some dogs present mainly for fluid accumulation or weakness rather than obvious diarrhea.

• Intestinal lymphangiectasia and severe chronic enteropathy are classic causes.
• Intestinal lymphoma is an important malignant differential.
• Hypocholesterolemia, hypocalcemia, and lymphopenia can support the impression of intestinal lymphatic disease.

Exam Core

Localization is the key test skill.

The main exam question is often, “Where is the protein going?” Before calling it PLE, exclude urinary protein loss and reduced hepatic synthesis. Once GI loss is most likely, the next job is identifying whether inflammatory, lymphatic, or neoplastic disease is driving it.

• Rule out kidney loss: urine protein assessment matters because proteinuria can also drop albumin.
• Rule out liver failure: severe hepatic synthetic failure can also produce hypoalbuminemia.
• Support GI loss: fecal alpha-1 proteinase inhibitor, GI imaging, and intestinal biopsies can help define the cause.
• Look for complication markers: low antithrombin increases concern for thromboembolism.

Decision Core

Treatment priorities.

• Stabilize the consequences: address fluids, oncotic compromise, and effusions based on severity.
• Treat the cause: ultra-low-fat diets are especially important in intestinal lymphangiectasia; inflammatory disease may need immunomodulatory therapy.
• Support nutrition: cobalamin replacement and carefully selected diets matter.
• Think about thrombosis risk: severe hypoalbuminemia or low antithrombin can justify antithrombotic planning.
• Do not skip diagnostics forever: these dogs often need imaging and biopsy to direct therapy appropriately.

High-Yield Traps

Where exam stems misdirect you.

• PLE is not the same thing as “IBD”; it is a protein-loss syndrome with several causes.
• Edema or ascites in these dogs is not necessarily cardiac disease.
• Absence of severe diarrhea does not exclude intestinal protein loss.
• Low albumin alone is incomplete reasoning; look at urine and liver function too.
• These dogs can clot abnormally in the direction of thrombosis, not just bleeding.

Rapid Revision

Last-minute recall.

• PLE = intestinal protein loss causing hypoalbuminemia and often hypoglobulinemia.
• Main causes include severe chronic enteropathy, lymphangiectasia, and lymphoma.
• Edema and effusions reflect decreased oncotic pressure.
• Always exclude renal and hepatic explanations for low albumin.
• Low-fat nutrition is especially important in lymphangiectasia-associated disease.

Practice

Board-style checks.