Members' NAVLE study guide

Feline Exocrine Pancreatic Insufficiency | NAVLE Guide

1,554 words 6 min read Reviewed November 14, 2026

Exocrine pancreatic insufficiency (EPI) is a maldigestion and malabsorption syndrome caused by too little production of digestive enzymes by the pancreas. In cats it is rarer than in dogs and often looks different: weight loss without a dramatic, greasy diarrhoea, and a cobalamin deficiency that can decide whether the cat recovers.

Key facts

Exocrine pancreatic insufficiency at a glance
  • Species and system: cat; exocrine pancreas (digestive system).
  • Cause: chronic pancreatitis is the most common cause in cats; clinical signs appear only after about 90% or more of exocrine function is lost.
  • Classic presentation: an adult cat with weight loss, a poor coat and loose stools, sometimes with a reduced appetite.
  • Diagnosis: serum trypsin-like immunoreactivity (TLI) at or below 8.0 mcg/L in the cat.
  • Treatment: powdered pancreatic enzymes with every meal, plus cobalamin.
  • Zoonotic or reportable: no.

What's inside

11 sections in the full guide
  1. Key facts
  2. How the NAVLE tests this
  3. Cause and pathophysiology
  4. Clinical signs
  5. Diagnosis
  6. Don't confuse EPI with
  7. Treatment and management
  8. Prognosis
  9. Quick review
  10. Test yourself
  11. References
The full guide also has 5 tables, 3 self-test questions and 6 references, available to NAVLE members.

Read the full study guide

The full guide is part of every NAVLE plan, with diagnosis and treatment tables, figures, a quick review and self-test questions. Start a free trial to try the question bank, or log in if you are already a member.

Read the free overview article A shorter, free article on Exocrine pancreatic insufficiency on the NavleExam blog.

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Feline · Gastrointestinal/Digestive