Question

Which test directly evaluates pancreatic exocrine function?

• A. Lundh test
• B. Fecal fat
• C. Pancreolauryl test
• D. NBT–PABA test

Hint:

Direct vs. Indirect Pancreatic Tests:
- Direct (Tube required): Secretin test, CCK test, Lundh test.
- Indirect (Stool/Urine/Breath): Fecal elastase, Fecal fat, NBT-PABA, Pancreolauryl.

Answer 1

The Correct Option is A

Concept:
Pancreatic exocrine function tests are categorized as either direct or indirect. Direct tests measure the actual secretion of pancreatic enzymes or bicarbonate, while indirect tests measure the secondary consequences of enzyme deficiency in the gut or feces.
Explanation:
• Direct tests involve the intubation of the duodenum to aspirate and quantify pancreatic secretions (fluid volume, bicarbonate, and enzymes) in response to a meal or hormonal stimulation.

• The Lundh test is a classic direct test. It involves administering a standard test meal (containing fat, protein, and carbohydrate) and subsequently aspirating duodenal contents via a tube to measure the concentration of trypsin.

• Other direct tests include the Secretin test and the Cholecystokinin (CCK) stimulation test.

• Indirect tests, on the other hand, are non-invasive. They include quantitative Fecal Fat estimation (Option B), the Pancreolauryl test (Option C), the NBT-PABA (Bentiromide) test (Option D), and fecal elastase-1. These evaluate the effects of exocrine insufficiency, not the direct glandular output.
Final Answer:
The Lundh test is a direct pancreatic function test requiring duodenal intubation to measure enzymatic output following a test meal.