A 54 years old man who has had a Billroth two procedure for pepric ulcer disease now presents with abdominal pain and is found to have recurrent ulcer disease. The physician is considering this patient illness to be secondary either to retained antrum or to gastrinoma. Which of the following tests would best differentiate the two conditions? 1- Random gastring level 2- Determination of 24-hour acid production 3- Serum Calcium level 4- Secreting infusion 5- Insulin induced hypoglycaemia From: Pre Test Medicine 12th
Secretin infusion. If its due to returned antrum, gastrin levels will drop, but the gastrin level remains elevated in gastrinoma.