Atropine Suppression Test

**Semantic type:** Diagnostic Procedure

**Definition:** A test used to help find out if secretion of pancreatic polypeptide is normal or caused by a tumor. Atropine sulfate is injected into the patient's vein and level of pancreatic polypeptide in the blood is measured. If there is a tumor, the injection will not change the level of pancreatic polypeptide. If there is no tumor, the level of pancreatic polypeptide will drop.

**Synonyms:** - atropine suppression test