**Note: All laboratory testing requires an authorizing physician. DHA Laboratory offers a patient direct program that partners you with an authorizing physician. If you have any additional questions regarding the availability of testing, please contact our laboratory by telephone or email.**
This test is used to measure the Vasoactive Intestinal Polypeptide (VIP) level in the blood. A very high level is usually caused by a VIPoma. This is an extremely rare tumor that releases VIP.
VIP is a substance found in cells throughout the body. The highest levels are normally found in cells in the nervous system and gut. VIP has many functions, including relaxing certain muscles, triggering the release of hormones from the pancreas, gut, and hypothalamus, and increasing the amount of water and electrolytes secreted from the pancreas and gut.
Patient Preparation: Patient must not have received radioactive substances 24 hours prior to test.