Review
Copyright ©The Author(s) 2022.
World J Gastrointest Endosc. May 16, 2022; 14(5): 267-290
Published online May 16, 2022. doi: 10.4253/wjge.v14.i5.267
Table 6 Diagnosing pancreatic neuroendocrine tumors[136,174]

Diagnostic evaluation
All pancreatic NETMultiphasic CT/MRI
If results impact management, gallium DOTATATE PET CTEUS with biopsy
Insulinoma72 h fast test: Hypoglycemia with elevated insulin
Oral glucose tolerance test: May be necessary in minority with only postprandial hypoglycemia
GastrinomaFasting gastrin 10 times upper limit of normal + gastric pH < 2
If gastrin less elevated + gastric pH < 2, measure BAO with secretin test
BAO > 15 mEq/h or serum gastrin increase > 120 pg/mL
GlucagonomaFasting serum glucagon > 500 pg/mL
SomatostatinomaFasting plasma somatostatin > 30 pg/mL
VIPomaLarge volume diarrhea + serum VIP > 75 pg/mL