Fasting plasma somatostatin greater than 30 pg/mL. SRS (Somatostatin Receptor Scintigraphy) – It is a radio-nucleotide scan by giving Octreotide tagged with Indium111 isotope, which shows an increase in uptake by the tumour cells.
Somatostatinoma
VIPoma
Glucagonoma
Gastrinoma
Insulinoma
Glomus tumor
Gangliocytic paraganglioma
Metastatic insulinoma