Table 1.

The Ohio State University total polypeptide panel for initial evaluation of neuroendocrine tumors

Peptide	Reference range	Elevated
Calcitonin	<5.0 pg/ml	Uncommon (10%)
Gastrin	0–122 pg/ml	Uncommon (3–18%)
Gastrin-releasing peptide	<500 pg/ml	Rare (3%)
Neurotensin	<100 pg/ml	Uncommon (10–12%)
Pancreastatin	<135 pg/ml	Common (81–100%)
Pancreatic polypeptide	<500 pg/ml	Uncommon (13–29%)
Substance P	0–240 pg/ml	Uncommon (18–19%)
Vasoactive intestinal peptide	0–84 pg/ml	Rare (<5%)

References: Calhoun et al., 2003; Varker et al., 2008; Yao et al., 2008.