Detection of vasoactive intestinal polypeptide producing tumors in patients with chronic diarrheal diseases
Fasting for at least 8 hours prior to sample collection is required
Immediatley following collection, mix sample thoroughly by gentle inverting 8 - 10 times, to prevent clotting
Frozen (strict) - 90 days
Refrigerated - NO
Ambient - NO
< 75 pg/mL
Values above 75 pg/mL may indicate the presence of an enteropancreatic tumor causing hypersecretion of vasoactive intestinal polypeptide (VIP).
Values above 200 pg/mL are strongly suggestive of VIP-producing tumors (VIPoma).
VIPoma is unlikely with a 24-hour stool volume below 700 mL.