<prompt> All are true about Zollinger-Ellison syndrome except:Recurrent ulceration after acid reducing surgeryRaised gastrin levels in all casesDecreased BAOMAODiarrhea  <response>: Ans. c Decreased BAOMAOBlood levels of ZES: 100 all patients will have Se. gastrin 100pgml BAO 15meqhr in most patients BAO will be 60 of MAO BAO - Basal Acid output, MAO - Maximal Acid Output Levels of Se. Gastrin 1000pgml is diagnostic If there is only borderline elevation provocative tests with secretin, Calcium etc are done With Secretin stimulation gastrin increases 200pgml in 15 minutes is diagnostic 