Treatment with omeprazole or pantoprazole prior to urea breath test ( UBT ) was associated with low false negative results , while lansoprazole and esomeprazole caused clinically unacceptable high false negative rates ( pantoprazole 2.2 % vs. lansoprazole 16.6 % , P = 0.02 , vs. esomeprazole 13.6 % , P = 0.05 ; omeprazole 4.1 % vs. lansoprazole 16.6 % , P = 0.05 ) .
