- Use ranitidine 1 mg/kg i.v. (maximum 50 mg), infused over 20 min and start imaging one hr later. Alternatively 150 mg p.o. is also adequate.

- Also consider omeprazole 1 mg/kg/day either intravenously or p.o. 1-2 h previous to 99m Tc administration.

- Likewise, consider lansoprazole 1.5 mg/kg/day either intravenously or p.o. 1-2 h previous to 99m Tc administration.

1  ALLAN O. Santos, Elba C. S. C. Etchebehere, P. Garcia Alonso y EDWALDO E. Camargo. HEMORRAGIAS DIGESTIVAS , p: 249-257 in: Medicina Nuclear Aplicaciones Clínicas. Eds: I. Carrio - P. González. Editorial Masson, Barcelona España, 2003.

2  Patrick V. Ford et al. Procedure Guideline for Gastrointestinal Bleeding and Meckel’s Diverticulum Scintigraphy 1.0 SOCIETY OF NUCLEAR MEDICINE PROCEDURE GUIDELINES MANUAL 2001-2002: 41-48.

3 Peredo MS and Harris P. Proton Pump Inhibitors in Pediatrics: A Battle won against acidity. Rev Chil Pediatr 2004; 75(3): 217-24.