Principle: Meckel’s diverticulum in 20% contains a functional ectopic gastric mucosa that uptakes the radiopharmaceutical. Indications: suspected bleeding Meckel’s diverticulum suspicion of ectopic gastric mucosa Patient preparation: fasting Duration of examination: approx. 60 minutes Radiopharmaceutical: 99mTc – pertechnetate Method of application: Intravenous Examination methodology: The patient lies down on the gamma table and the radiopharmaceutical is injected intravenously. Immediately after completion of the application, dynamic scanning is started and the abdomen is carefully observed for any saturated accumulation of radiopharmaceutical indicative of positivity. The scan lasts approximately 60 minutes.  To increase the sensitivity and specificity of the examination, targeted SPECT is added to the Principle.