A recent article by Garofalo and Abdu1 is a retrospective study of scintigraphies performed between 1989 and 1992; hence, it does not seem to be relevant enough to make such strong conclusions as were made by the authors. Moreover, to tag the red blood cells, the authors used the in vivo technique that is known to be less accurate than are other techniques. Garofalo and Addie have stated:
the scintigraphic examination is done immediately and repeated every 15 minutes for 1 hour. The examination is then reviewed by the radiologist, and delayed examinations are done, if ordered up to 24 hours after initial labeling.1
In their recently published article, Maurer et al stated:
Two recent advances have significantly improved the ability of labeled red cell imaging to localize and to detect sites of active gastrointestinal (GI) bleeding. The first is the use of continuous dynamic imaging. The second