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Previous Volume 341:1477-1478 November 4, 1999 Number 19 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: In his review article on occult gastrointestinal bleeding (July 1 issue),¹ Dr. Rockey states that technetium-99m–labeled red-cell scintigraphy has been disappointing in regard to its influence on treatment. In the study he cites by Voeller et al.,² however, the scintigraphy was performed with in vivo labeling of red cells, which is known to result in the presence of free tracer (that is, various chemical forms of technetium-99m that are not associated with red cells); the free tracer is in part eliminated or concentrated in the gastrointestinal tract. This nonspecific accumulation of free tracer in the bowel cannot . . . [Full Text of this Article]

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