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Tagged Red Cells

December 21, 2007

Indications
1.Acute Gastrointestinal Bleeding without source
2.Often used to preselect patients for angiography
 

Description
1.Radionuclide scan with Technetium 99m-labeled red cells
2.Labeled Red Blood Cells circulate for 48 hours
3.Identifies sites of GI Bleeding via gamma camera scan
4.Detects bleeding down to rates as low as 0.1 ml/min
 

Protocol
1.Scan should be verified by second method
   1.1.Angiography (most commonly follows tagged scan)
   1.2.Endoscopy
   1.3.Surgery
2.Scan localization is 78% accurate when verified
3.Do not base bowel resection solely on tagged cell scan
   3.1.Results frequently in recurrent bleeding (42%)
   3.2. Hunter (1990) Am J Surg 159:504-6
 

Efficacy
1.Identifies Lower GI Bleed site in 26-78% of cases
2.Most sensitive early in scanning (first 2 hours)
3.Positive scan predicts higher morbidity and mortality

Tagged Red Blood Cells Scan [fpnotebook]

For more information visit the article Diagnosis of Gastrointestinal Bleeding in Adults.

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