Summary: For patients with severe acute upper gastrointestinal bleeding, a more restrictive transfusion threshold (Hb < 7) may lead to a lower risk of death by 6 weeks (as well as a lower risk of re-bleeding and a lower risk of adverse events) than a more liberal transfusion threshold (Hb < 9).

http://www.ncbi.nlm.nih.gov/m/pubmed/23281973/

Strength of Recommendation = B

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