Diagnosis and treatment of iron-deficiency anemia in gastrointestinal bleeding: A systematic review

Table 3 Erythrocyte transfusion: Guidelines for hemoglobin thresholds and targets

Professional association	GI etiology	Threshold Hb, g/dL	Threshold Hb cardiovascular disease, g/dL	Target Hb, g/dL	Target Hb cardiovascular disease, g/dL
The International Consensus Upper Gastrointestinal Bleeding Conference Group[38]	Nonvariceal UGIB	< 7	-	-	-
Baveno IV Consensus Workshop[43]	Variceal bleeding	7-8	-	-	-
European Crohn's and Colitis Organization[10]	IDA in IBD	< 7	-	-	-
Hong Kong Society of Gastroenterology, the Hong Kong IBD Society, the Hong Kong Society of Digestive Endoscopy, and the Hong Kong Red Cross Blood Transfusion Service[13]	Acute UGIB	7-8	9-10	-	-
The 2018 Patient Blood Management International Consensus Conference[39]	Acute GIB	7-8	-	-	-
British Society of Gastroenterology[40]	Acute LGIB	< 7	8	7-9	10
National Institute for Health and Care Excellence[41]	N/A	< 7	8	7-9	8-10
Strate et al[42]	Acute LGIB	-	9	> 7	> 9

GIB: Gastrointestinal bleeding; Hb: Hemoglobin; IBD: Intestinal bowel disease; IDA: Iron-deficiency anemia; LGIB: Lower gastrointestinal bleeding; UGIB: Upper gastrointestinal bleeding.