Table 2.

Strength of evidence for each intervention-outcome pair

	Outcome (number of studies; strength of evidence rating)
Intervention	Test requisition	Blood loss	Decline in hemoglobin	Anemia	Transfusion
Small volume tubes	1; insufficient	2; insufficient	2; insufficient	1; suggestive	2; insufficient
Closed blood sampling devices	0; not applicable	4; moderate	7; insufficient	0; not applicable	4; insufficient
Point of care testing	0; not applicable	3; insufficient	0; not applicable	0; not applicable	2; insufficient
Bundled interventions	0; not applicable	4; suggestive	3; insufficient	0; not applicable	3; inconsistent
Education	2; insufficient	1; insufficient	1; insufficient	0; not applicable	1; insufficient