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Table 2 Strength of evidence for each intervention-outcome pair

From: Interventions to prevent iatrogenic anemia: a Laboratory Medicine Best Practices systematic review

  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