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What do systematic reviews say?

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Evidence found and GRADE certainty

4 questions · 5 findings · 1 reviews · Injuries

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No studies found 3 · 60%GRADE not reported 0 · 0%Very low 0 · 0%Low 2 · 40%Moderate 0 · 0%High 0 · 0%

Intravenous iron vs oral iron

Ferritin (µg/L) · people with preoperative anaemia awaiting major surgery

Intravenous iron therapy may leads to higher ferritin preoperatively postintervention (ng/L) compared with oral iron therapy (low certainty).

1 finding from 1 review

Intravenous iron vs oral iron

Haemoglobin (g/dL) · people with preoperative anaemia awaiting major surgery

Intravenous iron therapy may leads to higher haemoglobin levels at end of preoperative treatment (g/dL) compared with oral iron therapy (low certainty).

2 findings from 1 review