Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

134 questions · 136 findings · 11 reviews

No studies found 31 · 22.8%GRADE not reported 2 · 1.5%Very low 43 · 31.6%Low 46 · 33.8%Moderate 10 · 7.4%High 4 · 2.9%

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

Iron therapy vs No treatment, placebo, usual care, or another oral care measure

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

Iron therapy showed no clear difference in haemoglobin levels at end of preoperative treatment (g/dL) compared with placebo, no treatment or standard care (low certainty).

2 findings from 1 review