Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

20 questions · 22 findings · 3 reviews

No studies found 3 · 13.6%GRADE not reported 0 · 0%Very low 2 · 9.1%Low 13 · 59.1%Moderate 4 · 18.2%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

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