What do systematic reviews say?

Intravenous iron vs oral iron

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

• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  MD 395.03 [227.72, 562.35]
  2 studies · 151 participants
  Low

Intravenous iron vs oral iron

The review found no eligible studies for this question.

• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intravenous iron vs oral iron

The review found no eligible studies for this question.

• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intravenous iron vs oral iron

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

• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  MD 1.23 [0.8, 1.65]
  2 studies · 172 participants
  Low
• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

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

Iron therapy showed no clear difference in proportion of participants who received a blood transfusion compared with placebo, no treatment or standard care (low certainty).

• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  RR 1.21 [0.87, 1.7]
  4 studies · 200 participants
  Low

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

• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  no estimate extracted
  1 study · 72 participants
  Very low

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

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).

• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  MD 0.63
  2 studies · 83 participants
  Low
• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  MD 0.17
  2 studies · 86 participants
  Low

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

Iron therapy may leads to higher ferritin at the end of preoperative treatment (ng/mL) compared with placebo, no treatment or standard care (low certainty).

• Iron therapy for preoperative anaemia 2019 · Cochrane Headline outcomes only
  MD 149 [25.68, 272.32]
  1 study · 76 participants
  Low