Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

959 questions · 987 findings · 78 reviews · Haematology

No studies found 256 · 25.9%GRADE not reported 64 · 6.5%Very low 207 · 21%Low 247 · 25%Moderate 163 · 16.5%High 50 · 5.1%

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

Clinical worsening: need for invasive mechanical ventilation, or death at up to day 28 · individuals with moderate to severe disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in clinical worsening: need for invasive mechanical ventilation, or… compared with placebo or standard care alone (high certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

Admission to hospital or death within 28 days · outpatients withmild disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in admission to hospital or death within 28 days compared with placebo or standard care alone (low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

Time to symptom resolution · outpatients withmild disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in time to symptom resolution (absolute effect calculated for day 12) compared with placebo or standard care alone (low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs standard plasma

All‐cause mortality at up to day 28 · outpatients withmild disease

It is very uncertain whether summary of findings table ‐ Convalescent plasma changes all‐cause mortality at up to day 28 compared with standard plasma (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs standard plasma

Admission to hospital or death within 28 days · outpatients withmild disease

Summary of findings table ‐ Convalescent plasma probably leads to lower admission to hospital or death within 28 days compared with standard plasma (moderate certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs standard plasma

Resolution of symptoms · outpatients withmild disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in symptom resolution‐ all initial symptoms resolved compared with standard plasma (low certainty).

2 findings from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

Clinical improvement: participants discharged from hospital ‐ not reported · individuals with moderate to severe disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in clinical improvement: participants discharged from hospital compared with placebo or standard care alone (high certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

Grades 3 and 4 adverse events · individuals with moderate to severe disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in grades 3 and 4 adverse events compared with placebo or standard care alone (low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

Serious adverse events ‐ total · individuals with moderate to severe disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in serious adverse events ‐ total compared with placebo or standard care alone (moderate certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs standard plasma

All‐cause mortality at up to day 28 · individuals with moderate to severe disease

It is very uncertain whether summary of findings table ‐ Convalescent plasma changes all‐cause mortality at up to day 28 compared with standard plasma (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs standard plasma

Clinical worsening: need for invasive mechanical ventilation, or death at up to day 28 · individuals with moderate to severe disease

It is very uncertain whether summary of findings table ‐ Convalescent plasma changes clinical worsening: need for invasive mechanical ventilation, or… compared with standard plasma (very low certainty).

1 finding from 1 review