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What do systematic reviews say?

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Evidence found and GRADE certainty

1,155 questions · 1,191 findings · 195 reviews · Headline outcomes only

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No studies found 209 · 17.5%GRADE not reported 51 · 4.3%Very low 256 · 21.5%Low 273 · 22.9%Moderate 284 · 23.8%High 118 · 9.9%

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

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