Four RCTs (n=292) were included.
No studies described the use of allocation concealment or blinded outcome assessment. Two trials were single-blind, one was not blind and one did not provide this information.
There was no evidence of statistically significant publication bias.
Patients receiving autotransfusion were significantly less likely to require ABT (RR 0.63, 95% CI: 0.41, 0.95, p=0.03). There was statistically significant heterogeneity in this result using a random-effects model (p=0.02). A sensitivity analysis excluding the studies with the lowest and highest RRs did not change the statistical significance of the results.