It is very uncertain whether embryo culture supernatant injection changes miscarriage compared with no intervention (very low certainty).
The review found no eligible studies for this question.
It is very uncertain whether intrauterine injection of autologous platelet‐rich plasma changes miscarriage compared with no intervention (very low certainty).
It is very uncertain whether intrauterine infusion/injection of autologous platelet‐rich plasma changes miscarriage compared with no intervention or placebo (very low certainty).
The review found no eligible studies for this question.
Repeated single embryo transfer (mixed policies) showed no clear difference in miscarriage rate compared with multiple embryo transfer (low certainty).
Single showed no clear difference in miscarriage rate compared with multiple embryo transfer (low certainty).
Day 3 showed no clear difference in miscarriage rate per woman compared with day 2 embryo transfer following IVF or ICSI (moderate certainty).
Summary of findings table ‐ ICSI showed no clear difference in miscarriage compared with c‐IVF (moderate certainty).
GnRHa depot showed no clear difference in miscarriage rates compared with gnRHa daily injection (low certainty).
It is very uncertain whether assisted hatching changes miscarriage rate per woman randomised compared with no assisted hatching (very low certainty).