ISRCTN09447850.

Study name	Pre In vitro fertilisation (IVF) pipelle biopsy following a previous unsuccessful IVF cycle
Methods	RCT
Participants	Women undergoing an IVF cycle with a history of one or more previous unsuccessful IVF cycles despite having good quality embryos transferred.
Interventions	Intervention: gentle scratching (biopsy) is to be performed on Day 21 of the cycle preceding IVF Control: no procedure
Outcomes	Clinical pregnancy
Starting date	25 April 2012
Contact information	Dr G Srivastava: garima.srivastava@homerton.nhs.uk
Notes	Trial registration status on 9 Februsry 2019: no longer recruiting. We undertook correspondence with authors who reported that the study has completed but that no report is available.