Moving from peripheral blood to local uterine immunophenotype analysis in patients with poor reproductive history: pilot study of a novel technique.

FCM is widely used to assess cellular populations, but not typically employed for endometrial evaluation. FCM provides a rapid, detailed, and quantitative analysis and reduces inter-observer subjectivity bias. Detailed understanding of the normal endometrial immunophenotype, and associated deviations, may provide insight into the aetiology of infertile patients labelled "unexplained". Failure despite transfer of high grade, or proven euploid blastocysts, is a difficult problem, and endometrial profiling may help identify research areas to determine potential future therapeutic interventions for this difficult to treat population.