The compromise of uterine receptivity is one of the main reasons for the failure of assisted reproduction techniques. Leukemia inhibitory factor is one of those molecular parameters that allow us to identify an endometrium as receptive. Platelet rich plasma (PRP) contains a range of cytokines and growth factors including leukemia inhibitory factor that encourage the migration, proliferation, and differentiation of cells. Treatments for antagonist ovarian stimulation were administered to 75 women under the age of 40, and 2-D power doppler ultrasound was used to guide the oocyte harvest. Patients were allocated into three groups according to the time of intrauterine infusion of PRP (no PRP, PRP at triggering day and PRP at ova pickup day). Power Doppler is utilized to measure endometrial thickness (ET), pulsatility index (PI), and resistance index (RI) of sub endometrial arteries, as well as serum levels of leukemia inhibitory factor (LIF). The mean endometrial thickness as well as serum level of LIF in PRP trigger group were higher, resistance index and pulsatility index were lower in a significant manner than control and PRP ova pickup group at all the days of study (triggering, ova pickup and embryo transfer days). These findings revealed that intrauterine PRP infusion on ova pick up day is associated with a significant increase in serum level of LIF that in turn enhances endometrial thickness for patients scheduled for intracytoplasmic sperm injection (ICSI).