AIM: The effect of platelet-rich autoplasma on endometrial thickness and receptor sensitivity to estrogen and progesterone. MATERIALS AND METHODS: This prospective clinical study included 200 patients. The participants in the study were divided into two groups. The first control group received hormone replacement therapy (HRT). The second study group received an intrauterine infusion of platelet-rich autoplasma (PRP group). On the 19th day of the menstrual cycle, an ultrasound examination was performed to assess endometrial thickness, as well as an immunohistochemical analysis to determine receptor sensitivity to estrogen and progesterone. RESULTS: In the course of the study, we found that the use of platelet-rich autoplasma increased the thickness of the endometrium by 0.85 mm; the average thickness of the endometrium in the group who received PRP therapy was 8.25 (8.25-8.61) mm; and in the group of patients who only received HRT, it was 7.40 (7.34-7.65) mm. The sensitivity of receptors to estrogen in the experimental group increased by 3.5, in the experimental group it was 75.00 (71.43-74.22), and in the control group it was 71.50 (67.05-70.85). The sensitivity of receptors to progesterone also increased by 9.0, in the experimental group it was 95.0 (91.4-93.8), and in the control group it was 86.0 (83.47-86.27). CONCLUSION: Due to the action of platelet factors, PRP therapy has a positive effect on the endometrium, increasing its thickness and improving its receptivity. Therefore, it can be concluded that this method can find great practical application to improve the outcomes of assisted reproductive technology programs.

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