was performed by using chi-square analysis or Mann-Whitney U test where appropriate with significance determined by a p¼0.05.RESULTS: In AMA group (n¼326, average age: 41.8AE2.6 years, range: 38-51), ERPeak SM testing showed a NR result in 144 patients (44.2%) and a R result in 182 patients (55.8%). In the NRgroup, 66.7% (96/144) indicated a pre-receptive state and 33.3% (48/144) resulted in post-receptive state. In non-AMA group (n¼154, average age: 34.0AE2.7 years, range: 20-37), ER-Peak SM testing showed a NR result in 65 patients (42.2%) and a R result in 89 patients (57.8%). In the NR group, 52.3% (34/65) indicated a pre-receptive state and 47.7% (31/65) resulted in post-receptive state. The rate of prereceptive state in the AMA group was significantly higher than the non-AMA group (p<0.05). After pET with morphologically good quality embryos for NR patients, we found that the clinical pregnancy rate (CPR) and implantation rate (IR) were similar between NR and R patients (37.4% vs. 37.9% and 30.3% vs. 25.3%, respectively), which is consistent with previous studies of pET based on the ERA test. Among NR patients, pET for AMA group (n¼73, average age: 41.0AE1.9 years) and non-AMA group (n¼50, average age: 34.4AE3.2 years) showed similar CPR (34.2% vs. 42.0%, p¼0.38), IR (27.4% vs. 31.3%, p¼0.58), miscarriage rate (20.0% vs. 19.0%, p¼0.94) and live birth rate (75.0% vs. 82.4%, p¼0.59), respectively.CONCLUSIONS: Although maternal age did not influence the frequency of NR, a pre-receptive status detected by ERPeakSM was more frequently observed in AMA patients. pET after ERPeak SM testing may improve reproductive outcomes of AMA patients with RIF.IMPACT STATEMENT: Endometrial receptivity test may be useful especially for AMA patients. Embryos were selected for transfer by morphology alone, rather than chromosomal screening, which may have affected the clinical outcome. Further studies are required.