Girard JM, et al. - The association between early beta human chorionic gonadotrophin (βhCG) rise, blastocyst morphology and pregnancy evolution in a single-blastocyst transfer program was evaluated. Findings revealed differences in early β-hCG kinetics after single-blastocyst transfer according to pregnancy outcome. β-hCG kinetics was noted to be only slightly influenced by blastocyst quality. Findings thereby confirm the interest of β-hCG follow up in IVF pregnancies, and do not support the interest of building blastocyst-specific β-hCG ranges in IVF cycles.