“…The definition of HA, as proposed by Burkman, is commonly used and includes all the following criteria: VCL ≥ 100 µm/s, LIN ≤ 65 %, and ALH ≥ 7.5 µm) [71]. In a previous report using this algorithm and the Hamilton-Thorn sperm analyzer, we noted that the proportion of sperm exhibiting HA under capacitating conditions was 21.4 % in normal men [72]. The clinical significance of determining sperm HA is reflected by its correlation with IVF outcomes and natural pregnancy rates [73].…”