Which of the following is the single most impoant parameter in semen analysis to assess chances of conception in an infeile male?

Since we are to determine chances of future conception here in an infeile male, for assisted reproductive techniques the single most impoant requirement is a sperm with a normal morphology as even a single such sperm can be used to feilize an oocyte in ICSI. Without normal morphology, even multiple motile sperms would fail to feilize the egg. The normal WHO semen analysis (2010). Parameter Lower Reference Limit Semen volume (ml) 1.5 Sperm concentration (106/ml) 15 Total sperm number (106/ejeculate) 39 Progressive motility (PR, %) 32 Total motility (PR+NP, %) 40 Vitality (live sperms, %) 58 Sperm morphology (NF, %) 4 pH* >/=7.2 Leucocyete* (106/ml) <1 MAR/Immunobead test*(%) <50