Can there be oxidative stress in spermatozoa if the seminogram is normal?

Antonio Forgiarini from Next Fertility Valencia tells us whether oxidative stress may be present even though the results of the semen analysis are normal:

Well it's not usual. Normally if we ask or if we have oxidative stress, it will reflect in the seminal parameter, so we have a few spermatozoa or they're not moving correctly, but sometimes it could happen. We can suspect that we have some problem of oxidative stress so some damage in the DNA chain of the spermatozoa when we have bad results with a normal semen and good or sides so a low fertilization so the embryo will not develop correctly to blastocyst or we have some problem like miscarriages when we don't know any other cause so sometimes it's the case to investigate about this reason.