Sperm linear viability, which is the percentage of sperm moving forward, should generally be greater than 32% to be normal. If the sperm linear viability is low, the possibility of conception will be reduced in this case. The sperm liquefaction time, the PH value of the semen and the total sperm survival rate are also very important factors. For sperm with low linear viability it may not be easy to swim forward faster and the probability of conception will be significantly affected. It is advisable to take zinc supplements, which can improve sperm viability and help a lot in getting pregnant.