The sperm motility test is one of the most important items in semen analysis. As the name suggests, motility is the ability of sperm to move. When a woman has intercourse during ovulation, there will be hundreds of millions of spermatozoa in the battle, and only one will win in the end. We first understand the grading of sperm vitality, sperm vitality is divided into a total of four levels of A/B/C/D, A-class sperm is the best, they are straight-line accelerated movement of sperm; B-class sperm is arc fast movement of sperm; C-class sperm also known as non-forward motion sperm, sperm tail moving, but the sperm fixed point does not move, microscopic observation of sperm “trembling “Class D sperm, or inactive sperm, may be dead or alive, but not active. In short, the sperm that can make women conceive naturally is A+B, that is, forward motion sperm, the foreign point is called PR, PR is the elite soldiers, if the PR ratio reaches 50%, we say it is excellent, of course the passing line is also there, 32% is equivalent to a score of 60. See here, the brothers should have a scientific understanding of sperm vitality, so to have children, the PR up is the hard truth.