The severity classification of weak spermatozoa is based on the percentage of sperm containing each grade of sperm and their number. Sperm are categorized into 4 grades according to their motility. According to the mobility grading of sperms are categorized as a, b, c, d, 4 grades. Among them, sperm of grade a refers to the sperm with the highest mobility and grade d is the worst mobility. 1. Mild sperm weakening: 30% < grade a+b < 50%, or 10% < grade a < 25%. 2. Moderate weak spermatozoa: 30%