48% is not considered weak if it is the percentage of sperm with rapid forward movement; however, it is considered weak if it is the percentage of sperm with forward movement or the percentage of active sperm. According to the World Health Organization standards for semen analysis, a man’s semen should have a percentage of spermatozoa with rapid forward motion greater than or equal to 25%, a percentage of spermatozoa with the sum of rapid forward and chronic forward motion greater than or equal to 60%, and a percentage of spermatozoa that are able to move forward greater than or equal to 60%, and if it is less than that, it is considered to be weak spermatozoa. Weak spermatozoa refers to a decrease in the motility of sperm, which can lead to a decrease in the likelihood of a woman becoming pregnant. If weak spermatozoa is present, it should be diagnosed and treated by a doctor.