Normal sperm count or concentration as defined by WHO Lab Manual for Examination & Processing of Human Semen includes a concentration of 15 million per milliliter of semen. In addition, at least 40 percent of the sperm should have normal motility. Shape is evaluated by looking at 300 sperm and judging them against a “perfect sperm shape”. This process called the Krueger Strict Morphology, is felt to be “normal” if 4% of the sperm meet this stringent criteria. However, these values can slightly vary depending on the laboratory that analyzes the semen sample.