A semen analysis is a central component of laboratory testing in ... The semen specimen is examined under a microscope to determine the concentration, motility (movement) and morphology (appearance ...

Just because a sperm is a strong swimmer doesn't necessarily mean it has the right amount of DNA, Dr. Lisa Lee told Newsweek.

In 1677, just twenty years after William Harvey's death, Dutch scientist Antonie van Leeuwenhoek created a microscope powerful enough to magnify the sperm found in semen. Because Harvey could not ...