Poor sperm motility often has no noticeable symptoms, so it is usually discovered only when a couple has trouble conceiving. This chapter covers how it is tested. It describes at-home semen analysis kits for quick screening, which detect a protein called SP-10 found only in the testicles, and explains what they can and cannot tell you. It then walks through clinic-based testing, from giving a semen sample to the laboratory analysis, which offers a more detailed and confirmatory result, and touches on the value of being tested before fertility problems arise.