Sperm motility describes how sperm move under the microscope. Progressive motility means sperm move actively in a fairly straight line; non-progressive motility means sperm move but do not travel in a purposeful direction; immotile sperm show no movement at all. Total motility is the proportion showing any movement, while progressive motility is often considered most relevant to natural fertility because it reflects the ability to travel toward and reach an egg. Reduced motility, called asthenozoospermia, can result from infection, varicocele, heat exposure, certain medicines, oxidative stress or unclear causes, and can occur alongside normal sperm counts. A low motility result on its own does not describe the sperm as "weak"; it is one measurement that guides further assessment and treatment choice, including IUI, IVF or ICSI where appropriate.
Also known as: low motility, weak sperm movement, poor sperm motility
Related India guides
Sources
- World Health Organization (who.int)
- ICMR Standard Treatment Workflows (icmr.gov.in/standard-treatment-workflows-stws)
Last reviewed: 9 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.