Sperm Viability Lab forward motility of 31.34% means that when a man undergoes a routine semen test, the forward motility of sperm is 31.34%, which means that forward-moving sperm make up 31.34% of the total number of sperm, which indicates that the patient is suffering from weak spermatozoa. The fifth edition of WHO indicated that normal male sperm forward motility should be greater than 32% and normal sperm morphology greater than 4%. The current sperm viability assay forward motility of 31.34 indicates that the forward motility of sperm is 31.34%, which is less than 32%, thus indicating that the patient is suffering from weak spermatozoa. Forward motility of 20%-32% of sperm is known as mild spermatospermia. Weak spermatozoa may be caused by long-term smoking, alcohol abuse, mycoplasma infection of the reproductive system, varicocele, and spermatogenic dysfunction of the testes. Patients with weak spermatozoa may have no obvious discomfort symptoms. Some patients may experience discomfort symptoms such as impotence, decreased libido, physical weakness, mental weakness, and lumbar and knee tenderness (a feeling of soreness and weakness in the lumbar and knee regions). It is recommended that patients with forward sperm motility of 31.34% should go to the hospital for professional diagnosis and treatment as soon as possible to avoid delaying the condition and affecting the health of the reproductive system.