The only way to find out if your sperm is fertile accurately is by means of a semen analysis or seminogram. You can ask your doctor to have your fertility checked whenever you want, although men normally visit a fertility specialist if they have not managed to conceive after one year having unprotected intercourse.
How can you tell if your sperm is fertile?
By Sara Salgado B.Sc., M.Sc. (embryologist).
Last Update: 10/26/2017
Degree in Biochemistry and Molecular Biology from the University of the Basque Country (UPV/EHU). Master's Degree in Human Assisted Reproduction from the Complutense University of Madrid (UCM). Certificate of University Expert in Genetic Diagnosis Techniques from the University of Valencia (UV).