The analysis of your semen will allow us to estimate the number and quality of your sperm. The semen sample should be produced by masturbation only.
In general, you must ensure to have a sexual abstinence of 2 to 3 days. That means a minimum of 2 days and a maximum of 3 days without sexual activity.
But you may be asked to have a shorter abstinence period. It is essential to follow the instructions given to you in order to optimize the analysis in your specific case.