That depends on how you plan to use your sperm, as well as your personal sperm quality.

Each sperm sample yields 4 vials of sperm. Generally speaking, one vial of sperm is used in each intrauterine insemination (IUI) attempt. Traditional in vitro fertilization (IVF) also uses one vial of frozen sperm per cycle. If you are considering IUI or traditional IVF, doctors recommend 3–5 vials per child you hope to have.

If you're planning on using these samples for intracytoplasmic sperm injection (ICSI), a form of IVF that involves injecting a single sperm into the egg for fertilization, one vial of sperm can be used in almost cycles — since there are typically hundreds of thousands of sperm per vial.

If you have poor semen parameters, such as low sperm count or motility, we recommend freezing multiple samples, as you may have a lower chance of pregnancy with each vial.

In general, it’s good to freeze multiple samples, especially if you know you’ll need to rely on your frozen sperm in the future or if you want a large family.

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