How long can sperm survive outside the body

Some men with difficulty in sperm extraction, or men with azoospermia or severe oligospermia or weak sperm, once sperm are found after sperm extraction, the doctor will recommend sperm freezing. Why freeze sperm immediately? How long can sperm survive outside the body without freezing? If females take eggs and males take sperm at the same time, will the sperm waiting time affect the sperm vitality? This is also a question that many people want to know. Let’s take a look at it today.

Generally speaking, the sperm survival time is different in different external environments. Different temperatures and different environments will affect the sperm survival time.

In the environment of 37 degrees Celsius, the survival time of mobile sperm is more than 4 to 8 hours.

In the vagina, mobile sperm survival time is 0.5 days.

In the cervix, mobile sperm survival time is 2 to 8 days.

In the uterus and fallopian tubes, the survival time of active sperm is 2 to 2.5 days.

If the temperature is lowered, the sperm survival time will increase correspondingly. If liquid nitrogen is used for cryopreservation, the sperm can even be stored for a long time.

Without special treatment, the sperm fertilization ability can only be maintained for 20 hours.

A large amount of fructose and sugar-decomposing enzymes in the semen can provide protection for the sperm. When the sperm leaves the semen, the living conditions become lower, the life span is greatly shortened, and the poor quality and slower-running sperm have lost vitality before reaching the uterine cavity. Sperm enters the fallopian tube and can survive for 24 to 36 hours. If fertilization cannot be completed during this time, the sperm will die one after another. Some sperm will survive in the crypt of the cervical mucosa for 2 to 6 days, but the fertilization ability of the sperm is only about 20 hours, so these sperm can not complete fertilization.

Because of this reason, for some men with poor sperm motility, after checking the woman's normal body and smooth fallopian tubes, the sperm will be directly delivered to the female body by artificial insemination to ensure that a large amount of sperm can directly reach the uterine cavity, increasing Conception rate.

Some men with particularly poor sperm quality, or those with a particularly small number of sperm, or couples with certain problems with the fallopian tube will generally accept IVF. Remove sperm and eggs from the body, fertilize them into embryos, and then implant them back into the female uterus. This avoids the small number of spermatozoa who are all killed before encountering the egg; or because of female reasons, they cannot be encountered at all. The egg cannot be conceived.