Post Date December, 03 2023
Many friends are not very clear about the in vitro survival time of sperm. Generally speaking, the survival time of sperm in different external environments is not the same. The in vitro survival time of sperm is generally 4-8 hours or more in a 37 ℃ environment. Below is a detailed introduction.
How long does sperm survive in vitro? The in vitro survival time of sperm varies from person to person
The survival time of sperm in vitro actually varies from person to person and is also related to the external environment. Sperm can survive for about 24 hours in the semen after ejaculation, and if the temperature is lowered, the semen can also be stored for a few weeks. The following is the survival time of sperm in different environments:
1. Survival time of active sperm in a 37 ℃ environment: 4-8 hours or more;
2. Survival time of active sperm in the vagina: 0.5 days;
3. The survival time of active sperm in the cervix: 2-8 days;
4. The survival time of active sperm in the uterus and fallopian tubes: 2-2.5 days.
5. If the temperature is lowered, the survival time of sperm can reach several weeks; If frozen with liquid nitrogen, sperm can survive longer and even be preserved for a long time.
How long does sperm survive in vitro? The fertilization ability of sperm only lasts for 20 hours
When sperm rush up to reach the uterine cavity, their quantity is only 1-5% of that during ejaculation. Why is this? Because the sperm retained in the semen during ejaculation can be protected by a large amount of fructose and enzymes that break down sugars in the semen. When the sperm enters the uterine cavity, they leave the semen, and their living conditions are far inferior to those in the semen. Therefore, their lifespan is greatly shortened. Poor quality sperm run slower and cannot reach the uterine cavity quickly, resulting in a loss of vitality. After passing through various levels, there are very few sperm left that can finally reach the fertilized site of the fallopian tubes.
However, as long as sperm enter the fallopian tube, they have strong fertilization ability. Of course, only 1-2 sperm were fortunate enough to combine with the egg, while the remaining sperm died within 24-36 hours. Only sperm stored in the crypt of the cervical mucosa can have a lifespan of 2-6 days. However, their fertilization ability has been basically lost, as most sperm can only maintain fertilization for about 20 hours.
(Intern Editor: Cai Junyi)
