What is the normal sperm survival rate for boys?

A man's fertility is directly proportional to the sperm count and sperm motility, and inversely proportional to the number of sperm abnormalities; if the semen test results are less than 2 ml, the sperm count is less than 60 million/ml, or the normal sperm morphology is less than 60%, the sperm survival rate is less than 60%, and the sperm motility II or below will have a direct impact on pregnancy. [1]

Sperm viability disease factors

(1) Sex life:

Sexual intercourse can reflexively cause the contraction of the vagina and uterus, speeding up the operation of male sperm. Sexual medicine research has confirmed that the vagina contracts regularly during female orgasm, and the uterus is also in a state of contraction. Clinical experiments have proven that repeated mating stimulation can greatly speed up the operation of male sperm and increase the fertilization rate.

(2) Estrogen:

Estrogen can increase the contraction activity of both fallopian tubes. In the early ovulation period and during ovulation, when estrogen is dominant, there is a lot of secretion from the muscle walls of both fallopian tubes. The peristalsis of both fallopian tubes from the proximal end to the distal side promotes male sperm and bilateral fallopian tube fluid to migrate step by step from the side of the uterus to the side of the uterus and ovary. Estrogen can also affect the function of male sperm by affecting the properties of the cervix and fluid.

(3) Prostacyclin:

Various prostacyclins are contained in the sperm and female reproductive system, and they have a contraction effect on the unpregnant uterus and both fallopian tubes. In addition, estrogen can enhance this effect. The sensitivity of the uterus to prostacyclin is higher during the middle and late menstrual periods.

(4) Cervical mucus:

As a storage area for sperm, cervical mucus can protect sperm from the adverse effects of the vaginal environment, provide kinetic energy for sperm, and may participate in sperm capacitation.

(5) The influence of sperm production. Men often find that male sperm is controlled by a certain sperm production system. If any part of the male sperm production system is abnormal, it will cause an imbalance in the male sperm production function, resulting in a low sperm survival rate.

(6) Others:

During sexual intercourse, semen is ejaculated around the cervix and the posterior fornix of the vagina. The operation method and speed of male sperm in the bilateral fallopian tubes are controlled by several mechanisms: the direction of peristalsis in the muscle layer of the bilateral fallopian tubes.； Retraction of bilateral fallopian tube mucosa and bilateral fallopian tube mesosa ； Flow direction of microvilli activity ； The opening and closing of part of the fallopian tubes on both sides. Because the contraction of the bilateral fallopian tubes can temporarily change the shape of the bilateral fallopian tube lumen, the liquid and suspended sperm can move from one lumen to the other, and gradually move to the fimbriae of the bilateral fallopian tubes.

Sperm survival rate daily life elements

1. Exhaust gas emissions and noise

With the development trend of intelligence, the impact of noise in big cities on physical and mental health has become more prominent. Noise can disrupt the body's endocrine system and cause sperm and male sperm abnormalities. Long-term noise pollution can cause male infertility ； For women, it can cause miscarriage and malformed fetuses. Tail gas emissions contain many harmful substances, such as sulfur dioxide, carbon dioxide, etc. Long-term exposure of the body to this substance can affect reproductive health. The most serious thing is that dioxin in exhaust emissions is a strong environmental endocrine-influencing substance, which can change the shape of men's testicles, reduce sperm density, and reduce sperm production ability.

2. Alcohol and tobacco

Smoking has always been a serious problem for physical and mental health, and its impact on spermatozoa is equally significant. Tar and polycyclic aromatic hydrocarbons produced in cigarettes can cause testicular atrophy and changes in sperm morphology. Comparing smokers and non-smokers, various key indicators of semen quality were significantly reduced, and the rate of male sperm abnormalities increased. The white blood cell count in semen increases. Ethanol has a direct impact on the human liver and male testicles. Studies have found that patients with chronic alcoholism will experience testicular atrophy, resulting in reduced semen quality. Therefore, men must avoid habitual excessive drinking.