What is the normal sperm survival rate for boys?

Male fertility is directly proportional to the number of sperm and sperm motility, and inversely proportional to the number of sperm abnormalities; if the semen test results show that the semen is 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 is less than Ⅱ, it will have a direct impact on pregnancy. [1]

Sperm survival rate pathological factors

(1) Sexual life:

Sexual intercourse can reflexively cause the contraction of the vagina and uterus, accelerating the movement of 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 confirmed that repeated mating stimulation can greatly accelerate the movement of sperm and increase the fertilization rate.

(2) Estrogen:

Estrogen can increase the contraction activity of the bilateral fallopian tubes. In the early and ovulation period, when estrogen is dominant, the bilateral fallopian tube muscle wall secretes more, and the bilateral fallopian tubes move from the proximal to the distal end in a segmented manner, promoting the migration of male sperm and bilateral fallopian tube fluid from the uterus to the ovary. Estrogen can also affect the operation of male sperm by affecting the characteristics of the cervix and fluid.

(3) Prostacyclin:

There are various prostacyclins in the semen and female reproductive system, which have a contractile effect on the uterus and bilateral fallopian tubes of non-pregnant women. In addition, estrogen can enhance this effect. The sensitivity of the uterus to prostacyclins is higher in the middle and late stages of the menstrual cycle.

(4) Cervical mucus:

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

(5) Influence of spermatogenesis. Male sperm is often controlled by a certain spermatogenesis system. If any part of the spermatogenesis system is abnormal, it will cause an imbalance in spermatogenesis and result 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 movement and speed of male sperm in the bilateral fallopian tubes are controlled by several systems: the peristaltic direction of the bilateral fallopian tube muscle layer; the contraction of the bilateral fallopian tube mucosa and the bilateral fallopian tube mesentery; the flow direction of the microvilli activity; the opening and closing of a part of the bilateral fallopian tube to the outside. Because the contraction of the bilateral fallopian tubes can temporarily change the appearance of the bilateral fallopian tube cavities, the liquid and suspended male sperm can move from one cavity to another and gradually move to the umbrella end of the bilateral fallopian tubes.

Sperm survival rate daily life elements

1. Exhaust emissions and noise

With the development trend of intelligence, the impact of urban noise on physical and mental health is more prominent. Noise can disrupt the body's endocrine system and cause abnormalities in sperm and sperm. Long-term noise pollution can cause male infertility; for women, it can cause miscarriage and malformed fetuses. Exhaust emissions contain many harmful substances, such as sulfur dioxide and carbon dioxide. Long-term exposure to these substances will affect reproductive health. The most serious is that dioxins in exhaust emissions are very strong environmental endocrine-influencing substances, which can change the shape of men's testicles, reduce sperm density, and reduce spermatogenesis.

2. Alcohol and tobacco

Smoking has always been a major health hazard, and its impact on semen is equally significant. The tar and polycyclic aromatic hydrocarbons produced in cigarettes can cause testicular atrophy and changes in sperm morphology. Compared with non-smokers, smokers have significantly reduced various key indicators of semen quality, and the abnormality rate of sperm has increased. The total white blood cell count in semen has increased. Alcohol has a direct effect 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.