Restrictions on IVF
IVF technology is an assisted reproductive technology, which helps couples who cannot conceive naturally to achieve fertility through in vitro fertilization and embryo transfer. However, in order to protect infants and ensure the moral and legal compliance of the whole process, IVF is subject to some restrictions in many countries. Next, we will elaborate on the four limitations of IVF.

Age limit
IVF technology usually has certain restrictions on the age of women. Too old or too young may affect women's risk of pregnancy and childbirth. In many countries, women must be at least 18 years old to carry out IVF, which is to ensure that they have sufficient fertility and psychological maturity. In addition, for women over 35 years old, the IVF program may face more risks and challenges, because aging will lead to egg quality decline and other potential health problems.
In addition, IVF technology also has certain restrictions on the age of men. The quality and quantity of men's sperm will also decline with age, so some hospitals may limit the age of men to improve the success rate and children's health.
Physical health
IVF requires a series of medical tests and evaluations to ensure that the health of couples is suitable for this technology. Women need to undergo gynecological examination, blood and urine examination to exclude any disease or health problem that may affect pregnancy and pregnancy. Men need sperm analysis to assess the quality of their sperm.
In addition, both the couple need to carry out quasisex chromosome karyotype analysis to exclude any hereditary diseases and chromosome abnormalities. This is to reduce the birth risk of offspring suffering from serious genetic diseases.
Restrictions on the source of sperm and eggs
IVF technology also limits the source of sperm and eggs. Usually, couples use their own sperm and eggs for in vitro fertilization and embryo transfer. However, some hospitals or regions may limit the use of eggs by older women, because egg quality will decline with age.
In some special cases, if the couple's sperm or eggs have genetic diseases or inappropriate quality, they can choose to use donated sperm or eggs. However, the use of donated sperm or eggs will cause a series of ethical and legal problems, so it is subject to strict regulations and restrictions.
Psychological and ethical requirements
The IVF process is a physical and mental challenge for couples. Therefore, in some countries, there are psychological and ethical requirements to ensure that couples have psychological and emotional preparation. Couples may need to undergo a psychological assessment to ensure that they understand and accept the risks and uncertainties of IVF. Hospitals and professionals need to assess the marital stability, legal knowledge and important decision-making ability of couples to ensure that they make wise choices.
In conclusion, IVF technology is subject to a series of restrictions to ensure the safety and well-being of infants and couples. Age limit, physical health condition, source limit of sperm and eggs, and psychological and ethical requirements are important constraints. Compliance with these regulations can reduce risks and improve the success rate of IVF.