1. Age: an irreversible "hard indicator"
Age is the most basic and irreversible factor affecting test tubes. Women's ovarian function declines rapidly from the age of 35 and declines significantly after the age of 40.
data to speak


- Only about 20%-30% over 40 years old

Why is age so important?
- Reduced number of eggs: As you age, ovarian reserves decline and fewer and fewer eggs are available
- Reduced egg quality: Increased rate of chromosomal abnormalities in eggs leads to poor embryo quality, implantation failure, or abortion.
With an AMH value of 0.8, 12 oocytes were retrieved for the first time, only 2 embryos were developed, and the transfer failed; while Ms. Li, 28, had an AMH value of 3.2, 15 oocytes were retrieved, and 10 high-quality blastocysts were developed, which was successful once.

2. Embryo quality: the "core force" that determines success or failure
If age is the basis, then embryo quality is the core that determines success or failure. Even if you are young and have good ovaries, it will be difficult to succeed if the quality of the embryo is poor.
How to grade embryo quality?
Generally,"morphological scoring" is used to evaluate it. For example, embryos at the blastocyst stage are divided into AA, AB, BA, BB, etc., and AA level is appropriate.
Factors affecting embryo quality
- Egg quality: Older women with poor ovarian function usually have lower egg quality
- Sperm quality: Low sperm vitality, high deformity rate, and high DNA fragment rate can affect fertilization and embryo development
- Laboratory technology: The embryo culture environment and operator technology will also affect the quality of embryos.
Ten eggs were taken and 8 embryos were developed, but 6 of them were grade C (poor) and only 2 were grade B. The first transfer of a Class C embryo failed, and the second transfer of a Class B embryo successfully became pregnant.

3. The intima: the "soil" for embryo implantation
With good seeds (embryos), fertile soil (inner membrane) is needed to take root and germinate. Endometrial conditions directly affect the success rate of embryo implantation.
Ideal intimal conditions
- Thickness: 8-12mm is appropriate, too thin (<7mm) or too thick (>14mm) will affect implantation
Type B comes second, and type C is lower
- Blood flow: Good uterine blood flow can provide sufficient nutrition for the embryo.
Common endometrial problems
- Too thin intima: may be caused by multiple miscarriages, intrauterine adhesions, insufficient hormone levels, etc.
- Excessive thickness of the endometrium: may be related to endometrial hyperplasia, polyps, etc.
- Intrauterine adhesions: Can affect the contact between the embryo and the endometrium.
The quality of the embryo was very good (Grade AA), but the intima was always only 6mm, and two consecutive transplants failed. Later, through hormone conditioning + intrauterine infusion, the intima grew to 9 mm, and the third transplant was successful.

4. Which of the three is most important?
In fact, these three are complementary and indispensable
1. Age is the basis: Even if the endometrium of young women is slightly worse, as long as the embryo quality is good, the success rate is still high
2. Embryo quality is the core: without a good embryo, no matter how good the intima is, it is useless
3. The endometrium is the guarantee: with a good embryo, a good endometrium is needed to successfully implant.
Summarize priorities
- Young women: embryo quality> endometrium> age
- Elderly women: age (egg quality)> embryo quality> endometrium.

5. Suggestions for test tube sisters
1. Action early: Don't wait until you are old to start, being young is a big advantage
2. Pay attention to pre-pregnancy conditioning: Both couples should condition their bodies 3-6 months in advance to improve the quality of eggs and sperm
3. Choose a regular hospital: Laboratory technology and doctor experience are crucial for embryo culture
4. Maintain a good attitude: Anxiety affects endocrine and reduces success rates.
conclusion
The success rate of test tube is not determined by a single factor, but is the result of the combined action of age, embryo quality, and endometrial conditions. Instead of worrying about which is more important, it is better to prepare from now on: young sisters seize the time, older sisters actively recuperate, and everyone can find their own path to pregnancy.