生殖地圖What is the difference between first, second, and third generation IVF? How to choose?
The colloquial terms 'first, second, and third generation IVF' correspond to three different techniques: first generation is conventional in vitro fertilization (IVF, where eggs and sperm are placed in the same culture dish for natural fertilization), second generation is intracytoplasmic sperm injection (ICSI, where a single sperm is directly injected into an egg by an embryologist), and third generation is preimplantation genetic testing (PGT, which screens embryos for chromosomal or genetic abnormalities before transfer). These are not progressive generations where newer is always better; rather, they address different causes of infertility, and the choice is made by a reproductive medicine specialist based on the couple's condition. The following is a neutral compilation of information and does not constitute medical advice.
FAQ
What is first generation IVF (IVF)? What conditions is it suitable for?
First generation refers to conventional IVF, where retrieved eggs and processed sperm are placed in the same culture dish, allowing sperm to fertilize the egg naturally, closely mimicking natural fertilization. It is commonly used for female factor infertility, such as blocked or damaged fallopian tubes, ovulation disorders, and when sperm quality is within normal range. Actual suitability is determined by the physician.
What is the difference between second generation IVF (ICSI) and first generation?
Second generation is intracytoplasmic sperm injection (ICSI), where an embryologist selects a morphologically and motile sperm under a microscope and directly injects it into the egg to achieve fertilization. It is primarily used for male factor infertility (low sperm count, poor motility or morphology) or previous poor fertilization. Neutral information: In cases without severe male factor, ICSI does not necessarily improve live birth rates compared to conventional IVF; the decision is made by the physician on a case-by-case basis.
What is third generation IVF (PGT)?
Third generation refers to preimplantation genetic testing (PGT), where a small number of cells are biopsied from embryos before transfer to analyze and select embryos with normal chromosomes or genes. Common types include PGT-A (aneuploidy screening), PGT-M (monogenic disease testing), and PGT-SR (structural rearrangement testing). Suitability and testing type are assessed by the physician based on medical history and genetic risk.
Which generation (first, second, or third) is more suitable for me?
There is no hierarchy of superiority among the three; they target different causes of infertility: female factors often use first generation, male factors often use second generation, and for those at risk of chromosomal or genetic disorders, the physician may recommend third generation. The actual choice requires evaluation by a reproductive medicine specialist based on medical history, semen analysis, ovarian function, etc. This page provides neutral information.
Is there a 'fourth generation IVF'?
Colloquially, 'fourth generation' sometimes refers to techniques such as ooplasmic transfer or mitochondrial (spindle) transfer, which are mostly in research or experimental stages and are not approved as routine clinical assisted reproductive procedures in Taiwan. Legal implementation is subject to the latest regulations and announcements from the Ministry of Health and Welfare.
Is third generation IVF (PGT) necessary?
Not everyone needs it. PGT is an optional embryo testing procedure; physicians typically recommend it in cases of advanced maternal age, recurrent miscarriage, repeated implantation failure, or known risk of chromosomal/monogenic diseases. Whether to perform it and which type is decided after discussion between the physician and the couple. This page does not constitute medical advice.
Does the choice of generation relate to cost or government subsidies?
The choice of technique depends on medical need, not price. Different techniques and whether PGT is performed affect overall costs; subsidies follow government program regulations. For neutral information on costs and subsidies, please refer to the pages 'How are IVF costs calculated?' and 'How to apply for government IVF subsidies?' on this site.
How do I know which IVF technique is suitable for me?
You need to undergo evaluation by a reproductive medicine specialist, which typically includes medical history, semen analysis, ovarian function tests (e.g., AMH, ultrasound), etc. Based on the cause of infertility, the physician decides whether to use conventional fertilization or ICSI, and whether to add embryo genetic testing. This page provides neutral information and cannot replace individual diagnosis and advice from a physician.
References (official data sources)
· This page is a neutral compilation of information, for reference only, not medical advice, and does not constitute any treatment commitment. Actual regulations and treatments should be based on announcements from competent authorities and explanations from qualified physicians.
