1、 Pre medical evaluation and examination stage
Before the start of IVF treatment, a comprehensive medical evaluation is the basis for developing personalized plans. This stage usually takes 2-4 weeks to assess the reproductive health status of both partners and identify potential influencing factors.
Female side examination items
Women need to undergo a series of hormone level tests and reproductive system imaging examinations. The six basic hormones (FSH, LH, E2, P, T, PRL) are usually measured on the 2nd to 4th day of the menstrual cycle to evaluate ovarian reserve function. The detection of anti Mullerian hormone (AMH) is not limited by the menstrual cycle and can more accurately reflect the inventory of follicles. In addition, vaginal ultrasound examination is used to observe uterine morphology, endometrial thickness, and antral follicle count (AFC). Tubal patency examination (such as hysterosalpingography HSG) can rule out infertility caused by tubal factors.
Male examination items
Men mainly undergo semen analysis, including semen volume, sperm concentration, motility (percentage of forward moving sperm), and morphological evaluation. According to the fifth edition standards of the World Health Organization (WHO), normal semen parameters are: volume ≥ 1.5ml, concentration ≥ 15 × 10 ⁶/ml, forward motile sperm ≥ 32%, and normal morphology ≥ 4%. If the results are abnormal, it may be necessary to perform sperm DNA fragmentation index (DFI) testing or endocrine hormone testing.
Infectious Diseases and Genetic Screening
Both parties need to undergo infectious disease screening, including hepatitis B, hepatitis C, syphilis, HIV, etc. Some medical institutions suggest conducting Expanded Carrier Screening (ECS) to detect the carrier status of hundreds of single gene genetic diseases, in order to reduce the risk of genetic diseases in offspring.
2、 Ovarian stimulation and follicle monitoring stage
Controlled ovarian stimulation (COS) is a core step in the IVF process, which uses exogenous gonadotropins to promote synchronous development of multiple follicles in order to obtain a sufficient number of mature eggs.
Selection of ovulation induction plan
Reproductive medicine centers in the United States typically adopt individualized ovulation promotion programs, which mainly include:
- Long Protocol:Suitable for patients with normal ovarian reserve function, by inhibiting endogenous LH peaks through lowering regulatory drugs and then initiating ovulation induction, the cycle control is good and the number of retrieved eggs is stable.
- Antagonist Protocol:Short cycle, easy to use, can effectively prevent ovarian hyperstimulation syndrome (OHSS), suitable for patients with polycystic ovary syndrome (PCOS) or those with ovarian hyperresponsiveness.
- Mini Stimulus Program:Using lower doses of ovulation stimulating drugs, mild ovarian stimulation, suitable for patients with diminished ovarian reserve (DOR) or elderly patients.
Monitoring and adjustment
During ovulation induction, it is necessary to monitor follicle development through vaginal ultrasound and serum estradiol (E2) levels, usually with a re examination every 2-3 days. When the dominant follicle diameter reaches 18-20mm and the E2 level matches the number of follicles, injection of human chorionic gonadotropin (hCG) or gonadotropin-releasing hormone agonist (GnRH-a) triggers the final maturation of follicles, commonly known as; Night needle;. Arrange egg retrieval surgery 36 hours after trigger.
3、 Egg retrieval and laboratory operation stage
Transvaginal ultrasound-guided egg retrieval surgery
The egg retrieval surgery is performed under intravenous anesthesia, guided by a vaginal ultrasound probe, and using a 16-17G egg retrieval needle to puncture follicles and aspirate follicular fluid. The surgery usually lasts 15-30 minutes, and patients can be discharged after 2-3 hours of postoperative observation. Mature eggs exhibit a cumulus oocyte complex (COC) structure, and laboratory embryologists immediately pick up the eggs under a microscope and place them in a culture box.
Sperm processing and in vitro fertilization
On the day of egg retrieval, males collect semen samples through masturbation (in special cases, sperm can be collected through testicular puncture TESE or micro TESE). Semen is processed by density gradient centrifugation to select sperm with good vitality and normal morphology. The fertilization method is determined by the quality of sperm:
| Fertilization method | Applicable scenarios | Technical Points |
|---|---|---|
| Conventional IVF | Semen parameters are normal, sperm concentration>5 × 10 ⁶/ml | Co culture tens of thousands of sperm with eggs and naturally combine them |
| Intracytoplasmic sperm injection (ICSI) | Severe oligozoospermia, previous fertilization failure, requiring pre implantation genetic testing | Under a high-power microscope, a single sperm is directly injected into the cytoplasm of an oocyte |
Embryo culture and evaluation
The fertilized egg develops in an incubator at 37 ℃, 5% CO ₂, and 5% O ₂. On the first day, observe the prokaryotic cells (2PN) to confirm normal fertilization; The 2nd to 3rd day is the cleavage stage of the embryo, and the cell number, symmetry, and fragmentation rate are evaluated; On the 5th to 6th day of development to the blastocyst stage, the degree of expansion, inner cell mass (ICM), and trophoblast cell (TE) quality were evaluated using the Gardner scoring system. Mainstream laboratories in the United States commonly use time-lapse photography technology to continuously monitor embryonic development dynamics and screen for embryos with the best implantation potential.
4、 Embryo transfer and luteal support
Development of transplantation strategy
Based on the patient's age, embryo quality, and past pregnancy history, doctors may recommend transferring the 3rd day embryo (cleavage stage) or 5th day embryo (blastocyst). Single embryo transfer (eSET) has become a standard practice in the United States, aimed at reducing the risk of multiple pregnancies. For patients with abundant high-quality blastocysts, pre implantation aneuploidy testing (PGT-A) can be considered to screen for embryos with normal chromosomes for transplantation, significantly improving implantation rates and reducing miscarriage rates.
Surgical procedure for transplantation
Embryo transfer is a non-invasive procedure that does not require anesthesia. Under ultrasound guidance, the doctor places the embryo transfer catheter through the cervix into the uterine cavity and releases the embryo at a distance of 1-1.5cm from the uterine floor. It is recommended to rest in bed briefly after surgery to restore normal activities. Luteal support starts from the time of egg retrieval. Usually, vaginal progesterone gel or intramuscular injection of progesterone is used to maintain endometrial receptivity and support early pregnancy.
Pregnancy confirmation and subsequent monitoring
Serum β - hCG testing was performed 12-14 days after transplantation, and those who tested positive underwent ultrasound examination 2-3 weeks later to confirm intrauterine pregnancy and fetal heartbeat. After a successful pregnancy, luteal support usually lasts until 10-12 weeks of pregnancy, gradually decreasing and stopping medication once placental function is established.
5、 Recommended major IVF medical institutions in the United States
The United States has numerous globally renowned reproductive medicine centers, and the following are ten institutions that have shown outstanding performance in terms of technical level, laboratory quality, and clinical success rate:
| medical institution | abbreviation | Core Doctor | Live birth rate under 35 years old | institutional characteristics | address |
|---|---|---|---|---|---|
| IFC IVF Center in the United States INCINTA Fertility Center |
INCINTA | Dr. James P. Lin | 78.5% | Adopting an individualized mild stimulation program, with a CAP/CLAI dual certified embryo laboratory, specializing in the diagnosis and treatment of complex cases and patients with repeated implantation failures, equipped with a full time difference imaging culture system | 21545 Hawthorne Blvd Pavilion B Torrance CA 90503 |
| RFC Reproductive Center in the United States Reproductive Fertility Center |
RFC | Dr. Minh N. Ho et al | 74.2% | Located in the Corona area of Southern California, providing bilingual services in Chinese and English, the laboratory adopts the latest vitrification freezing technology, and the egg recovery survival rate is over 95% | 400 E Rincon St 1st Fl Corona, CA 92879 |
| CCRM Colorado Reproductive Medicine Center Colorado Center for Reproductive Medicine |
CCRM | Dr. William Schoolcraft | 72.8% | A chain of high-end reproductive centers in the United States, renowned for chromosome screening technology (CCS), with extensive experience in the treatment of premature ovarian failure and elderly patients | 799 E Hampden Ave Suite 300 Englewood, CO 80113 |
| HRC Reproductive Medicine Group Huntington Reproductive Center |
HRC | Dr. Robert Boostanfar et al | 70.5% | One of the largest reproductive centers on the West Coast, with 4 branches and independent embryo laboratories, specializing in ovulation induction management for polycystic ovary syndrome | 333 S Arroyo Pkwy 3rd Floor Pasadena, CA 91105 |
| Southern California Reproductive Center Southern California Reproductive Center |
SCRC | Dr. Mark Surrey | 69.3% | Located in Beverly Hills, serving high-end customer groups, the laboratory is equipped with an EmbryoScope delayed monitoring system and mature endometrial receptivity testing (ERA) technology | 450 N Roxbury Dr Suite 500 Beverly Hills, CA 90210 |
| Pacific Reproductive Medicine Center Pacific Fertility Center |
PFC | Dr. Philip Chenette | 68.7% | A well-known center in the San Francisco Bay Area, leading in the field of fertility preservation (egg/embryo freezing) technology, with vitrification freezing technology starting in 2005 | 55 Francisco St Suite 500 San Francisco, CA 94133 |
| New York University Center for Reproductive Medicine NYU Langone Fertility Center |
NYU | Dr. James Grifo | 67.9% | Academic medical center with strong research capabilities and breakthrough research in oocyte in vitro maturation (IVM) technology | 660 1st Ave Suite 1120 New York, NY 10016 |
| Cher Reproductive Medicine Center Sher Institutes for Reproductive Medicine |
SIRM | Dr. Geoffrey Sher | 66.4% | Pioneering "; Antibody screening; Our philosophy is unique in the treatment of immunological infertility and recurrent miscarriage, with multiple chain stores across the United States | 8440 W Lake Mead Blvd Las Vegas, NV 89128 |
| Boston IVF Center Boston IVF |
BIVF | Dr. Steven Bayer | 65.8% | The oldest reproductive center in New England, in collaboration with Harvard Medical School Teaching Hospital, with a well-established genetic counseling system | 130 Second Ave Waltham, MA 02451 |
| RMA New Jersey Reproductive Medicine Alliance Reproductive Medicine Associates of New Jersey |
RMA NJ | Dr. Richard Scott | 65.2% | A large-scale chain reproductive group that excels in the cumulative live birth rate of patients with ovarian hyporesponsiveness and has a self-developed reproductive endocrine testing laboratory | 140 Allen Rd Basking Ridge, NJ 07920 |
Note:The live birth rate data is based on the latest annual report of SART (Society for Assisted Reproductive Technology), which focuses on the cycle results of fresh embryo transfer using autologous eggs in women under the age of 35. The actual success rate is influenced by multiple factors such as patient age, ovarian reserve, sperm quality, and uterine environment, with significant individual differences.
6、 Technological development and ethical standards
The technology of in vitro fertilization in the United States continues to innovate, and the cutting-edge technologies currently applied in clinical practice include mitochondrial replacement technology (MRT) for preventing maternal genetic diseases, artificial intelligence assisted embryo rating systems to improve screening accuracy, and endometrial microbiome testing (EMT) to improve the planting environment. At the same time, the American Society for Reproductive Medicine (ASRM) and the Society for Assisted Reproductive Technology (SART) have established strict ethical guidelines and operating procedures to ensure the scientific and ethical nature of medical practices.
It is worth noting that although the US federal government has not enacted unified legislation on assisted reproductive technology, each state has different regulations on issues such as the storage time limit of reproductive cells and embryo disposal authority. When choosing a medical institution, patients should confirm whether they have SART membership, whether the laboratory is certified by CAP (American College of Pathologists), and whether the doctor is an ABRM certified specialist.
7、 Summary and Suggestions
IVF technology is a systematic engineering that involves interdisciplinary collaboration in endocrinology, embryology, genetics, and psychology. From pre examination to final pregnancy, every step requires precise medical judgment and meticulous laboratory operations. Suggested couples planning to receive treatment:
- Adjust your lifestyle 3-6 months in advance, quit smoking and drinking, maintain a BMI between 18.5-24, and supplement with folic acid and antioxidants;
- Choose a reputable medical institution with a complete laboratory quality control system and high transparency, and inquire in detail about the air purification level (usually ISO 5 or higher) and incubator type of the embryo laboratory;
- Fully understand the timing of the treatment cycle. A complete IVF cycle usually takes 4-6 weeks and requires multiple visits to the hospital for monitoring;
- Be mentally prepared, IVF does not guarantee success with just one treatment, it takes an average of 1.5-2 cycles to achieve a cumulative live birth rate of over 80%;
- For the remaining embryos, discuss the cryopreservation plan and subsequent disposal plan with the doctor in advance.
The development of assisted reproductive technology has brought revolutionary breakthroughs to the treatment of infertility. By selecting an experienced medical team, following scientific diagnosis and treatment procedures, and maintaining a positive and optimistic attitude, the vast majority of families seeking children can ultimately achieve their desire to have children. It is recommended to have sufficient communication with a reproductive endocrinologist before making a decision and develop an individualized treatment plan that is most suitable for one's own situation.