China IVF Process Explained: Complete Steps from Examination to Transfer

Opening: Real consultation scenario

"Doctor, I'm 35 years old, have been trying to conceive for two years without success, and I want to understand how IVF is actually done?" This is a question asked every week in the reproductive clinic. Many patients' understanding of IVF is limited to the words "egg retrieval and transfer," but in reality, a complete cycle includes multiple medical stages, each with its own decision-making logic and room for individualized adjustment. Below, we break down the real path of IVF in China from the perspectives of the process, timeline, age-related differences, and easily overlooked details.

A Direct answer to the question + I Actual process + J Timeline (combined presentation)

1. The Seven Core Steps of the IVF Process in China

A complete IVF cycle is divided into seven consecutive stages. From the initial examination to confirmation of pregnancy, it typically takes 2 to 3 months (excluding preliminary preparation). The specific steps and time allocation are as follows:

Stage	Core Content	Approximate Time
① Pre-treatment Examination	Female: Sex hormone panel (6 items), AMH, antral follicle count, thyroid function, infectious diseases, chromosome karyotype, etc. Male: Semen analysis, infectious diseases, chromosomes, etc.	About 1-2 months (some tests have menstrual cycle requirements)
② File Creation & Protocol Determination	Bring ID card and marriage certificate, sign informed consent; the doctor determines the ovarian stimulation protocol based on age, ovarian reserve, and medical history.	1-2 days (after all test results are available)
③ Ovarian Stimulation	Daily injections of gonadotropins, monitoring follicle development and hormone levels every 2-4 days.	10-14 days
④ Egg Retrieval + Sperm Collection	Transvaginal ultrasound-guided follicle aspiration (under intravenous sedation), male partner provides semen sample on the same day.	1 day (procedure day)
⑤ Embryo Culture	Eggs and sperm are combined in the laboratory and cultured to the cleavage stage (Day 3) or blastocyst stage (Day 5-6).	3-6 days
⑥ Embryo Transfer	The embryo is placed into the uterine cavity via the cervical canal, usually without anesthesia.	1 day (transfer day)
⑦ Luteal Phase Support + Pregnancy Test	Progesterone medications are used after transfer. A blood test for HCG is done on day 12-14 to confirm pregnancy.	14 days (medication continues until 12 weeks of pregnancy if successful)

C Doctor's perspective + B Why this problem occurs

2. Doctor's Perspective: Why the Process Cannot Be "Skipped" or "Sped Up"

IVF is not the production of standard parts on an assembly line. Each step is designed with a clear medical purpose:

• Pre-treatment Examination — The purpose is to rule out hidden factors that could affect pregnancy or increase risk. For example, carriers of balanced chromosomal translocations appear normal but may cause recurrent miscarriage or embryonic abnormalities. Proceeding directly to transfer without checking could have serious consequences.
• Individualized Ovarian Stimulation Protocol — The same ovulation induction drugs are used, but the protocol for a 35-year-old patient with polycystic ovary syndrome is completely different from that for a 40-year-old patient with diminished ovarian reserve. The doctor needs to choose the starting dose and medication type based on AMH, FSH, and antral follicle count.
• Duration of Embryo Culture — The transfer strategy differs between Day 3 cleavage-stage embryos and Day 5 blastocysts. Blastocysts are closer to the implantation window, but not all embryos can develop to the blastocyst stage. The choice depends on the number of embryos and the patient's history.

Many patients ask, "Why can't we just go straight to transfer?" or "Can we skip some tests?" From a doctor's perspective, omitting any step could increase the failure rate or risk, which is why reputable fertility centers insist on the complete process.

D Differences across age groups

3. Process Differences and Key Points by Age Group

Age	Ovarian Characteristics	Common Protocol Tendency	Items Requiring Special Attention
< 35 years	Good reserve, relatively higher number of eggs retrieved	Antagonist protocol / Long protocol	Prevention of Ovarian Hyperstimulation Syndrome (OHSS); consider blastocyst culture
35-40 years	Reserve begins to decline, aneuploidy rate in eggs increases	Antagonist protocol / Mild stimulation	Precise assessment of AMH and antral follicle count; PGT-A (if conditions permit)
> 40 years	Reserve significantly reduced, fewer eggs retrieved	Micro-stimulation / Natural cycle / Luteal phase stimulation	Embryo accumulation strategy; genetic counseling; managing expectations

Age is one of the biggest variables affecting the IVF process. Women over 40 require more intensive monitoring from the examination stage onwards, and the ovarian stimulation protocol is more focused on "accumulating embryos" rather than retrieving many eggs at once. Additionally, the increased rate of chromosomal abnormalities in embryos due to advanced age must be communicated in advance.

G Most easily overlooked details

4. Four Most Easily Overlooked Details

• Validity of Test Results — Infectious disease screenings (Hepatitis B, Syphilis, HIV, etc.) are typically valid for 6 months. Chromosome karyotype analysis is valid for life. Semen analysis is recommended to be repeated within 3 months. Before creating your file, ensure all reports are within their validity period.
• Timing of AMH Testing — AMH is not affected by the menstrual cycle but must be completed before starting ovarian stimulation. If AMH is < 1.1 ng/mL, it indicates diminished ovarian reserve, and the doctor will adjust the protocol to mild or micro-stimulation.
• Male Semen Analysis Cannot Be Skipped — Even if a man has fathered children before, semen quality can fluctuate. If semen quality is suboptimal on the day of egg retrieval, testicular sperm extraction or donor sperm may be needed. Knowing this in advance can prevent surprises on the procedure day.
• Hysteroscopy Evaluation — In cases of recurrent implantation failure or abnormal ultrasound findings of the endometrium, hysteroscopy can identify easily overlooked factors such as endometrial polyps, adhesions, or chronic endometritis.

E Brief mention of differences between countries + Combined with China's actual situation

Main Differences in Process Between China and Other Countries

In China, IVF must be performed in qualified medical institutions and requires both partners to provide ID cards and marriage certificates. Some countries allow single individuals or unmarried couples to receive assisted reproduction, but in China, legal marriage is currently a prerequisite. Additionally, China has clear restrictions on the indications for Preimplantation Genetic Testing (PGT), which is only permitted for genetic diseases, recurrent miscarriage, or advanced age, and cannot be used for sex selection or "designer babies."

Q Frequently asked questions

5. Frequently Asked Questions

N Special situation management

6. Management of Special Situations

• Can I still do IVF with very low AMH? — Yes, but the number of eggs retrieved may be low. Micro-stimulation or natural cycle protocols may be used, and it may take 2-3 cycles to accumulate embryos before transfer.
• History of recurrent miscarriage — It is recommended to add chromosome karyotype analysis for both partners, uterine cavity evaluation, and immunological tests. PGT-A may be needed to select chromosomally normal embryos.
• Hydrosalpinx (tubal fluid) — Fluid from the tube can flow back into the uterine cavity and affect embryo implantation. It is usually recommended to have the tube ligated or removed before transfer.
• Uterine fibroids or adenomyosis — Depending on the location, size of the fibroid, and its impact on the uterine cavity shape, a decision is made on whether surgical treatment is needed before starting the IVF process.

O Suitable population + P Unsuitable population (already covered in the callout above, briefly mentioned here)

Overview of Suitable Candidates

Tubal factor infertility, ovulation disorders unresponsive to ovulation induction, moderate to severe male factor, endometriosis, unexplained infertility (> 1 year), genetic diseases requiring PGT.

Overview of Unsuitable Candidates

Non-functional uterus, uncontrolled severe systemic diseases, acute infections, mental illness preventing cooperation.

R Practitioner observation (integrated into doctor's perspective)

7. Practitioner's Observation: Beyond the Process

In my years working in a fertility center, I have seen many patients take detours because of "what they read online." Some want to skip ovarian stimulation and go straight to transfer because they are afraid of injections. Some give up treatment after one failure. Others pin all their hopes on "third-generation IVF" without realizing their situation doesn't require PGT at all.

The essence of the IVF process is individualized medical decision-making. The same steps are executed with completely different details for different people. For example, on day 5 of ovarian stimulation monitoring, one person might need an increased dose, another a decreased dose, and another might need an earlier egg retrieval. These adjustments depend on the doctor's experience and the patient's cooperation, not a fixed schedule.

Another often underestimated aspect is psychological preparation. Throughout the cycle, the waiting periods for results (embryo culture, pregnancy test) are often the most煎熬. It is advisable to prepare mentally in advance and not put all the pressure on "succeeding on the first try."

Ending: Risk reminder Process reminder + Suggestions for next steps Author identity: Reproductive doctor