If you are wondering how IVF is done step by step, the short version is this: fertility drugs grow multiple eggs, those eggs are retrieved under sedation and fertilized in a lab, the resulting embryos grow 3-6 days, and the best one is transferred into the uterus. From the first injection to the pregnancy test, one complete cycle takes about 4 to 6 weeks.
About 2-3% of all babies born in the United States each year were conceived through IVF, according to the CDC’s ART surveillance report.
“Assisted Reproductive Technology (ART) is a term that describes a group of methods used to help people who have problems conceiving become pregnant through the handling of eggs and sperm. The most common type of ART is in vitro fertilization (IVF).” — US Centers for Disease Control and Prevention (CDC), ART program documentation, 2023
Below is every step — what happens, how long it takes, and what it feels like.
Step 1: How Does Ovarian Stimulation Work?
In a natural cycle a woman matures one egg; IVF needs many, so you inject hormone medication daily for 8 to 14 days to grow all recruitable follicles at once.
Which Medications Are Used?
| Medication | Type | Purpose |
|---|---|---|
| FSH (Gonal-F, Follistim, Puregon) | Follicle-stimulating hormone | Drives follicle growth |
| LH / Menopur | Luteinizing hormone + FSH | Supports follicle development |
| GnRH antagonist (Cetrotide, Ganirelix) | Prevents early ovulation | Stops eggs releasing too soon |
| hCG or GnRH agonist (trigger shot) | Final maturation | Completes egg maturation 36 hours before retrieval |
Monitoring and What It Feels Like
You visit the clinic every 1-3 days for a transvaginal ultrasound (follicle target: 15-25 mm) and a blood test for estradiol (E2).
Most women average 8 to 15 mature follicles per cycle, and the doctor adjusts doses based on your response. Expect mild bloating and lower-abdominal fullness in week two, injection-site soreness, and hormone-related fatigue — but most women keep working normally throughout.
Step 2: What Happens at the Trigger Shot?
When at least 2-3 follicles reach 17-20 mm and estrogen levels are right, you give a trigger injection — usually hCG (Novarel, Pregnyl) or a GnRH agonist (Lupron). Timing must be precise: retrieval is scheduled 34-36 hours later, because injecting too early or too late means eggs may be immature or already released.
Step 3: How Is the Egg Retrieval Performed?
Retrieval is a 30-minute outpatient procedure under light sedation or general anesthesia, so you feel nothing while it happens.
- An ultrasound probe with a needle guide is placed in the vagina
- A thin needle passes through the vaginal wall into each follicle
- Follicular fluid is suctioned out
- The embryologist identifies the eggs in the fluid immediately
Is the Procedure Painful, and How Do You Recover?
The procedure takes 20-30 minutes; you wake in recovery and go home 1-2 hours later. Rest for the day — mild cramping and light spotting are normal, avoid driving, heavy lifting, and sex for 24-48 hours, and resume normal activity the next day.
How Many Eggs Are Retrieved?
The average yield is 8-15 eggs, varying widely by age and ovarian reserve:
| Age group | Average eggs retrieved |
|---|---|
| Under 35 | 10 - 16 |
| 35-37 | 8 - 14 |
| 38-40 | 5 - 10 |
| Over 40 | 3 - 7 |
Step 4: How Do Eggs Get Fertilized in the Lab?
On retrieval day (Day 0), the embryologist combines your eggs with sperm — using one of two methods depending on the semen sample.
| Method | How it works | When it is used |
|---|---|---|
| Conventional IVF | Sperm and egg are placed together in a dish and fertilization happens naturally | Normal sperm parameters |
| ICSI (intracytoplasmic sperm injection) | A single sperm is injected directly into each mature egg | Low count, poor motility, prior fertilization failure, or frozen sperm |
About 70-80% of mature eggs fertilize successfully and become embryos.
Step 5: How Do Embryos Grow Over Days 1-6?
Fertilized eggs — now embryos — develop in specialized incubators that mimic the fallopian tube environment.
| Day | Stage | Key event |
|---|---|---|
| Day 1 | Pronuclear stage | Fertilization confirmed (two pronuclei visible) |
| Day 2-3 | Cleavage stage | 4-8 cell embryo; transfer sometimes done here |
| Day 5-6 | Blastocyst stage | 100-200 cells; preferred stage for transfer and biopsy |
Embryologists grade each embryo daily on cell number, symmetry, and fragmentation, and only the highest-grade embryos are chosen for transfer or freezing.
Why Do Most Clinics Prefer Blastocyst Transfer?
Clinics now aim for Day 5/6 blastocyst transfer because implantation per embryo is higher, selection of viable embryos is better, and transferring a single blastocyst lowers multiple-pregnancy risk. If you have very few embryos, a Day-3 transfer may still be recommended.
Step 6: Should You Add Genetic Testing, or PGT?
If you opt for PGT, the embryologist biopsies a few trophectoderm cells from each blastocyst on Day 5 or 6, then freezes the embryos while the sample is sent to the lab.
| Test | What it screens for |
|---|---|
| PGT-A | Normal chromosome number (aneuploidy) |
| PGT-M | Single-gene disorders (e.g., cystic fibrosis, BRCA mutations) |
| PGT-SR | Chromosomal structural rearrangements |
Results take 7-14 days, and only euploid (chromosomally normal) embryos are recommended for transfer. The ASRM Practice Committee notes that PGT-A lowers miscarriage rates but does not guarantee a live birth and requires a freeze-all cycle — see our PGT genetic screening guide.
Step 7: How Is the Embryo Transfer Done?
Transfer takes about 15 minutes and needs no anesthesia — most women compare it to a routine Pap smear.
| Transfer type | Timing | When it applies |
|---|---|---|
| Fresh transfer | Day 3, 5, or 6 of the same cycle | No PGT, good lining, no OHSS risk |
| Frozen transfer (FET) | 1-2 months later | After PGT, or when the uterus needs recovery time |
What Happens During the Procedure?
- You arrive with a comfortably full bladder (it sharpens the ultrasound view)
- A speculum is placed
- The doctor loads the embryo into a thin soft catheter
- Under ultrasound guidance the catheter passes through the cervix and the embryo is gently released
- You lie back for 15-20 minutes, then resume normal activity (see our embryo transfer aftercare guide)
How Many Embryos Are Transferred?
| Age | Recommended number |
|---|---|
| Under 35 | 1 (single embryo transfer) |
| 35-37 | 1 (or 2 with a prior failed cycle) |
| 38-40 | 1-2 |
| Over 40 | 2-3 (or more, per clinic policy) |
Elective single embryo transfer (eSET) is strongly recommended under 35 to avoid the risks of twin and higher-order pregnancies.
Step 8: What Happens After Transfer — and When Do You Test?
After transfer you take progesterone to support the uterine lining until the pregnancy blood test.
| Form | Examples | Frequency |
|---|---|---|
| Vaginal suppository/gel | Crinone, Endometrin | Daily |
| Intramuscular injection | Progesterone in oil | Daily |
| Oral | Prometrium | Less common |
When Can Pregnancy Be Confirmed?
- 10-14 days after transfer: blood test for hCG
- hCG above 50 mIU/mL: usually indicates pregnancy
- hCG above 100 mIU/mL at 14 days: strong positive — an ultrasound is scheduled
- 4-5 weeks after transfer: ultrasound confirms the fetal heartbeat
What If the Test Is Negative?
One negative result is common — many patients need several cycles. Per SART data, roughly 65-70% of patients achieve pregnancy within 3 completed cycles.
How Long Does the Whole IVF Process Take?
Add it up and a standard cycle fits into about one month of active treatment.
| Step | Duration | Clinic visits |
|---|---|---|
| Initial workup & consultation | 1-2 weeks (can be done beforehand) | 1-2 |
| Ovarian stimulation | 8-14 days | 4-6 |
| Trigger shot | 1 day | 0 (self-injected) |
| Egg retrieval | 1 day (30-min procedure) | 1 |
| Fertilization & embryo culture | 3-6 days | 0 |
| PGT testing (optional) | 7-14 days | 0 |
| Embryo transfer | 1 day (15-min procedure) | 1 |
| Luteal support & pregnancy test | 14 days | 1 |
| Total without PGT | ~4 weeks | ~8 visits |
| Total with PGT | ~6 weeks | ~8 visits |
Real Patient Examples
The cases below are anonymized examples drawn from common clinical scenarios observed in reproductive endocrinology practice.
Case 1: First-cycle success — Emily, 33
Emily from Austin, Texas completed one fresh IVF cycle locally. Stimulation produced 12 eggs, 9 fertilized via ICSI (male factor), and one Day-5 blastocyst was transferred.
Her 14-day hCG was 450 mIU/mL — a strong positive — and her daughter was born at 39 weeks. Total cost with medication: $18,500.
Case 2: PGT-A at 40 — Lisa, 40
Lisa from Chicago retrieved 7 eggs; 4 fertilized and 3 reached blastocyst. PGT-A showed 2 euploid and 1 aneuploid embryo.
One euploid blastocyst was transferred in a frozen cycle six weeks later and resulted in pregnancy. Total cost with PGT-A: $24,000.
Case 3: Three cycles to success — Priya, 37
Priya from Toronto needed 3 cycles. The first produced no blastocysts; the second gave 2 low-grade embryos that did not implant.
At a new clinic she changed stimulation protocols, produced 5 blastocysts, and the first frozen transfer ended in a live birth. Three cycles cost about CAD $32,000.
FAQ
Q: How long does one IVF cycle take?
A complete cycle without PGT takes about 4 weeks, from starting stimulation to the pregnancy test. Adding PGT-A extends it by 1-2 weeks because embryos are frozen while results are pending.
Q: Do all fertilized eggs become transferable embryos?
No. Typically 70-80% of mature eggs fertilize, and only about 40-60% of those reach the blastocyst stage on Day 5-6.
Women over 40 may see only 10-30% of fertilized eggs become usable blastocysts.
Q: Is egg retrieval painful?
You are sedated or under general anesthesia, so the 20-30 minute procedure itself is painless. Most women feel mild period-like cramping for 1-2 days afterward; severe pain is rare and should be reported to the clinic.
Q: What is the success rate of one IVF cycle?
Per SART 2023 data, live birth rates per intended egg retrieval (including all embryo transfers from that retrieval) are 53.2% under 35, 39.9% at 35-37, 26.2% at 38-40, 13.2% at 41-42, and 4.1% over 42. Note that this denominator counts every started retrieval — cancelled cycles and cycles that produced no transferable embryo included — so it is not directly comparable to per-transfer figures. See our IVF success rate guide for details.
Q: How many eggs do I need for a good chance of success?
Research suggests 10-15 mature eggs per retrieval give the best odds of at least one euploid blastocyst. Quality beats quantity, though — a single good embryo can be enough, and your AMH and antral follicle count help predict your yield.
Q: Can I keep working during treatment?
Yes. Most women work normally through the 8-14 days of stimulation, take retrieval day and the day after off, and return to normal activity immediately after transfer — extended bed rest does not improve success rates.
Q: What happens if my cycle is canceled?
About 10-15% of cycles are canceled before retrieval for poor response, OHSS risk, or other medical reasons. You typically lose the medication cost (50-70% of total spending), but clinics often refund part of unused services.
Q: How much does one IVF cycle cost?
In the US, a single cycle runs $15,000 to $30,000 including medication. Prices vary dramatically by country — our IVF cost guide compares 12+ destinations.
What Should Your Next Step Be?
IVF is a 7-step medical process spanning 4-6 weeks: stimulate → retrieve → fertilize → culture → (optional PGT) → transfer → test. Every step has a clear purpose and most patients tolerate it well — success depends mainly on age, egg quality, and clinic expertise, not on strict rest during the two-week wait.
Book a fertility assessment with a reproductive endocrinologist first, and use our guide to choosing an IVF clinic to shortlist centers. You can also compare vetted international clinics with transparent pricing and success data on ProIVF.
Written by the ProIVF Medical Editorial Team and reviewed by the ProIVF Medical Advisory Board — licensed reproductive medicine professionals. Last updated: July 2, 2026. This guide is reviewed regularly for medical accuracy. IVF protocols vary by clinic and patient; always consult a licensed reproductive endocrinologist for personalized advice and verify details directly with your chosen clinic before starting treatment.
Content Authorship
This walkthrough was written by the ProIVF Medical Editorial Team and reviewed by the ProIVF Medical Advisory Board. It is based on published data and clinical guidance from the CDC, ASRM, and SART, combined with clinical practice experience.
