IVF Process Step by Step — Complete Clinical Guide

Step 1 — Pre-Cycle Workup: What Every Test Means and Why It Matters

The pre-cycle workup is not a formality. It is the diagnostic foundation that determines your stimulation protocol, your medication doses, whether corrective steps are needed before starting, and what outcomes are realistic for your specific situation. Skipping or rushing this phase is one of the most common reasons IVF cycles underperform.

Why this matters to you: Many patients arrive at their first IVF consultation having already had some of these tests done elsewhere. Bring all results, even if they seem old — your doctor can decide what needs repeating. A thorough workup saves time and prevents surprises mid-cycle.

Tests for the Woman

AMH (Anti-Müllerian Hormone)

AMH is produced by granulosa cells in small antral follicles. It is the most reliable single marker of ovarian reserve — the quantity of eggs remaining. It is measured from a blood sample on any day of your cycle (not cycle-day dependent).

AFC (Antral Follicle Count)

A transvaginal ultrasound on Day 2–3 of your period counts the small resting follicles visible on both ovaries. Each follicle has the potential to grow and contain an egg during stimulation. AFC below 5–7 total follicles = diminished ovarian reserve, regardless of AMH. AFC above 20 = high OHSS risk.

Day 2–3 Hormone Panel

• FSH (Follicle Stimulating Hormone): Above 10–12 IU/L on Day 3 indicates reduced ovarian reserve. High FSH means the pituitary is working harder to recruit follicles — a sign of declining egg quantity.
• LH (Luteinising Hormone): Evaluated alongside FSH. Elevated LH relative to FSH (LH:FSH ratio above 2:1) is a marker for PCOS.
• Estradiol (E2): Should be below 60–80 pg/mL on Day 3. Elevated E2 suppresses FSH — meaning a normal-looking FSH value can be falsely reassuring if E2 is high.
• TSH (Thyroid Stimulating Hormone): Must be 0.4–2.5 mIU/L before IVF begins. Even subclinical hypothyroidism (TSH 2.5–5.0) is treated before treatment because it increases miscarriage risk.
• Prolactin: Elevated prolactin suppresses ovulation. Treated with cabergoline or bromocriptine before starting.

HSG or SSG

Hysterosalpingography (X-ray) or Sonosalpingography (ultrasound) confirms whether the fallopian tubes are patent. While IVF bypasses the tubes, a hydrosalpinx (fluid-filled blocked tube) leaks toxic fluid into the uterine cavity and reduces IVF success by approximately 50%. If identified, it must be surgically addressed before transfer.

Tests for the Male Partner

Semen Analysis against WHO 2021 reference values

Sperm DNA Fragmentation Index (DFI)

Standard semen analysis does not measure DNA integrity. DFI above 25–30% is associated with:

• Reduced fertilisation rates even with ICSI
• Higher embryo arrest rates at Day 3–5
• Increased miscarriage risk after successful implantation

DFI testing is recommended when: previous IVF failed despite good embryo grades, recurrent pregnancy loss, or severe morphological abnormality (below 1% normal forms).

Step 1B — Protocol Selection: Why Your Doctor Chooses Short or Long Protocol

This is one of the most important clinical decisions in an IVF cycle — and most patients are never told why their protocol was chosen. Understanding it gives you the ability to ask better questions.

The Two Main Protocols Used in India

Stimulation Medications Used in India

The Trigger Injection Decision

• hCG trigger (Ovitrelle): Standard for most patients. Mimics natural LH surge. Given when 3+ follicles reach 17–20mm.
• GnRH agonist trigger (Decapeptyl/Lupride): Used for high-OHSS-risk patients (PCOS, AMH above 4 ng/mL, estradiol above 3,000–4,000 pg/mL, 20+ follicles). Significantly reduces OHSS severity. If GnRH agonist trigger is used, a freeze-all cycle is planned from the start — fresh transfer is not done in the same cycle.

Step 2 — Ovarian Stimulation: What Happens Each Day

Most patients experience stimulation as a blur of daily injections and clinic visits. Here is exactly what is happening inside your body and inside the clinic at each stage.

Days 1–4: Stimulation Begins

Your period starts — this is Day 1. On Day 2 or 3 you return to the clinic for a baseline ultrasound and blood test before the first injection. The baseline confirms:

• No residual cysts from the previous cycle (a cyst above 20mm may delay starting)
• Endometrium is thin (below 5mm) — the lining has fully shed
• Estradiol is low (below 60–80 pg/mL) — no follicle has already started growing ahead of the others

If the baseline is clear, your first gonadotropin injection is given that evening. Injections are subcutaneous — into the lower abdomen, 2–4 cm from the navel, using a very fine needle (similar to an insulin pen). Most patients self-administer after a 10-minute demonstration from the clinic nurse.

Dose ranges typically used:

Days 5–7: First Monitoring Visit

Your first monitoring scan happens around Day 5–6. The embryologist and doctor are looking for:

• Follicle count: How many follicles are growing on each ovary, and what sizes
• Leading follicle size: Ideally 8–12mm by Day 6 — too fast or too slow triggers a dose adjustment
• Estradiol (E2): Expected range Day 6: approximately 200–400 pg/mL total. Each mature follicle (above 14mm) contributes roughly 200–300 pg/mL to your total E2 level.

If estradiol is rising too fast (above 3,000 pg/mL with many follicles) — OHSS risk protocol begins: dose reduction, possible agonist trigger decision made now.

In antagonist protocol: The GnRH antagonist (Cetrotide or Orgalutran) injection is added when the leading follicle reaches 12–14mm — typically around Day 6–8. This prevents a premature LH surge that would cause ovulation before retrieval.

Days 8–11: Peak Stimulation

Monitoring visits every 1–2 days. Your clinic is tracking:

What you will feel: Progressive abdominal bloating and fullness as follicles enlarge both ovaries. By Day 10–11 your ovaries may each be the size of a large plum (normally they are walnut-sized). Mild pelvic heaviness, breast tenderness, and fatigue are normal. Avoid any twisting exercise, running, or high-impact activity from Day 6 onward — enlarged ovaries can twist (torsion), which is a surgical emergency.

Trigger Day: The Most Time-Critical Moment

When the doctor determines 3 or more follicles have reached 17–20mm, the trigger injection is given at a precisely specified time — usually between 10pm and midnight. Egg retrieval is booked for exactly 34–36 hours later. This timing is non-negotiable: too early and eggs are not mature; too late and eggs may ovulate spontaneously inside the follicles before retrieval.

You will receive a call or message from the clinic with the exact trigger time. Set two alarms.

Step 3 — Egg Retrieval: What Happens in the Clinic and the Lab

In the Clinic

You arrive fasting (nothing by mouth after midnight). An IV line is inserted for sedation. The procedure takes place in a procedure room adjacent to the embryology laboratory — because the eggs must reach the embryologist within seconds of aspiration.

Under intravenous sedation (propofol or midazolam — you are not awake, you feel nothing), a transvaginal ultrasound probe with an attached needle guide is inserted. A fine aspiration needle (17–18 gauge) passes through the vaginal wall directly into each visible follicle under real-time ultrasound guidance. The follicular fluid — which contains the egg — is suctioned into a heated collection tube maintained at 37°C.

Duration: 15–20 minutes for a standard retrieval (10–15 follicles). Complex cases with many follicles may take up to 30 minutes.

You wake up in a recovery area. Most patients feel mild cramping — comparable to period pain — and are discharged after 1–2 hours. You cannot drive. Someone must take you home.

Post-retrieval:

• Mild bloating, pelvic aching, and light spotting for 1–2 days = normal
• Paracetamol (500–1000mg) for pain — avoid ibuprofen and NSAIDs (they may impair implantation if you proceed to fresh transfer)
• No intercourse until after pregnancy test result
• Report immediately: severe pain, vomiting, significant abdominal distension, or difficulty breathing (signs of OHSS developing)

In the Lab — What the Embryologist Does Immediately

Every tube of follicular fluid is handed directly to the embryologist, who searches it under a stereo microscope within 30–60 seconds of aspiration. The embryologist identifies and classifies each egg:

Only MII eggs are used for ICSI. In standard IVF, all eggs are inseminated together and those that fertilise are classified next day.

What Your Retrieval Number Means — Realistic Expectations

This is one of the most emotionally loaded moments of IVF. Patients frequently compare their egg numbers to others or to what their doctor predicted. Here is the clinical framework:

The key insight: A patient who retrieves 4 mature eggs and gets 1 good blastocyst has had a clinically useful cycle — 1 quality embryo is all that is needed for a successful transfer. The number of eggs retrieved matters less than the number of euploid (chromosomally normal) blastocysts that result.

Step 4 — Fertilisation in the Lab: Standard IVF vs ICSI

The male partner (or a previously frozen surgical retrieval sample) provides a semen sample on the morning of egg retrieval. The sample is processed in the lab using a "density gradient" wash — centrifugation through layers of fluid that separates motile, morphologically normal sperm from debris, dead sperm, and seminal fluid. The result is a concentrated pellet of the best available sperm.

Standard IVF (Conventional Insemination)

Approximately 50,000–100,000 motile sperm are added to each dish containing a mature MII egg in culture media. The dish is placed in the incubator. Fertilisation is not forced — the sperm must find and penetrate the egg independently over 4–6 hours.

At 16–18 hours after insemination, the embryologist examines each egg under the microscope for fertilisation:

Only 2PN embryos are cultured further.

Expected fertilisation rate with standard IVF: 60–75% of mature eggs in normal-sperm cases.

ICSI (Intracytoplasmic Sperm Injection)

ICSI is the most commonly used fertilisation method in Indian IVF cycles — used in the majority of cases whether or not a male factor is present.

The procedure, step by step:

1. 1The embryologist selects individual sperm under ​200–400× magnification using an inverted microscope with micromanipulation tools
2. 2A single sperm is immobilised by touching its tail with a glass microneedle (this prevents it from moving during injection without damaging DNA)
3. 3The selected sperm is drawn into the microneedle (approximately 5 micrometres in diameter — thinner than a human hair)
4. 4Each MII egg is held in place with a holding pipette on the left side
5. 5The microneedle penetrates the egg’s outer shell (zona pellucida) and deposits the single sperm directly into the cytoplasm
6. 6The process is repeated for each mature egg individually

Fertilisation check: Same 16–18 hour checkpoint, same 2PN criteria.

Expected fertilisation rate with ICSI: 70–85% of injected mature eggs.

Why ICSI became the default in India: It eliminates the risk of complete fertilisation failure — a rare but catastrophic outcome in standard IVF where no eggs fertilise. For this reason, many Indian clinics use ICSI routinely, including in cases where sperm parameters are entirely normal. ICSI does not improve embryo quality or implantation rate — it only addresses the fertilisation step.

Step 5 — Embryo Development: What Your Daily Reports Mean

After fertilisation confirmation, 2PN embryos are placed individually in culture media inside specialised incubators. The embryologist monitors them daily — either by briefly removing them for assessment or continuously via time-lapse imaging (EmbryoScope/Geri systems).

You will receive a report from the clinic each day. Here is how to read it:

Day 1 Report — Fertilisation

Day 3 Report — Cleavage Stage

By Day 3, normally developing embryos have divided into 6–10 cells (blastomeres). The embryologist assesses:

A Day 3 report saying "4 embryos, all Grade 1–2" is a very good sign. At this point, your doctor decides:

• Continue to Day 5 (blastocyst) — preferred when 4+ good embryos exist
• Transfer at Day 3 — considered when only 1–2 embryos remain (to avoid losing them in culture)

Day 5 Report — Blastocyst Stage

This is the most important report. By Day 5, a successful embryo has undergone compaction and cavitation — forming a blastocyst with two distinct cell populations:

• Inner Cell Mass (ICM): Becomes the fetus
• Trophectoderm (TE): Becomes the placenta

Realistic attrition from retrieval to blastocyst:

*If PGT-A testing was done

This attrition is biological selection — it mirrors what happens naturally inside the body, just invisibly. It is not a failure of the lab.

The Gardner Grading Scale — What Your Embryo Grade Actually Means

This is the grading system used by virtually all IVF labs worldwide. Every blastocyst you receive a report on will be described using three components:

Component 1 — Expansion Stage (1 to 6)

Stages 4 and 5 are the most commonly transferred. A Stage 3 blastocyst is still good — it just needs slightly more time to expand.

Component 2 — Inner Cell Mass (ICM) Grade (A, B, or C)

Component 3 — Trophectoderm (TE) Grade (A, B, or C)

Reading a Combined Grade — Examples

The critical insight: The difference between a 4AA and a 4BB blastocyst is NOT the difference between success and failure. Multiple large studies show that 4BB blastocysts achieve live birth rates only 5–10 percentage points below 4AA in women under 38. Grade B is clinically excellent — do not be alarmed by a B grade. Grade C is where caution begins.

Chromosomal normality overrides morphological grade: A beautiful 4AA blastocyst that is chromosomally abnormal (aneuploid) will not implant. A 3BB that is chromosomally normal (euploid) will. This is why PGT-A — genetic testing of the blastocyst before transfer — adds information that morphological grading alone cannot provide, especially for women over 38.

Step 6 — Embryo Transfer: Clinical Detail

Embryo transfer is the shortest procedural step — typically 5–10 minutes — and requires no sedation or anaesthesia. Most patients describe it as similar to a cervical smear (Pap test) in terms of discomfort.

Pre-Transfer Requirements

Endometrial thickness at transfer:

Endometrial pattern matters as much as thickness: a trilaminar (triple-line) pattern on ultrasound — three distinct echogenic lines — indicates a well-prepared, receptive endometrium. A homogenous, bright pattern is less favourable.

Bladder: You are asked to arrive with a comfortably full bladder. A full bladder straightens the angle between the cervix and uterine body, making catheter passage easier and providing a clear acoustic window for abdominal ultrasound guidance during the procedure.

The Procedure Step by Step

1. 1You lie in a lithotomy position. A speculum is inserted to visualise the cervix — the same as a smear test.
2. 2The cervix is cleaned with saline. No anaesthetic is injected — the cervical canal is not cut or punctured.
3. 3A soft outer sheath catheter (Wallace or Cook brand, most commonly) is guided gently through the cervical canal into the uterine cavity. Difficult cervices (tight, angled, or previously scarred) may require a firmer introducer — this is documented from previous transfers or hysteroscopy findings.
4. 4Simultaneously in the lab, the embryologist loads the selected embryo into the inner transfer catheter in a tiny volume of culture media (typically 10–20 microlitres). The embryo is sandwiched between two small air bubbles for visualisation.
5. 5The loaded inner catheter is passed through the sheath to the target position — 1.0–1.5cm from the fundus (the top of the uterine cavity). Placement too close to the fundus is associated with higher ectopic risk; too low reduces implantation probability.
6. 6The embryo is gently expelled. On abdominal ultrasound, the air bubbles show as a bright flash — confirming position.
7. 7The catheter is withdrawn slowly. The embryologist checks the catheter under the microscope immediately to confirm the embryo was released (a retained embryo is re-loaded and re-transferred in the same session).

After transfer: You rest at the clinic for 20–30 minutes, then go home normally. Bed rest is not recommended — multiple large RCTs confirm it does not improve implantation rates. Walk, go home, resume light daily activity.

Single Embryo Transfer (SET) — The Standard of Care

The cumulative live birth rate from two SET cycles (fresh then frozen) equals or exceeds one DET cycle — with dramatically lower risk of preterm birth, NICU admission, and maternal complications. Any clinic routinely recommending double transfer without documented specific clinical justification warrants scrutiny.

The FET (Frozen Embryo Transfer) Cycle — A Complete Process Variant

FET is not a lesser version of IVF — it is a full clinical protocol that in many cases achieves equal or better outcomes than fresh transfer, at significantly lower cost.

When FET Occurs

• After a freeze-all cycle (OHSS risk, thin endometrium on retrieval day, PGT-A testing required)
• Using surplus blastocysts from a previous stimulation cycle
• After a failed fresh transfer — using frozen embryos from the same retrieval

Cost: ₹30,000–₹60,000 for a FET cycle vs ₹1.2–₹3 lakh for a full fresh IVF cycle.

Two FET Protocols

Which is better? Both achieve comparable outcomes. Natural FET avoids exogenous oestrogen. Medicated FET gives the clinic more scheduling control and is preferred when cycles are irregular or anovulatory.

Embryo Thawing — What Happens

Vitrified blastocysts are stored in liquid nitrogen at -196°C. On transfer day, the embryologist warms the embryo by passing it through a series of warming solutions over 1–2 minutes. Survival rate of vitrified blastocysts: 90–95% in experienced labs. A blastocyst that survives warming and re-expands is considered viable for transfer.

Step 7 — The Two-Week Wait (TWW): What Is Actually Happening

The 10–14 days between embryo transfer and the beta-hCG blood test is the most psychologically challenging phase of the IVF cycle. Understanding the biology helps manage the uncertainty.

Implantation Timeline After Transfer

Why Home Pregnancy Tests Fail During TWW

False positive risk (Days 5–9): The hCG trigger injection (Ovitrelle) used before egg retrieval contains exogenous hCG that clears from blood over 7–10 days. A home test done before Day 10 post-transfer may detect residual trigger hCG — giving a false positive that has nothing to do with implantation.

False negative risk (Days 7–9): The blastocyst may have implanted successfully but hCG levels are not yet high enough to exceed a home test's detection threshold (typically 25 mIU/mL). A negative on Day 8 does not mean the cycle failed.

The serum beta-hCG test at Day 10–14 at your clinic is the only reliable result. Do not test at home before Day 12. Do not interpret spotting, cramping, or breast tenderness as confirming or denying pregnancy — progesterone supplementation produces all of these symptoms regardless of implantation status.

Interpreting Your Beta-hCG Result

Frequently Asked Questions — IVF Process Step by Step

These are the questions patients most commonly ask after reading this guide — or after their first clinic consultation. Every answer is written to give you the real clinical picture, not a reassuring non-answer.

Medical Disclaimer: This guide is educational and does not constitute medical advice. IVF protocols vary by clinic and individual patient profile. Always consult a qualified reproductive endocrinologist for guidance specific to your situation. Reviewed by FertilityNetwork Editorial Team · May 2026.