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How IVF works, one step at a time.
A plain-language guide for patients, families and anyone curious. It describes what usually happens at each stage. Your own clinic will explain your plan, which may look different.
IVFIn vitro fertilizationFertility treatment in which eggs are collected, fertilized in a lab, and an embryo is later placed in the uterus.
The big picture
Typical timing, branching paths, and why numbers change at each step.
No two fertility cycles follow the exact same calendar. Some move straight from retrieval to a fresh transfer; many pause after blastocyst culture for genetic testing or a frozen embryo transfer (FET) in a later cycle [1, 2, 5].
From initial workup to graduation, pause or long-term storage
Illustrative day ranges · every clinic tailors your protocol
- 01–02
Intake & Workup
2–6 weeks pre-cycle
- 03
Stimulation
Days 1–12 (daily monitoring)
- 04–05
Trigger → Retrieval
36.0h timed window
- 06
Lab & PGT
Days 0–7 embryo culture
- 07
Embryo Transfer
Fresh or frozen cycle
- 08–09
Beta-hCG & Cryo
Day 9–14 → OB or storage
When plans change: freeze-all, PGT wait, or a chosen pause
Stops routine medication and appointment reminders right away and resumes only when you and your clinician set the next plan.
Follicles on ultrasound are not one-to-one with blastocysts
Educational illustration · not a prediction of individual outcomes
Follicles measured on ultrasound
Ultrasound counts fluid-filled sacs in millimeters. Not every visible follicle holds a retrievable egg.
Eggs (oocytes) retrieved
The embryologist scans follicular fluid for cumulus-oocyte complexes (COCs) immediately during aspiration.
Mature eggs (Metaphase II)
Only nuclear-mature MII eggs can fertilize via conventional insemination or ICSI.
Normal fertilization (2PN)
Checked 16–18 hours later for two pronuclei. Some mature eggs do not fertilize or fertilize abnormally.
Blastocyst stage reached
A subset of dividing embryos compact into a morula (Day 4) and form a differentiated blastocyst by Day 5–7.
- Why you are seeking care
Step 01 of 09
Referral & intake
Your clinic learns why you are seeking care, who is involved, and what has to happen first.
People come to IVF for different reasons: infertility evaluation, a known single-gene condition, donor-assisted or reciprocal IVF family building, or urgent fertility preservation before cancer treatment or other gonadotoxic therapy. The first step is recording which clinical path applies, who is contributing eggs or sperm, who intends to carry a pregnancy, who holds legal parent consent, and whether an oncology therapy date makes the timeline urgent.
Timing, questions for your clinic & OvaFlow boundary
Typical rhythmUsually 1 to 3 weeks from referral to first consultation, or within 24–72 hours for urgent fertility preservation before oncology care.
Questions for your care team- Which prior records, operative notes or lab results should be sent before our first visit?
- If two people or a donor are involved, who needs their own separate chart and intake appointment?
Clinic vs. OvaFlow roleYour REI physician defines your clinical pathway. OvaFlow tracks which records, consents and contributor intakes are still expected so nothing is silently assumed complete.
How a clinic team coordinates this stage4 Words you may hear
- Fertility preservation
- Freezing eggs, sperm or embryos for later use, sometimes urgently before a treatment such as chemotherapy.
- Reciprocal IVF
- A path where one person provides the eggs and the other carries the pregnancy.
- Intended parents
- The people who will be the parents of a child born through treatment, including when a donor or gestational carrier is involved.
- Reason for care
- Why someone is seeking treatment, for example infertility, a genetic condition, donor or reciprocal treatment, or preserving fertility. It shapes which steps come next.
- Tests, consents and coverage
Step 02 of 09
Workup & readiness
Tests, consents, coverage and medications are lined up before a cycle begins.
Before stimulation begins, ovarian reserve and uterine evaluation, semen analysis or donor vial verification, infectious-disease screening, custom single-gene genetic testing preparation (PGT-M), procedure consents, and specialty pharmacy prior authorizations all have to come together. Because these items cross multiple people and outside labs on different calendars, each prerequisite needs its own owner and status before Day 1.
Timing, questions for your clinic & OvaFlow boundary
Typical rhythmOften spans 2 to 6 weeks across one menstrual cycle to complete baseline bloodwork (AMH, infectious disease), cavity imaging (SIS or HSG), semen analysis and insurance prior authorization.
Questions for your care team- Which tests must be timed to specific cycle days, and which can be drawn any day?
- Are our medical clearance and our insurance prior authorization both complete before we order medications?
Clinic vs. OvaFlow roleClinicians interpret every lab and imaging result. OvaFlow displays clinical readiness and financial authorization side by side so one never stands in for the other.
How a clinic team coordinates this stage4 Words you may hear
- Workup
- The tests and assessments done before treatment begins. When two people are involved, each has their own.
- PGT-M
- Genetic testing for a specific inherited condition. It often needs family samples and lab preparation before the cycle starts.
- Prior authorization
- Approval from an insurer before a medication or procedure is covered.
- Readiness gate
- Clinical and financial readiness shown side by side before a cycle starts, without either one standing in for the other.
- Several follicles grow at once
Step 03 of 09
Stimulation & monitoring
Daily injections help several follicles (fluid-filled sacs that may each contain an egg) grow at the same time, with regular scans and blood tests to check progress.
During ovarian stimulation—typically 8 to 12 days of daily gonadotropin injections—morning ultrasounds measure growing follicles while blood tests track estradiol and progesterone. Results from in-house or satellite labs come back by midday so the physician can confirm or adjust evening medication doses and schedule the next scan.
Timing, questions for your clinic & OvaFlow boundary
Typical rhythmTypically 8 to 14 days of daily injectable medications, with 4 to 7 morning ultrasound and blood-draw visits that become more frequent as follicles grow.
Questions for your care team- When during the afternoon will the clinic send my updated dose instructions after morning monitoring?
- Who should I call after hours if a specialty pharmacy delivery is delayed or a pen dose looks short?
Clinic vs. OvaFlow roleOnly a clinician sets or changes doses in the clinic's own EMR. OvaFlow links every patient instruction back to the clinician-signed source and retires superseded versions.
How a clinic team coordinates this stage4 Words you may hear
- Ovarian stimulation
- Daily injections that help several follicles (fluid-filled sacs that may each contain an egg) grow at the same time. Not every follicle yields an egg.
- Estradiol
- A hormone measured in blood tests during monitoring.
- Monitoring
- Ultrasounds and blood tests during stimulation that guide the clinician's decisions on doses and timing.
- E-prescribing
- Sending prescriptions electronically from the clinic's own system. Prescribing and dose changes happen there, by a clinician. OvaFlow never prescribes or sends doses.
- Given at an exact time
Step 04 of 09
Trigger
A timed injection finishes egg maturation, so the retrieval about 36 hours later lines up.
When leading follicles are ready, the trigger shot is given at an exact evening time because egg retrieval is planned about 35 to 36 hours later. Your clinic tells you the exact time, and if anything changes, the newest signed instruction is the one to follow.
Trigger shotEgg retrievalTiming, questions for your clinic & OvaFlow boundary
Typical rhythmA single high-precision evening window: egg retrieval is scheduled about 35 to 36 hours after the trigger injection so final egg maturation lines up with aspiration.
Questions for your care team- What exact time—and in what time zone—should I take my trigger shot, and how should I confirm once I have taken it?
- Who do I call immediately if I take the injection early, late, or have a problem mixing the vial?
Clinic vs. OvaFlow roleYour physician orders the trigger medication and time. OvaFlow tracks the patient's confirmation, preserves time-zone offsets across daylight-saving changes, and alerts the on-call nurse if confirmation does not arrive on time.
How a clinic team coordinates this stage4 Words you may hear
- Trigger shot
- A timed injection that finishes egg maturation, so the retrieval about 36 hours later lines up.
- Egg retrieval
- A short procedure, usually under sedation, to collect eggs from the ovaries.
- Daylight-saving change
- When clocks change between the trigger and the retrieval (for example from PDT to PST), the wall-clock difference and the actual elapsed time differ by an hour. Each time needs its offset, such as PDT or PST, to be counted correctly.
- Patient-reported use
- The patient's own account of when they took a medication, kept with the reported and received times.
- A short procedure
Step 05 of 09
Retrieval & recovery
Eggs are collected in a short procedure, and the care team checks in on your recovery afterward.
Egg retrieval is an ultrasound-guided procedure under sedation that usually takes 15 to 30 minutes, followed by recovery in the clinic and structured check-ins at home. Afterward, the team watches for ovarian hyperstimulation syndrome (OHSS): an over-response to stimulation medicines that can cause rapid fluid shifts, bloating or abdominal pain in the days after retrieval. Symptom questions always go to the clinic's care team, and emergencies to 911.
Timing, questions for your clinic & OvaFlow boundary
Typical rhythmThe procedure itself takes about 15 to 30 minutes under sedation, followed by 1 to 2 hours in recovery and several days of at-home symptom check-ins.
Questions for your care team- Which post-retrieval symptoms are expected, and which warning signs (such as rapid weight gain, severe pain or shortness of breath) mean I should call right away?
- When will the embryology lab share how many eggs were retrieved and how many were mature?
Clinic vs. OvaFlow roleMedical evaluation of post-procedure symptoms stays with your clinical team (and emergencies go to 911). OvaFlow assigns a named discharge owner so post-op check-ins are never left unowned.
How a clinic team coordinates this stage4 Words you may hear
- Egg retrieval
- A short procedure, usually under sedation, to collect eggs from the ovaries.
- OHSS
- Ovarian hyperstimulation syndrome: an over-response to stimulation medicines that can cause swelling, bloating or pain in the days after the trigger and retrieval, and sometimes later. Symptom questions always go to the clinic, and emergencies to 911.
- Freeze-all
- A clinician's decision to freeze all embryos instead of doing a fresh transfer in the same cycle.
- Discharge owner
- The named person responsible for follow-up after someone goes home from a procedure.
- Days of growth in the lab
Step 06 of 09
Embryology & PGT
In the lab, eggs are fertilized and embryos develop; some families also choose genetic testing.
From Day 0 conventional insemination or intracytoplasmic sperm injection (ICSI, injecting a single sperm into an egg) through Day 1 fertilization checks and Day 5 to 7 blastocyst culture, embryologists track every dish and embryo individually. When families use preimplantation genetic testing (PGT), trophectoderm biopsy samples go to a reference genetics lab while embryos are frozen—and every specimen label, biopsy tube and amended report must stay tied to the exact embryo.
Timing, questions for your clinic & OvaFlow boundary
Typical rhythmFertilization (2PN) is checked on Day 1 (16–18 hours after insemination); embryos grow in the incubator through Day 5 to Day 7; PGT biopsy results typically return in 1 to 3 weeks.
Questions for your care team- On which days does your lab call or message with updates (for example Day 1 fertilization and Day 5–7 blastocyst summary)?
- If we are doing PGT-A or PGT-M, how are biopsy samples tracked while we wait for the genetics laboratory report?
Clinic vs. OvaFlow rolePhysical sample witnessing and embryo grading happen inside the embryology lab's own systems. OvaFlow tracks expected lab and genetics reports so a delayed accession or pending update is visible to the coordinator.
How a clinic team coordinates this stage6 Words you may hear
- PGT
- Genetic testing of a few cells from an embryo before transfer.
- PGT-M
- Genetic testing for a specific inherited condition. It often needs family samples and lab preparation before the cycle starts.
- Blastocyst
- An embryo at about five to seven days of development.
- Embryo biopsy
- Removing a few cells from an embryo for genetic testing. One embryo can have more than one biopsy record.
- Witnessing
- A lab check, often by two people or a dedicated system, that confirms the right sample goes with the right patient. It stays in the lab's own witnessing process; OvaFlow does not perform or replace it.
- Lot recall
- A manufacturer notice that a batch of lab supplies, such as culture media, may be affected and needs to be traced.
- Fresh or frozen
Step 07 of 09
Transfer
An embryo is placed in the uterus, fresh or after freezing, on a date your clinician confirms.
Whether a transfer is fresh or uses a frozen embryo (FET) on a natural-ovulation or programmed hormone schedule, the calendar date stays provisional until lining checks, progesterone timing and physician sign-off align. Warming is authorized for one specific embryo by its unique identifier, and if that embryo does not survive warming, any next step requires a fresh clinical decision and consent rather than an automatic backup thaw.
Timing, questions for your clinic & OvaFlow boundary
Typical rhythmA fresh transfer happens 3 to 5 days after retrieval; a frozen embryo transfer (FET) happens in a later natural or programmed cycle once the uterine lining is ready.
Questions for your care team- Are we planning a natural/modified-natural FET or a programmed FET, and what is the clinical reason for that choice?
- Exactly when do I start progesterone support, and which embryo has been authorized for warming?
Clinic vs. OvaFlow roleEmbryo selection, warming authorization and luteal dosing are clinician-signed decisions. OvaFlow verifies that patient, carrier (if applicable) and embryo disposition consents match before preparation.
How a clinic team coordinates this stage3 Words you may hear
- FET
- Placing a warmed, previously frozen embryo in the uterus, in a later cycle.
- Warming
- Bringing vitrified (flash-frozen) embryos or eggs out of storage so they can be used. Which ones are warmed is a specific, authorized decision.
- Gestational carrier
- A person who carries a pregnancy for intended parents, with their own role, chart and consent.
- Until your obstetric team takes over
Step 08 of 09
Pregnancy & OB graduation
After a positive test, the clinic follows early pregnancy until your obstetric team takes over.
About 9 to 14 days after embryo transfer, a pregnancy blood test (beta-hCG) checks for implantation. A positive blood test begins early pregnancy surveillance: serial blood draws when needed, active follow-up for any pregnancy of unknown location (PUL) until a scan confirms location and viability, luteal medication taper dates, and a formal transition packet to obstetrics where the fertility clinic remains responsible until the receiving OB team explicitly accepts care.
Timing, questions for your clinic & OvaFlow boundary
Typical rhythmA first beta-hCG blood test is drawn 9 to 14 days after transfer, followed by a repeat draw 48 hours later and early ultrasounds around 6 to 9 weeks before graduating to OB care.
Questions for your care team- Which luteal medications do I continue while we follow beta-hCG trends and early ultrasounds?
- When we graduate to my OB or midwife, how do we confirm they have received my fertility records and accepted my care?
Clinic vs. OvaFlow roleClinicians interpret beta-hCG trends and ultrasound findings (including pregnancies of unknown location). OvaFlow keeps graduation open until the receiving OB team explicitly confirms acceptance.
How a clinic team coordinates this stage4 Words you may hear
- Beta-hCG
- A blood test that detects pregnancy.
- Pregnancy of unknown location
- A positive pregnancy test when an ultrasound has not yet shown where the pregnancy is.
- Luteal support
- Hormone support, usually progesterone, given around transfer and into early pregnancy as prescribed. It often starts before the transfer.
- OB graduation
- Moving care from the fertility clinic to an obstetric team. It counts only once the receiving team accepts.
- Storage can last years
Step 09 of 09
Cryo & long‑term
Frozen eggs or embryos can stay in storage for years, and the clinic keeps in touch with you about your choices.
Frozen eggs, sperm and embryos can remain in liquid-nitrogen cryostorage for many years across clinic moves, family growth and changing life plans. Managing long-term custody means keeping shipping authorization separate from clinical-use clearance, reconciling dry-shipper manifests cane by cane on arrival, logging every outreach and fee payment before any unclaimed-tissue review, freezing action when two signatories disagree on disposition, and routing late-onset donor medical updates across clinics.
Timing, questions for your clinic & OvaFlow boundary
Typical rhythmSpans months to many years of liquid-nitrogen cryostorage, annual storage renewals, inter-clinic transport, or returning for a sibling transfer.
Questions for your care team- Which agreements and signatures are required before stored embryos or eggs can be warmed, moved to another clinic, donated or discarded?
- How does the clinic reach us if our contact information changes over the years?
Clinic vs. OvaFlow roleCryo inventory and physical chain-of-custody stay in the lab's cryostorage system. OvaFlow tracks multi-party disposition consents and notice periods so no action proceeds on an incomplete agreement.
How a clinic team coordinates this stage4 Words you may hear
- Cryopreservation
- Freezing eggs, sperm or embryos for long-term storage.
- Disposition
- A decision about what happens to stored embryos or eggs. It needs the right people's agreement before anything is done.
- Chain of custody
- The record of who held stored material and when, including when it moves between facilities.
- Donor
- A person who provides eggs, sperm or embryos for someone else's treatment. Later health updates may need to reach every clinic holding related material.
- At your pace
Sometimes
When plans change
If treatment pauses, stops or doesn't work, your care team changes the plan with you, at your pace.
Real IVF care branches frequently: a stimulation cycle may be canceled for low or excessive ovarian response, a planned fresh transfer may convert to freeze-all for ovarian hyperstimulation syndrome (OHSS) prevention or genetic testing wait times, an embryo transfer may not result in pregnancy, an early pregnancy may end in loss, or a person may choose a pause to recover emotionally, physically or financially. Each transition requires reconciling downstream orders and bookings, silencing routine reminders, offering confidential support, and keeping the door open for a return on the patient's own timing.
This branch can open at almost any point. A return happens on the patient's timing, often to planning, a frozen transfer, or long-term storage choices.
Timing, questions for your clinic & OvaFlow boundary
Typical rhythmCan happen at any point: a cancelled stimulation, a conversion to IUI, a freeze-all pivot, a pregnancy loss, or a patient-chosen pause between cycles.
Questions for your care team- If our cycle changes or stops, will automated medication and appointment reminders be turned off right away?
- When we are ready to talk about next steps, will we have a dedicated follow-up visit with our physician?
Clinic vs. OvaFlow roleNext-step counseling is always clinician-led. OvaFlow's sensitivity and vital-status stop halts routine reminders and congratulatory templates immediately when a loss, cancellation or pause is recorded.
How a clinic team coordinates this stage3 Words you may hear
- Freeze-all
- A clinician's decision to freeze all embryos instead of doing a fresh transfer in the same cycle.
- Treatment pause
- A break in treatment that the patient chooses. Reminders stop, and returning happens on the patient's timing.
- Pregnancy loss
- The end of a pregnancy before birth. Care afterward is clinician-led, and routine reminders should stop.
Common questions
What patients and families often ask about the IVF timeline.
How long does one complete IVF cycle usually take from start to finish?
Once pre-cycle workup and insurance prior authorization are complete (often 2 to 6 weeks), the active ovarian stimulation, trigger and egg retrieval phase typically takes about 2 weeks. After retrieval, embryos grow in the laboratory for 5 to 7 days. If you do a fresh transfer, the pregnancy blood test follows 9 to 14 days later. If you freeze embryos for genetic testing (PGT) or a frozen embryo transfer (FET), the transfer happens in a subsequent cycle several weeks or months later.
Why is the trigger shot timed to the exact minute, and why does daylight saving time matter?
The trigger injection (hCG, GnRH agonist or dual trigger) restarts meiosis in the eggs so they become mature and detach from the follicle wall. If retrieval happens too early, fewer eggs may be mature; if it happens too late, ovulation may already have occurred. When clocks shift between Pacific Daylight Time (PDT) and Pacific Standard Time (PST) between trigger night and retrieval morning, wall-clock numbers shift by an hour even though biological elapsed time is still 36 hours—which is why OvaFlow displays both the local time and UTC offset.
Why might a clinician recommend freezing all embryos ('freeze-all') instead of transferring right away?
According to ASRM, ESHRE and NICE NG257 guidelines, clinicians often recommend freezing all viable embryos when hormone levels or follicle counts indicate an elevated risk of ovarian hyperstimulation syndrome (OHSS), when progesterone rises prematurely before retrieval, when preimplantation genetic testing (PGT-A, PGT-M or PGT-SR) is planned, or when the uterine lining needs separate preparation.
What is the difference between a natural (or modified-natural) FET and a programmed FET?
In a natural or modified-natural frozen embryo transfer, the clinic tracks your body's own growing follicle and ovulation, preserving the corpus luteum—the temporary ovarian structure that produces hormones and vasoactive factors during early pregnancy. In a programmed (hormone-replacement) FET, scheduled estrogen and progesterone prepare the lining while ovulation is suppressed. Recent randomized clinical trial evidence and SMFM guidance note that ovulatory cycles with a corpus luteum have lower rates of hypertensive disorders of pregnancy when clinically appropriate.
What happens if a cycle is cancelled, converted to IUI, or ends in a pregnancy loss?
Plans change frequently in fertility care—whether from an unexpected ovarian response, an accession hold, or an early pregnancy loss. Medically, your clinician leads a dedicated review before any new plan is made. Operationally, OvaFlow is designed so a sensitivity or vital-status flag immediately stops routine medication prompts, appointment nudges and congratulatory templates so patients are never sent out-of-context automated messages.
Does OvaFlow give medical advice, choose doses, or grade embryos?
No. OvaFlow is a coordination workflow layer built to sit beside a clinic's own EMR, portal and laboratory systems. Every diagnosis, medication order, dose change, trigger time, embryo grade and transfer decision stays with qualified clinicians and embryologists in the clinic's own systems.
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