How IVF Works Step by Step: Understanding the IVF Process

Jessica Rogalski

July 6, 2023

For many intended parents experiencing infertility or pursuing assisted reproduction, in vitro fertilization (IVF) can provide a path toward pregnancy and family building.

IVF is one of the most widely used fertility treatments in the world and has helped millions of individuals and couples conceive successfully. However, for many people beginning fertility treatment, understanding how IVF works step by step can initially feel overwhelming.

IVF involves fertilizing eggs outside the body within a laboratory setting before transferring embryos into the uterus in hopes of achieving pregnancy. While every fertility journey is unique, understanding the IVF process can help intended parents feel more informed and prepared throughout treatment.

Whether using a partner’s sperm, donor sperm, donor eggs, or reciprocal IVF, fertility specialists customize treatment plans based on each patient’s reproductive health, fertility history, and family-building goals.

What Is IVF?

IVF stands for:

in vitro fertilization

The term “in vitro” means “outside the body.” During IVF, eggs are retrieved from the ovaries and fertilized with sperm in a laboratory. After fertilization, embryos are carefully monitored before one or more are transferred into the uterus.

IVF may be recommended for individuals or couples experiencing:

blocked fallopian tubes
male infertility
endometriosis
ovulation disorders
unexplained infertility
recurrent pregnancy loss
age-related fertility decline

IVF may also be used with donor sperm, donor eggs, gestational surrogacy, or reciprocal IVF, depending on the intended parents’ reproductive goals.

Step 1: Fertility Testing and Consultation

The IVF process usually begins with a fertility evaluation and consultation. Before treatment starts, fertility specialists typically perform testing to better understand reproductive health and determine whether IVF is an appropriate treatment option.

Testing may include:

hormone testing
ovarian reserve testing
ultrasound imaging
semen analysis
infectious disease screening
genetic testing

These evaluations help fertility specialists develop a personalized treatment plan based on each patient’s fertility needs and medical history.

At Cryobank America, donor sperm specimens undergo extensive screening, semen analysis, infectious disease testing, and genetic evaluation designed to support reproductive safety and specimen quality.

Step 2: Ovarian Stimulation

During a natural menstrual cycle, the ovaries usually release one mature egg. IVF treatment uses fertility medications to stimulate the ovaries to develop multiple eggs during a single cycle, which may increase the chances of successful fertilization and embryo development.

Common medications may include hormones such as follicle-stimulating hormone (FSH), luteinizing hormone (LH), and gonadotropin-releasing hormone (GnRH). These medications help stimulate follicle growth and prepare the eggs for retrieval.

Because every patient responds differently to fertility medications, close monitoring throughout this stage is extremely important.

Step 3: Monitoring During IVF

Throughout ovarian stimulation, fertility specialists carefully monitor the ovaries using bloodwork and ultrasound imaging. Monitoring helps evaluate follicle growth, hormone levels, ovarian response, and egg maturation.

Once the follicles reach appropriate maturity, patients receive a “trigger shot,” often containing human chorionic gonadotropin (hCG), which helps prepare the eggs for retrieval.

Timing is critical during this phase because egg retrieval must occur shortly before natural ovulation.

Step 4: Egg Retrieval

Egg retrieval is a minimally invasive procedure typically performed under sedation. Using ultrasound guidance, a fertility specialist inserts a thin needle through the vaginal wall into the ovaries to collect mature eggs from the follicles.

The procedure itself usually takes up to 30 minutes. After retrieval, the eggs are transferred immediately to the embryology laboratory for evaluation and fertilization.

Although egg retrieval is generally considered safe, some patients may experience temporary cramping, bloating, or mild discomfort afterward.

Step 5: Sperm Collection and Preparation

At the same time as egg retrieval, sperm is collected and prepared for fertilization. Sperm may come from:

a partner
a sperm donor
previously frozen specimens

The laboratory evaluates sperm quality by examining sperm count, motility, and morphology before preparing the sample for fertilization.

In some cases, donor sperm specimens may already be frozen and professionally prepared prior to treatment.

Step 6: Fertilization

Once the eggs and sperm are prepared, fertilization occurs within the laboratory.

There are two primary fertilization methods used during IVF:

conventional IVF
intracytoplasmic sperm injection (ICSI)

During traditional IVF, sperm and eggs are combined in a laboratory dish, and fertilization occurs naturally. In some cases, fertility specialists recommend ICSI, which involves injecting a single sperm directly into an egg.

ICSI is commonly used in cases involving:

low sperm count
poor sperm motility
abnormal sperm morphology
prior fertilization failure
severe male infertility

The appropriate fertilization method depends on sperm quality, fertility history, and laboratory recommendations.

Step 7: Embryo Development

After fertilization, embryos are carefully monitored in the laboratory over several days. As embryos continue to divide and develop, embryologists evaluate their growth patterns, cell division, and overall quality.

By day 5 or 6, many embryos reach the blastocyst stage, often considered the optimal stage for embryo transfer.

Embryo development is one of the most important parts of the IVF process because healthy embryo growth plays a major role in implantation and pregnancy success.

Step 8: Genetic Testing (Optional)

Some intended parents choose preimplantation genetic testing (PGT) before embryo transfer. PGT may help identify chromosomal abnormalities, certain genetic conditions, or concerns about embryo viability before implantation.

This testing may help fertility specialists select embryos with normal chromosome patterns for transfer, particularly for individuals with recurrent pregnancy loss, advanced maternal age, or known genetic conditions.

Not every IVF patient requires genetic testing, and recommendations vary depending on each fertility situation.

Step 9: Embryo Transfer

Embryo transfer is the next major step in the IVF process. During this procedure, one or more embryos are placed into the uterus using a thin catheter.

Embryo transfer is generally:

quick
minimally invasive
performed without anesthesia in many cases

After transfer, the embryo must successfully implant in the uterine lining and continue developing for pregnancy to occur.

Step 10: The Two-Week Wait

After embryo transfer comes what many patients call the “two-week wait.” This period involves waiting to determine whether implantation and pregnancy occurred successfully.

Patients often continue taking hormone medications during this time to help support the uterine lining and early pregnancy development. Approximately 9–14 days after embryo transfer, bloodwork is typically performed to measure hCG levels and confirm pregnancy.

For many intended parents, this stage can feel emotionally challenging because of the anticipation and uncertainty involved.

IVF Success Rates

IVF success rates vary depending on several factors, including:

age
egg quality
sperm quality
embryo quality
reproductive health
fertility diagnosis

In general, younger patients tend to experience higher IVF success rates, although many individuals conceive successfully across a wide range of fertility circumstances and ages.

Success rates may also vary between fertility clinics, laboratory protocols, and treatment plans.

Emotional and Physical Aspects of IVF

IVF can be physically and emotionally demanding for many intended parents. Some individuals experience stress, anxiety, hormonal side effects, emotional exhaustion, or uncertainty throughout treatment.

Support systems such as fertility counselors, therapists, support groups, friends, and family members may help intended parents navigate the emotional aspects of fertility treatment with greater confidence and reassurance.

IVF With Donor Sperm

Many intended parents pursue IVF with donor sperm for reasons such as:

male infertility
single parenthood by choice
LGBTQ+ family building
genetic concerns

At Cryobank America, donor sperm specimens undergo extensive screening and quality evaluation designed to support IVF treatment and reproductive planning.

Understanding How IVF Works Step by Step

Understanding how IVF works step by step can help intended parents feel more informed and prepared throughout the fertility journey. While every IVF experience is unique, the process generally involves fertility testing, ovarian stimulation, egg retrieval, fertilization, embryo development, embryo transfer, and pregnancy testing.

Advancements in reproductive medicine continue improving IVF success rates and expanding fertility options for intended parents around the world.

Happy, Healthy, Families begin here...

Get started on your journey to finding the perfect donor!

Create A Free Account