In Vitro Fertilization (IVF): A Complete Guide

In Vitro Fertilization, commonly known as IVF, is an assisted reproductive technology (ART) in which eggs are retrieved from a woman's ovaries and fertilized with sperm in a laboratory setting. The resulting embryo is then transferred back into the uterus with the aim of achieving a successful pregnancy.

The term "in vitro" is Latin for "in glass," referring to the laboratory environment in which fertilization takes place — outside the body. IVF has been performed since 1978, when Louise Brown became the first IVF baby. In India, the first IVF birth occurred in 1986, and the country now has one of the highest volumes of IVF cycles performed globally.

IVF is recommended for a wide range of fertility challenges. Your reproductive endocrinologist (REI) will evaluate your specific situation before recommending IVF as a first-line or subsequent treatment option.

• Blocked or damaged fallopian tubes — IVF bypasses the tubes entirely, making it highly effective for tubal factor infertility.
• Severe male factor infertility — Low sperm count, poor motility, or abnormal morphology; often combined with ICSI.
• Endometriosis — Moderate to severe endometriosis affecting egg quality or tubal function.
• Unexplained infertility — When no specific cause is identified after a full workup and simpler treatments have failed.
• Ovulation disorders — PCOS and other conditions affecting regular ovulation.
• Diminished ovarian reserve — Low AMH or antral follicle count (AFC) requiring controlled stimulation.
• Genetic screening (PGT) — Couples wishing to screen embryos for chromosomal abnormalities or hereditary conditions.

During a natural menstrual cycle, only one egg typically matures and is released. IVF requires multiple eggs to maximize the chances of creating viable embryos. Ovarian stimulation uses injectable gonadotropin medications — FSH and LH — to encourage multiple follicles to develop simultaneously.

Monitoring during stimulation involves regular transvaginal ultrasounds (every 2–3 days) and blood estrogen (E2) measurements to track follicle growth and adjust medication doses. When follicles reach the optimal size (typically 18–20mm), a trigger injection (hCG or GnRH agonist) is administered to finalize egg maturation before retrieval.

Egg retrieval is performed approximately 36 hours after the trigger injection, under IV sedation or light general anesthesia. Using transvaginal ultrasound guidance, the embryologist passes a thin needle through the vaginal wall into each ovarian follicle to aspirate the follicular fluid containing the eggs.

The procedure typically takes 20–30 minutes. Most women experience mild cramping and spotting afterward and can return home the same day. The number of eggs retrieved varies widely — typically 8–15 in women with normal ovarian reserve — though not all retrieved eggs will be mature or suitable for fertilization.

Retrieved eggs are assessed for maturity and then fertilized using either conventional IVF (placing eggs and sperm together in a culture dish) or ICSI (injecting a single sperm directly into each mature egg). Fertilization is confirmed the following morning by the presence of two pronuclei.

Fertilized eggs (now called zygotes) are cultured in a specialized incubator for 3–6 days. Most clinics culture embryos to the blastocyst stage (day 5–6), which allows better selection of the most viable embryos and improves implantation rates. Embryos not transferred in a fresh cycle can be vitrified (frozen) for future use.

Embryo transfer is a simple, painless procedure that does not require anesthesia. A thin, flexible catheter is passed through the cervix into the uterine cavity, and the selected embryo(s) are deposited under ultrasound guidance. Most guidelines in India recommend transferring a single blastocyst (eSET) in women under 35 with good-quality embryos to minimize multiple pregnancy risk.

After transfer, progesterone supplementation (via vaginal pessaries, injections, or oral tablets) is continued to support the uterine lining. A beta-hCG blood test is performed 10–14 days after transfer to determine if implantation has occurred.

IVF success rates vary significantly based on age, diagnosis, embryo quality, and clinic protocols. The figures below represent live birth rates per embryo transfer cycle from ICMR and SART-aligned Indian data (2023–2024).

IVF costs in India vary considerably by city, clinic tier, and treatment complexity. The figures below represent typical ranges for a single fresh IVF cycle including medications, monitoring, egg retrieval, and embryo transfer.