Egg retrieval for IVF is a minor surgical procedure where a doctor uses a thin needle, guided by ultrasound, to collect eggs directly from the ovaries through the vaginal wall. The entire process takes about 15 to 30 minutes, but getting your body ready for it starts weeks earlier. Here’s what happens at each stage, from the first injection to recovery.
Ovarian Stimulation: Weeks Before Retrieval
In a natural menstrual cycle, your ovaries typically release just one mature egg. For IVF, the goal is to develop multiple eggs at once, which requires hormone injections over roughly 8 to 14 days. These medications contain follicle-stimulating hormone (FSH), sometimes combined with luteinizing hormone (LH), and they signal your ovaries to grow several fluid-filled sacs called follicles, each potentially containing an egg.
The injections are self-administered at home using a pen-style device or a small syringe, usually into the belly. During stimulation, you’ll visit your clinic every few days for blood draws and transvaginal ultrasounds so your doctor can track how many follicles are growing and how large they’ve become. Based on those results, your medication dose may be adjusted up or down. Some women respond quickly, others need a longer stimulation window.
The Trigger Shot
Once your follicles reach the right size (generally around 18 to 20 millimeters), you’ll receive a single “trigger shot.” This injection mimics the natural hormone surge that tells eggs to complete their final stage of maturation inside the follicle. Timing is precise: retrieval is scheduled roughly 36 hours after the trigger shot, because the eggs need that window to fully mature but must be collected before your body releases them on its own.
Your clinic will give you an exact time to inject, often late at night, so the retrieval falls during morning clinic hours two days later. Missing or mistiming this shot can compromise the entire cycle.
What Happens During the Procedure
Egg retrieval is performed at the fertility clinic, not a hospital. You’ll change into a gown, and an IV line will be placed. Most clinics use intravenous sedation, a combination of a sedative and a pain reliever that puts you into a deep, sleep-like state. You won’t feel the procedure and likely won’t remember it. General anesthesia and local anesthesia are also options at some clinics, but IV sedation with local vaginal numbing is the most common approach and is considered the safest in terms of both patient comfort and IVF outcomes.
Once you’re sedated, the doctor inserts a transvaginal ultrasound probe to visualize the ovaries on a screen. A thin needle, typically 17-gauge (slightly thinner than the lead of a mechanical pencil), is attached to the ultrasound probe and guided through the vaginal wall into each follicle. The needle connects to a suction pump set at gentle, controlled pressure. As suction is applied, the fluid inside each follicle is drawn out through the needle and collected in a test tube. Each follicle is drained individually, and the doctor works through both ovaries.
The collected fluid is passed immediately to an embryologist working in the adjacent lab. The embryologist examines each tube of fluid under a microscope to identify and isolate the eggs, then places them into a specialized culture dish kept at body temperature. Not every follicle contains a usable egg. Some follicles may be empty, and some eggs won’t be mature enough for fertilization.
How Many Eggs to Expect
The number of eggs retrieved varies significantly, mostly depending on age and ovarian reserve. Retrieving between 10 and 20 mature eggs generally offers the best chance of producing at least one genetically normal embryo for transfer. Here’s how averages break down by age:
- Ages 20 to 30: 15 to 20 eggs
- Ages 31 to 35: 12 to 18 eggs
- Ages 36 to 40: 8 to 12 eggs
- Ages 41 and older: 5 to 10 eggs
Women with polycystic ovary syndrome (PCOS) sometimes produce 40 or more eggs in a single cycle because of their higher number of follicles. On the other end, most doctors won’t proceed with a retrieval cycle if they expect fewer than two eggs. Keep in mind that the number retrieved is not the number that will be fertilized. Having around 10 to 12 mature eggs after retrieval is a solid starting point, giving a good statistical chance of ending up with at least one viable embryo.
Recovery After Retrieval
You’ll rest in the clinic’s recovery area for about an hour after the procedure while the sedation wears off. Someone will need to drive you home. Most women feel well enough to return to normal activities the next day, though some cramping, bloating, and light spotting are common for a few days.
For roughly a week afterward, there are a few restrictions to lower infection risk and protect your ovaries while they return to normal size. Avoid tampons, tub baths, swimming, hot tubs, and saunas. Showers are fine. Hold off on heavy lifting over 20 pounds, high-impact sports, and any new exercise programs. Sexual intercourse is allowed but may be uncomfortable for the first few days.
Risks and Complications
Egg retrieval is considered low-risk. The most common side effects are mild cramping and bloating that resolve within days. Serious complications are rare but can include bleeding, infection, or injury to surrounding structures.
The complication that gets the most attention is ovarian hyperstimulation syndrome, or OHSS. This happens when the ovaries overreact to stimulation medications, swell significantly, and leak fluid into the abdomen. Symptoms range from abdominal bloating and discomfort to, in severe cases, difficulty breathing and dangerous shifts in blood volume. Moderate to severe OHSS occurs in roughly 1% to 5% of IVF cycles. Younger women are more likely to develop it, though women over 40 who do develop severe OHSS face a higher risk of life-threatening complications. Modern protocols have made severe OHSS increasingly uncommon, partly through careful medication dosing and monitoring during the stimulation phase.
What Happens to the Eggs Next
Once the embryologist isolates the mature eggs, they’re either fertilized with sperm that same day (through conventional insemination or by injecting a single sperm directly into each egg) or frozen for future use. Fertilized eggs are monitored over the next five to six days as they develop into embryos. The strongest embryos are then either transferred to the uterus or frozen for a later transfer cycle. Your clinic will typically call or message you within a day of retrieval to let you know how many eggs were mature and how many fertilized successfully.