Egg retrieval is a short surgical procedure, usually lasting 15 to 30 minutes, where a doctor uses a needle guided by ultrasound to collect eggs directly from your ovaries. It’s the central step in IVF and egg freezing cycles, but the process actually begins about two weeks earlier with hormone medications that prepare your body to produce multiple mature eggs at once.
The Stimulation Phase
Your ovaries normally release one egg per menstrual cycle. To make a retrieval worthwhile, fertility doctors use injectable hormone medications called gonadotropins to stimulate multiple follicles (the fluid-filled sacs that each contain an egg) to grow at the same time. This stimulation phase lasts about 10 to 11 days on average, though it can range from 8 days to 13 or more depending on how your body responds.
During this window, you’ll visit the clinic every few days for blood draws and transvaginal ultrasounds. These monitoring appointments let your doctor track how many follicles are growing and how large they’re getting. Based on those results, your medication doses may be adjusted up or down. The goal is to grow as many mature follicles as possible without overstimulating your ovaries.
The Trigger Shot
Once your follicles reach the right size, you’ll take a precisely timed “trigger shot,” a hormone injection that signals your eggs to complete their final stage of maturation. The retrieval is then scheduled for approximately 36 hours later. This timing is critical: the trigger sets off the process that loosens eggs from the follicle walls, but if you wait too long, your body will ovulate and release the eggs on its own, making them impossible to collect. Most clinics schedule retrievals down to the hour to stay within this window.
What Happens During the Procedure
On the day of retrieval, you’ll change into a gown and receive sedation, typically through an IV. Most patients are in a light sleep or “twilight” state and don’t feel pain during the procedure.
The doctor inserts an ultrasound probe into the vagina to visualize the ovaries and follicles on a screen. A thin needle attached to a suction device is then guided through the vaginal wall and into each follicle, one at a time. The fluid inside each follicle is gently aspirated through the needle, and an embryologist working nearby immediately examines the fluid under a microscope to confirm whether it contains an egg. This process is repeated for every accessible follicle on both ovaries. The whole procedure typically wraps up in under 30 minutes.
How Many Eggs to Expect
The number of eggs collected varies significantly by age, since both egg quantity and quality decline over time. Women between 20 and 30 typically yield 15 to 20 eggs per cycle. Between 31 and 35, that range drops to roughly 12 to 18. For those 36 to 40, the average falls to 8 to 12 eggs, and after 41, most retrievals produce 5 to 10.
Not every egg retrieved will be mature, and not every mature egg will fertilize successfully. Your clinic will give you a breakdown, usually the day after retrieval, telling you how many eggs were mature and how many fertilized. These numbers narrow at each step, which is why doctors aim to retrieve as many eggs as they can.
Recovery After Retrieval
You’ll spend about 30 to 60 minutes in a recovery area as the sedation wears off. Someone else will need to drive you home. Most people take the day of retrieval off from work and feel well enough to return to light activities within a day or two.
The most common side effects in the days following retrieval are bloating from enlarged ovaries, mild cramping or lower abdominal tenderness, light vaginal spotting from where the needle passed through the vaginal wall, and fatigue from both the sedation and the cumulative hormonal stress on your body. Some people also experience nausea or dizziness related to the anesthesia. These symptoms typically subside within 3 to 5 days, and most people feel fully back to normal by the time their next period arrives, usually 7 to 10 days after retrieval.
Doctors generally recommend avoiding strenuous exercise and heavy lifting for at least a week. Your ovaries are still swollen from the stimulation medications, and vigorous activity increases the risk of ovarian torsion, where an enlarged ovary twists on itself.
Risks to Be Aware Of
Egg retrieval is considered a low-risk procedure, but complications can occur. The most significant is ovarian hyperstimulation syndrome (OHSS), where the ovaries overreact to the stimulation medications and swell dramatically, causing fluid to leak into the abdomen. Symptoms include significant abdominal bloating and pain, difficulty breathing, and rapid weight gain from fluid retention. Moderate to severe OHSS occurs in roughly 1% to 5% of IVF cycles. Mild cases resolve on their own with rest and fluids, while severe cases can require hospitalization.
Other rare risks include infection, bleeding from the needle puncture site, or accidental injury to nearby structures like the bladder or bowel. Your clinic will explain specific warning signs to watch for, such as a fever, heavy bleeding, or pain that worsens instead of improving over the first few days.