At a glance
Embryo freezing is a fertility procedure in which one or more embryos created through in vitro fertilisation (IVF) are preserved at very low temperatures so they can be used in a future pregnancy attempt.
After eggs are fertilised in a laboratory, the resulting embryos are cooled to around minus 196 degrees Celsius using a technique called vitrification (ultra-rapid freezing). At that temperature, all biological activity stops and the embryos can be stored for years without deteriorating. When a transfer is planned, the embryos are carefully warmed and placed into the uterus.
Medical Condition
Embryo freezing is used whenever a person or couple wants to preserve embryos for later use, whether that is weeks, months, or years away. Doctors recommend it for a wide range of medical and personal reasons.
- Surplus embryos from an IVF cycle that are not transferred in the fresh attempt.
- Cancer treatment planned before chemotherapy or radiation that may damage fertility.
- Medical conditions such as endometriosis or premature ovarian insufficiency (early loss of normal ovarian function) that are likely to worsen over time.
- Risk of ovarian hyperstimulation syndrome (OHSS), a reaction to fertility drugs that makes an immediate transfer unsafe.
- Genetic testing of embryos (PGT) required before transfer, which takes time.
- Uterine lining not ready at the time of egg retrieval, so transfer is postponed.
- Single people or couples who want to delay parenthood for personal or professional reasons.
Embryo freezing is not suitable in every situation. A fertility specialist will advise against it when there is no usable embryo to freeze, or when the quality of embryos after fertilisation is too poor to survive the freezing and thawing process reliably.
- No embryos reached the appropriate stage of development after fertilisation.
- All available embryos are being transferred fresh and none are left over.
- Certain genetic or chromosomal results from testing make storage inadvisable.
- Facility does not meet the required storage and quality-control standards.
Risks & Complications
The freezing process itself carries minimal direct risk to the patient, but there are recognised risks associated with the broader IVF process and with embryo survival during freezing and thawing.
- Not all embryos survive the freeze-thaw cycle, which may mean fewer embryos are available for transfer than expected.
- Ovarian hyperstimulation syndrome (OHSS) from the hormone injections used to produce eggs, ranging from mild bloating to, rarely, a more serious reaction requiring medical attention.
- Discomfort, bruising, or minor bleeding at the injection sites during the stimulation phase.
- Pelvic discomfort or light bleeding after the egg retrieval procedure.
- Small risk of infection after egg retrieval.
- Emotional and psychological stress related to uncertainty about embryo quality or future transfer outcomes.
- In very rare cases, equipment or storage failure, though reputable clinics have strict backup protocols.
Preparation & Procedure
Preparation for embryo freezing begins well before the egg retrieval, because the ovaries need to be stimulated to produce multiple eggs. This phase typically takes around ten to fourteen days and involves daily hormone injections, though the exact schedule varies by clinic and individual response.
Before stimulation starts, most clinics ask patients to stop certain medications that could interfere with hormone levels, including some supplements and blood thinners. Smoking is discouraged throughout, as it can reduce egg quality. Alcohol is usually asked to be avoided from the start of the cycle. Your doctor will give specific guidance based on your medications and history.
Standard tests done before or early in the cycle typically include a blood hormone panel to assess ovarian reserve (the number of eggs remaining), an ultrasound of the ovaries, an assessment of the uterine cavity, and infectious disease screening. Some clinics also request a semen analysis if a partner's sperm is being used.
On the day of egg retrieval, fasting is usually required for several hours beforehand because sedation or light anaesthesia is given. The steps of the full process run roughly as follows.
- Daily hormone injections are given at home or at the clinic to stimulate the ovaries to produce multiple eggs.
- Regular ultrasound scans and blood tests monitor how the follicles (fluid-filled sacs containing eggs) are growing.
- A trigger injection is given at a precisely timed moment to mature the eggs.
- Around 36 hours after the trigger, eggs are retrieved through a needle guided by ultrasound, under sedation. The procedure usually takes 15 to 30 minutes.
- Retrieved eggs are fertilised in the laboratory using the partner's or donor's sperm.
- Embryos are monitored over several days as they develop, usually to the blastocyst (day-five embryo) stage.
- Embryos suitable for storage are loaded into thin straws and plunged into liquid nitrogen through vitrification.
- Frozen embryos are labelled and placed in long-term storage tanks at the clinic.
Aftercare
Recovery from the egg retrieval part of the process is usually short. Most patients rest for a few hours at the clinic and go home the same day, though some pelvic soreness and bloating can continue for a day or two. The embryos themselves are in storage, so there is no physical recovery linked to that step.
- Rest at the clinic for one to several hours after egg retrieval, then discharge when stable.
- Expect mild cramping and bloating for one to three days after retrieval; this usually resolves on its own.
- Avoid strenuous exercise and heavy lifting for a few days after retrieval.
- Most people return to desk work within one to two days, though this varies.
- The clinic will contact you with a report on how many embryos were frozen and their grading.
- A follow-up consultation is scheduled to discuss results and plan the frozen embryo transfer (FET) when the time comes.
- Annual contact with the clinic is usual to confirm continued storage and renew consent.
- When a transfer is planned, a separate preparation process begins, usually involving hormone treatment to prepare the uterine lining.
Cost & What Determines It
The cost of embryo freezing varies widely depending on where it is done, how the body responds to stimulation, and how many treatment cycles are needed. A single quoted price rarely tells the full story because the procedure has many moving parts.
- Country and hospital class: private fertility clinics in medical travel destinations set prices differently from hospitals in Indonesia or in Western countries.
- Number of stimulation cycles: some patients need more than one cycle to obtain a suitable number of embryos.
- Ovarian response: a poor response may require higher doses of stimulation medication or additional monitoring visits, adding to the total.
- Laboratory fees: the cost of embryologist time, fertilisation, embryo culture, and the vitrification process itself.
- Genetic testing (PGT): if embryos are screened for chromosomal abnormalities before freezing, this adds a significant cost.
- Number of embryos stored: some clinics charge a flat fee; others charge per embryo or per straw.
- Annual storage fees: ongoing yearly charges for keeping embryos in liquid nitrogen tanks.
- Anaesthesia fees for the egg retrieval procedure.
- Pre-cycle tests: hormone panels, ultrasound, infectious disease screening, and semen analysis.
Hospital packages usually cover the stimulation monitoring appointments, egg retrieval procedure, laboratory fertilisation, and the first year of storage. Items commonly billed separately include the stimulation medications themselves (which can be a large portion of the total), genetic testing, long-term annual storage renewals, and the frozen embryo transfer cycle when it eventually takes place.
BPJS Kesehatan does not cover IVF or embryo freezing, and most Indonesian private health insurance plans also exclude fertility treatments. Patients who travel abroad for this procedure typically pay out of pocket or through private international insurance that explicitly includes fertility benefits. Before booking, ask the clinic for a written itemised cost estimate that separates the procedure fee from medications, storage, and any optional add-ons so there are no unexpected bills after arrival.
Frequently Asked Questions
How many sessions does embryo freezing take?
Embryo freezing is not a standalone session but the final step of an IVF cycle, so the number of appointments depends on how the full cycle goes. Most patients have daily hormone injections for about 10 to 14 days to stimulate the ovaries, followed by an egg collection procedure, fertilisation in the lab, and then freezing of any suitable embryos. Your doctor will adjust the timeline based on how your body responds to the hormone stimulation.
How does embryo freezing feel, and is the process painful?
The freezing step itself is done entirely in the laboratory, so you feel nothing during that part. The part that can be uncomfortable is the egg collection procedure, which is usually done under sedation (a light sleep) or local anaesthesia so most patients feel little to no pain during it. Some cramping and bloating in the days after egg collection are common, and your care team will recommend pain relief if needed.
How soon can a frozen embryo be used after freezing?
Embryos can be stored for an extended period and used whenever you and your doctor decide the time is right. Many patients freeze embryos now and return for a transfer months or even years later, depending on their personal plans and medical situation. Before a transfer is scheduled, your doctor will assess your uterine lining and overall health to choose the best timing.
How much does embryo freezing cost?
The cost varies based on several factors specific to your situation, including the number of IVF stimulation cycles needed, the number of embryos frozen, the laboratory techniques used (such as vitrification, a rapid-freeze method), and the annual storage fees charged by the facility. A written cost estimate from the hospital or clinic is the most reliable way to understand what you will actually pay.
This page is general information, not a substitute for medical advice. Every case is different. Your doctor decides what is right for you.
