Surrogacy is often talked about in emotional or legal terms, but in the clinic it is an intensive medical journey that unfolds over months. When people ask “how is surrogacy done?” or “how does surrogacy work?”, what they usually want is a clear walk-through of what actually happens to the bodies involved: intended mother surrogacy success rate in Delhi or egg donor, sperm provider, and the surrogate.
As someone who has sat with couples in waiting rooms, talked through consent forms with surrogates, and watched embryologists at work under the microscope, I can tell you that the science is impressive but also very human. It is a series of many small, careful steps rather than one miracle moment.
This guide focuses on how surrogacy works medically, with special attention to gestational surrogacy in India, where the law has changed significantly over the last few years.
First, what exactly is surrogacy?
Medically, surrogacy is a form of assisted reproduction where a woman agrees to carry a pregnancy for another person or couple, called the intended parent or intended parents.
Two main types matter clinically:
Traditional surrogacy: The surrogate’s own egg is used, usually via artificial insemination. She is both the genetic and gestational mother. This method is now very rare and largely prohibited in India because it creates complex legal and emotional issues.
Gestational surrogacy: The surrogate carries an embryo created from someone else’s egg and sperm. She has no genetic link to the baby. This is the form almost all clinics use, and it is the only type permitted under current surrogacy laws in India.
So when people ask how surrogacy work medically in India, they are really asking how gestational surrogacy is done: IVF, embryo creation in a lab, followed by transfer to the surrogate’s uterus, and then standard pregnancy care with some extra oversight.
The legal frame in India: why it matters medically
Before stepping into the details of injections, scans, and embryo transfers, you have to understand the legal backdrop. In India, medicine and law sit very close together in this area.
India used to be a major global destination for commercial surrogacy. Over time, concerns grew about exploitation, poor follow-up care, and unclear parentage. In response, the government passed the Surrogacy (Regulation) Act, often referred to informally as the surrogacy regulation bill, along with the Assisted Reproductive Technology (ART) Act.
Key points that shape how surrogacy in India is done today:
- Only altruistic surrogacy in India is allowed. That means no commercial payment to the surrogate, beyond medical expenses and defined insurance coverage. Clinics must document that no illegal compensation is involved. Only Indian heterosexual married couples, who meet specific age and infertility criteria, are typically eligible. The law is quite strict and has been criticised for being too narrow, but this is the practical reality most clinics operate within. There have also been updates and court challenges, so couples must check the latest rules with a lawyer or an experienced fertility centre. Surrogates must be Indian citizens, married, and have at least one living child of their own, within a set age range. A woman can only be a surrogate once in her lifetime under the current framework. The procedure must occur in registered ART and surrogacy clinics, with records maintained and approvals taken from appropriate authorities.
These surrogacy laws in India directly influence the medical pathway. The clinic cannot simply match you with any surrogate; it has to follow eligibility, screening, and documentation rules. If someone searches “surrogate in India” expecting a quick, transactional process, they are usually surprised at how regulated and formal it now is.
Matching and medical screening: setting the stage
The medical process starts long before anyone lies on an operating table.
Assessment of intended parents
For the intended mother (if she is providing eggs), the clinic evaluates:
- Ovarian reserve: blood tests like AMH and baseline FSH, and an ultrasound to count antral follicles. General health: thyroid, blood sugar, infection screening, and sometimes cardiac evaluation if there is a risk history. Uterine status: even if she will not carry the pregnancy, the uterus might be evaluated if there is any thought of self-carrying in future.
If donor eggs are needed, that becomes a separate pathway, but the core IVF steps in the lab remain similar.
For the sperm provider, usually the intended father, the basic work is a semen analysis, infectious disease screening, and a medical history review. In cases of severe male factor infertility, additional procedures like testicular sperm extraction might be required.
Screening of the surrogate
For gestational surrogacy in India, the surrogate’s medical evaluation is detailed and conservative. She is not just being checked for fertility, but also for her ability to tolerate an IVF pregnancy that is, by definition, higher risk than a spontaneous one.
Typically, doctors look at:
- Obstetric history: at least one previous uncomplicated live birth, no significant pregnancy complications like severe preeclampsia or postpartum haemorrhage. Uterine health: a transvaginal ultrasound, sometimes hysteroscopy or saline sonography, to look for fibroids, adhesions, or polyps. General health: blood pressure, diabetes risk, anaemia, kidney and liver function, as well as infectious screenings like HIV, hepatitis B and C, syphilis, and sometimes TORCH. Psychological readiness: often a counselling session, funneled through the legal requirement that she understands the implications and is not being coerced.
Only after both parties are cleared medically and legally do clinics move forward. This can take 1 to 3 months, depending on how quickly investigations are done and approvals obtained.
Step by step: how is surrogacy done medically?
Every clinic has its own fine-tuned protocol, but the logic is similar everywhere. In most gestational surrogacy cases, three bodies are involved in the medical choreography: egg source, sperm source, and surrogate.
Here is the basic medical flow most centres in India follow:
Cycle preparation and hormonal coordination Ovarian stimulation and egg retrieval Fertilization and embryo culture in the lab Preparation of the surrogate’s uterus Embryo transfer Pregnancy confirmation and monitoring Birth and postpartum careLet us walk through each of these with the practical detail that intended parents rarely get during their rushed clinic visits.
Coordinating cycles and hormones
When people imagine “how does surrogacy work”, they often imagine everything happening in one neat month. In reality, synchronising the biology can be the trickiest part.
The goal is simple: have a good quality embryo ready at the same time that the surrogate’s uterine lining is optimally receptive. There are two broad strategies.
Fresh embryo transfer cycle
In a fresh cycle, the egg retrieval and the embryo transfer happen within the same menstrual cycle. Hormones are used to stimulate the egg provider’s ovaries, and the surrogate’s cycle is manipulated so that her uterus is ready around day 5 after fertilization.
Fresh transfers require tight coordination. If the intended mother develops ovarian hyperstimulation risk or if there is a lab delay, the plan can collapse and turn into a frozen cycle.
Frozen embryo transfer cycle
Many clinics in India, especially for surrogacy, now prefer creating embryos first, freezing them, and doing the surrogate’s preparation later as a separate cycle. This approach:
- Reduces pressure to align two cycles perfectly. Gives time for genetic testing of embryos if indicated and permitted. Allows doctors to optimise the surrogate’s health before transfer.
The medical steps are the same, but stretched over two different time frames.
Ovarian stimulation and egg retrieval
If you have ever seen an IVF injection schedule, you know it is not just “a few shots”. For surrogacy, the egg provider goes through a standard IVF stimulation cycle.
Most protocols look like this:
The intended mother starts daily hormonal injections, usually gonadotropins, for around 8 to 12 days. These injections stimulate multiple follicles to grow, each ideally containing one egg. Ultrasound scans and blood tests happen every 2 to 3 days to monitor growth. When enough follicles reach the target size, a trigger injection is given to mature the eggs. About 34 to 36 hours later, the egg retrieval procedure is scheduled.
Egg retrieval is done with the patient under light anesthesia. A needle attached to a vaginal ultrasound probe passes through the vaginal wall into each ovary, aspirating fluid from the follicles. The procedure usually takes 15 to 30 minutes. Most women go home the same day with mild cramps and bloating.
In surrogacy, the surrogate is not present for any of this. Her part comes later.
Fertilization and embryo culture
Once the eggs reach the lab, the embryology team steps in. This is where the most “invisible” but crucial part of how surrogacy works medically takes place.
Here is a typical lab scene:
The retrieved follicular fluid is examined under a microscope to locate eggs. Each mature egg is placed in a tiny drop of specialized culture media. Sperm is prepared - washed and processed to select the healthiest, most active ones. Fertilization is attempted, either by conventional IVF (eggs and sperm are placed together) or by ICSI, where a single sperm is injected directly into each mature egg using a fine glass needle.
These fertilized eggs, now called zygotes, are cultured in incubators that tightly control temperature, pH, and gas composition. Over the next 3 to 5 days, they divide into multicellular embryos and later into blastocysts.
Embryologists grade embryos based on appearance, cell number, symmetry, and other features. Not every fertilized egg becomes a transferable embryo. In many real-world cases, you might start with 10 to 12 eggs and end up with 2 to 4 good quality blastocysts.
If preimplantation genetic testing is being done and is legally permitted, a few cells are biopsied from the embryo and sent for analysis, while the embryos are frozen. Otherwise, embryos might go straight to transfer or be frozen for later use.
Preparing the surrogate’s uterus
While the lab works with embryos, the surrogate’s body is turned into the most hospitable environment possible.
There are two broad types of cycles used for surrogates in India:
Hormone replacement therapy cycle
The surrogate’s natural cycle is suppressed with medications. Then she takes estrogen tablets or patches for about 10 to 14 days to build her uterine lining. Once the lining reaches at least 7 to 8 mm thickness with a good pattern on ultrasound, progesterone is added, usually by injection, vaginal gel, or tablets. Embryo transfer is scheduled after a set number of days of progesterone, so that the lining and embryo development are in sync.
Modified natural cycle
In some cases, especially if the surrogate has very regular cycles and there are reasons to avoid heavy hormones, doctors might track her natural ovulation and time the embryo transfer around that. Progesterone support is usually still given.
Most surrogates describe this period as the most demanding medically, because they are travelling to the clinic frequently for ultrasounds and taking multiple medications daily. Side effects are usually manageable - nausea, breast tenderness, mood fluctuations - but sometimes women experience significant bloating and fatigue.
Embryo transfer: the quiet key moment
If you walk past an IVF theatre on embryo transfer day, you might be surprised by how ordinary it looks. No big machines, no major surgery. Yet this is the moment that everyone has been moving toward for weeks.
Embryo transfer is typically a short, painless procedure:
The surrogate is asked to come with a moderately full bladder. After changing into a gown and signing consent forms, she lies on a procedure table. A speculum is inserted to visualise the cervix, similar to a Pap smear. The doctor gently passes a thin, soft catheter through the cervix into the uterine cavity under ultrasound guidance. In the lab next door, the embryologist loads the selected embryo or embryos into a tiny drop of media inside the catheter. The catheter is handed to the doctor, who slowly injects the contents into the uterus while watching the placement on the ultrasound.
Most clinics in India transfer a single embryo nowadays, especially in surrogacy cases, to reduce the risk of twins and associated pregnancy complications. Some centres may still consider double embryo transfer in specific situations, but regulations and best practices are increasingly nudging toward single transfers.
After the transfer, the surrogate usually rests in the clinic for 20 to 30 minutes, then goes home. Absolute bed rest is not required, despite what relatives often insist. Gentle activity is fine, and heavy lifting or intense exercise is avoided.
The two-week wait and pregnancy testing
From the surrogate’s perspective, the next 10 to 14 days can feel longer than the entire IVF process.
Progesterone and sometimes estrogen support continues throughout this period. Many clinics also prescribe low-dose aspirin or heparin injections if there are clotting concerns, though this is not universal and must be individualized.
Around 10 to 14 days after embryo transfer, a blood test for beta hCG is done. If positive and rising appropriately, an early pregnancy ultrasound is scheduled around 6 to 7 weeks gestation to confirm:
- Presence of a gestational sac Fetal pole and heartbeat Location of the pregnancy inside the uterus, not in the tube
It is at this point that everyone relaxes a tiny bit. Before that scan, even a positive blood test is treated with caution.
This is also the point where the relationship between clinic, surrogate, and intended parents needs careful management. Intended parents are usually anxious for updates, while surrogates may feel physically and emotionally vulnerable. Clear communication protocols set upfront help a lot.
Pregnancy management in surrogacy: what is different?
Once the pregnancy is confirmed, most people assume it is “just a normal pregnancy”. Biologically, many parts are indeed the same: morning sickness, scans, glucose testing, third trimester discomfort.
Yet surrogacy pregnancies are medically labelled high risk for a few reasons:
- IVF and embryo transfer pregnancies have a slightly higher baseline risk of complications such as preeclampsia, gestational diabetes, and placental issues, compared to spontaneous conceptions. Surrogates are often slightly older than typical first-time mothers, because they must already have at least one child. Emotional stress is higher, which can indirectly affect sleep, diet, and blood pressure.
In India, the surrogacy process in India during pregnancy usually includes:
- More frequent antenatal visits, especially during the first and last trimesters. Standard antenatal scans: dating scan, nuchal translucency, anomaly scan at around 18 to 20 weeks, growth scans in the third trimester. Blood tests for anaemia, thyroid function, and glucose tolerance. Regular blood pressure checks and urine tests for protein.
Most clinics formalise how updates are shared with intended parents. Some invite them to key scans, if the surrogate and all parties are comfortable. Others share reports via the clinic coordinator. Everything must respect the surrogate’s privacy and medical autonomy while honouring the intended parents’ legitimate interest.
Delivery planning often includes a detailed discussion around 32 to 34 weeks about:
- Mode of delivery: vaginal birth is possible and often preferred if there is no obstetric contraindication, but many centres see higher rates of caesarean section in surrogacy due to perceived medico-legal safety. Hospital location: some couples want a tertiary care centre with NICU facilities in case of prematurity. Presence at birth: intended parents may wish to be nearby or in the waiting area. Local hospital policies and legal documents determine who is allowed in the labour room or operating theatre.
After birth: medical and practical steps
The moment the baby is born is emotionally charged, but there are also precise medical and legal steps that need attention in India.
Medically, the surrogate’s postpartum care is similar to any new mother’s physically, but without a baby to breastfeed and hold, her hormonal and emotional landscape can look different. Many surrogates experience a complex mix of relief, sadness, pride, and fatigue. Access to counselling, clear follow-up visits, and continued health monitoring are vital but often under-discussed.
For the baby, routine newborn checks are done, and paediatricians keep a close eye, especially if the pregnancy involved IVF-related risks or preterm birth. If the intended parents wish, some surrogates may be willing to provide colostrum or breastmilk through pumping, but this must be mutually agreed and ethically managed.
From a paperwork perspective, surrogacy in India involves registration of birth certificates with the intended parents as legal parents, based on prior court orders and documentation arranged during the pregnancy. The exact sequence can vary by state, and clinics usually work with local legal experts.
Trade-offs, edge cases, and common misconceptions
Any honest discussion of how surrogacy works should address the messy bits too.
One frequent misconception is that surrogacy guarantees a baby. Medically, it does not. Success rates depend on age and egg quality, sperm parameters, embryo quality, and uterine receptivity. For couples using their own eggs and sperm, typical success per embryo transfer might range from 30 to 60 percent, depending on age and clinic expertise. Several attempts may be needed, and sometimes no viable embryos are produced despite a full IVF cycle.
Another misconception is that the surrogate carries no risk. In reality, she faces all the typical pregnancy risks, plus IVF-related ones like multiple pregnancies if more than one embryo is transferred. That is why gestational surrogacy in India is restricted to women who have already had a safe delivery and who pass detailed medical screening.
There are also edge cases that clinics have to navigate:
- What if the surrogate develops a serious complication like preeclampsia requiring early delivery? What if prenatal testing reveals a major fetal abnormality? What if relationships between the parties break down mid-pregnancy?
These are not just legal questions. They are intensely medical, because they involve decisions about treatment, pregnancy continuation, and sometimes termination. A good surrogacy program will have written protocols, ethics committee oversight, and pre-signed agreements, but in the real world, each case still needs nuanced, case-by-case judgment.
How to choose a clinic for surrogacy in India
If you are considering surrogacy in India, the way the clinic approaches medical care tells you a lot about their ethics. A brief checklist many families find useful:
- Ask who coordinates the care: Is there a dedicated surrogacy coordinator who knows both the intended parents and the surrogate, or is it all handled ad hoc at the reception desk? Ask about success rates specific to your age and diagnosis, not just headline numbers. Ask how many surrogacy cases the clinic handles per year and whether they are registered under both the ART and surrogacy regulation frameworks. Ask to meet the obstetrician who will likely manage the surrogate’s pregnancy and not just the IVF specialist. Ask how they handle communication and emergencies: Who calls whom, at what stage, and how often?
Listening carefully to the answers to these simple questions usually reveals whether the centre truly understands the medical, emotional, and legal layers of the process, or is just using “surrogate in India” as a marketing keyword.
Bringing it together
Medically, surrogacy is IVF plus high-touch pregnancy care, with the twist that the genetic and gestational roles are separated. When you strip away the anxieties about law and society, what happens in the clinic is structured, methodical, and very much rooted in established reproductive medicine.
For anyone trying to understand how surrogacy work in practice:
- Eggs and sperm are collected, often through standard IVF and ICSI. Embryos are created and carefully cultured in the lab. A rigorously screened surrogate’s uterus is prepared hormonally. One or occasionally more embryos are transferred into her womb. If implantation occurs, the pregnancy is monitored closely until a baby is delivered into the arms of the intended parents.
In India, every one of these steps sits under the umbrella of the surrogacy regulation bill and related ART laws, which is why it is so important to work with registered clinics and legal professionals who live and breathe this space.
Understanding the medical side does not remove the emotional complexity, but it does give you firmer ground to stand on. Whether you are a couple weighing options, a potential surrogate, or a family member trying to support someone, knowing the real sequence of events makes the journey feel less mysterious and more manageable.