The Zygi blog

What Is a Surrogate Carrier? A Practical Guide for Intended Parents and Surrogates

May 21, 2026

Illustration of a pregnant surrogate at a doctor's office

What gestational surrogacy actually is, who uses it, and how the process works, for intended parents and surrogate carriers alike.

What Is a Surrogate Carrier?

A surrogate carrier — also called a gestational carrier — is a person who carries a pregnancy for intended parents using an embryo that is not genetically related to them. The embryo is created through IVF using eggs and sperm from the intended parents and/or donors, transferred into the surrogate's uterus, and carried to term on behalf of the family who will raise the child.

That two-sentence definition matters because it draws the clearest possible line between gestational surrogacy and what most people picture when they hear the word "surrogate" — which is usually something closer to traditional surrogacy, a much older and now largely obsolete arrangement. Understanding the difference is the first thing anyone stepping into this world needs to get right.

Gestational Surrogacy vs. Traditional Surrogacy: What's the Difference?

The terms are often used interchangeably in casual conversation, but they describe fundamentally different arrangements with very different legal and emotional implications.

Gestational surrogacy is what virtually all modern surrogacy arrangements are. The surrogate carrier has no genetic connection to the baby. The embryo is created via IVF — using eggs from the intended mother or an egg donor, and sperm from the intended father or a sperm donor — and transferred into the surrogate's uterus.

Traditional surrogacy uses the surrogate's own egg, meaning she is also the biological mother of the child. This creates significant legal complexity (in many states she has parental rights that are difficult to terminate), emotional complexity, and ethical concerns. Most reputable surrogacy agencies and fertility clinics in the United States no longer facilitate traditional surrogacy arrangements.

When you see the word "surrogate" used today — in a clinic, an agency, a legal contract, or a community like Zygi — it almost certainly means gestational surrogacy. We'll use the terms interchangeably from here.

Who Uses Gestational Surrogacy?

Surrogacy is used by a wide range of people — and the picture of who pursues it has expanded significantly in recent years. Some of the most common situations:

Intended parents with a uterine factor

Some people cannot carry a pregnancy due to the absence of a uterus (whether from birth, surgery, or other medical reasons), a uterine condition like severe Asherman's syndrome, or repeated unexplained implantation failures. For these intended parents, surrogacy is a medical necessity, not a preference.

Gay male couples and single men

For gay male couples and single men building families, gestational surrogacy — combined with an egg donor — is the primary path to a genetically related child. This is one of the fastest-growing populations using surrogacy, and the legal landscape in many U.S. states has evolved significantly to protect these families.

Intended parents with health conditions affecting pregnancy

Serious cardiac conditions, certain cancers and their treatments, autoimmune diseases, and other health factors can make pregnancy life-threatening for the intended mother. Surrogacy allows these parents to have a genetically related child without the risk.

Same-sex female couples

While many same-sex female couples use reciprocal IVF (one partner provides the eggs, the other carries the pregnancy), some situations require a surrogate — for example, if neither partner can safely carry, or if one partner's eggs are used with a donor and neither partner wants to carry.

Single women and other intended parents

Single women who cannot carry for medical reasons, and intended parents in a range of other circumstances, also pursue gestational surrogacy. The field has become far more inclusive than it was even a decade ago.

One thing worth naming: surrogacy is not a "shortcut" or a way to avoid the discomforts of pregnancy. The people who choose it almost always do so because they have no other path — or because they've already tried and failed other paths. That context matters, both for intended parents processing their own story, and for surrogates who want to understand why this work is so meaningful.

Who Becomes a Surrogate Carrier — and Why?

Surrogate carriers are typically women between the ages of 21 and 40 who have already had at least one successful, uncomplicated pregnancy and delivery of their own. They're screened extensively — medically, psychologically, and financially — before being approved to carry.

Basic eligibility requirements (U.S. standard)

At least one prior successful pregnancy and birth
Age 21–40 (some agencies and clinics allow up to 43 with good medical history)
BMI within the clinic's acceptable range (typically under 32–35)
Non-smoker; no illicit drug use
No major untreated mental health conditions
Financially stable (not receiving public assistance — a standard that varies by state)
Supportive home environment and partner consent (if applicable)
Willing to follow medical protocols and comply with the surrogacy agreement

Beyond the logistics, surrogates are often motivated by a genuine desire to help others build families — many describe it as the most meaningful thing they've done. It's worth noting that compensation is real (more on that below), but agencies screen for surrogates whose primary motivation is altruistic. Someone pursuing surrogacy purely for the money is generally considered a poor psychological fit.

What surrogates are compensated for

In the United States, gestational surrogacy is typically a compensated arrangement (unlike Canada and the UK, where only expenses can be reimbursed). Base compensation varies widely by state, agency, and surrogate experience — ranging roughly from $35,000 to $60,000 or more for a first-time surrogate, plus allowances for maternity clothing, travel, childcare during appointments, lost wages, and medical expenses not covered by insurance.

This is not the surrogate "selling a baby" — a misconception worth addressing head-on. The surrogate is compensated for her time, discomfort, medical risk, and the significant life disruption that carrying a pregnancy involves. She has no legal claim to the child, and the intended parents have no claim to her. The American Society for Reproductive Medicine (ASRM) and most reproductive law experts view compensated surrogacy as ethically sound when conducted with proper screening, legal protections, and informed consent.

How Does Gestational Surrogacy Actually Work? A Step-by-Step Overview

Step 1: Medical workup and embryo creation

Before any surrogate is involved, the intended parents typically go through IVF to create embryos. This involves ovarian stimulation and egg retrieval from the intended mother or egg donor, fertilization with the intended father's or donor's sperm, and embryo development and (usually) genetic testing via PGT. The resulting embryos are frozen while the surrogacy process is arranged.

Step 2: Finding a surrogate — agency or independent

Most intended parents work with a surrogacy agency to find and vet a surrogate. Agencies handle initial screening, matching, coordination, and ongoing support throughout the journey. They're not cheap — agency fees typically run $20,000–$50,000 on top of medical and legal costs — but they provide significant infrastructure and risk mitigation.

Some intended parents pursue independent surrogacy — finding a surrogate through personal networks or matching platforms without an agency. This reduces costs but places more coordination and legal responsibility on the parties directly. It's viable, but requires a very good reproductive attorney and a high level of trust and organization.

Step 3: Legal contracts

Before any medical procedures involving the surrogate, a legally binding gestational carrier agreement (GCA) must be in place. This contract covers compensation, medical decisions, selective reduction and termination clauses, what happens in the event of multiples, life insurance, and dozens of other contingencies. Both parties must have independent legal representation — the intended parents' attorney and the surrogate's attorney cannot be the same person.

A pre-birth order (PBO) — a court order issued before the baby is born establishing the intended parents as the legal parents — is the gold standard. The availability of PBOs varies by state. RESOLVE: The National Infertility Association maintains resources on the legal landscape by state.

Step 4: Surrogate medical workup and cycle sync

Once matched and legally cleared, the surrogate goes through her own medical workup — uterine evaluation, infectious disease screening, psychological evaluation — at the intended parents' clinic. If everything clears, her cycle is synced with the embryo transfer protocol using medications (estrogen to build the lining, then progesterone to prepare for implantation).

Step 5: Embryo transfer and pregnancy

The frozen embryo transfer (FET) is typically a simple outpatient procedure — no sedation, 15–30 minutes, similar to a Pap smear in terms of discomfort. A pregnancy test (beta HCG) is done 9–12 days later. If positive, the surrogate is monitored at the fertility clinic for the first 8–10 weeks, then transferred to her own OB for the remainder of the pregnancy.

Step 6: Birth and legal handover

The surrogate delivers at a hospital agreed upon in the contract. With a pre-birth order in place, the intended parents are named on the birth certificate from the start. The surrogate is discharged as a patient; the intended parents take the baby home. In states without PBOs, a post-birth adoption step may be required.

The relationship between intended parents and surrogate during the pregnancy varies enormously — from close and communicative to more formal and boundaried. There's no single right model. What matters is that expectations are aligned in the contract and in ongoing communication, and that both parties feel respected throughout.

The Legal Landscape: A State-by-State Overview

Surrogacy law in the United States is state-by-state — there is no federal law governing it. This is one of the most important practical considerations when choosing where to pursue surrogacy and where your surrogate lives.

Surrogacy-friendly (pre-birth orders available): California, Nevada, Washington, Maine, Connecticut, Colorado
- Pre-birth orders routine; strong legal protections for all parties
Generally permissive (case-by-case): Florida, Texas, Illinois, New York, New Jersey
- Varying levels of statutory support; consult a local RE attorney
Restrictive or legally unclear: Michigan, Louisiana, Nebraska
- Compensated surrogacy contracts may not be enforceable; proceed with caution
International considerations: Canada (altruistic only), UK (altruistic), most of Western Europe
- Compensated surrogacy typically illegal; legal parentage can be complex on return

This is a general overview — surrogacy law changes, and what's possible in a given state depends on specific facts and the judge assigned to your case. Always work with a reproductive attorney licensed in the state where your surrogate resides. The Academy of Adoption and Assisted Reproduction Attorneys (AAAA) and the Society for Assisted Reproductive Technology (SART) are good starting points for finding qualified counsel.

Common Misconceptions About Surrogacy

Here are the ones worth addressing directly.

"The surrogate is the baby's mother"

In gestational surrogacy, the surrogate has no genetic connection to the baby. She is the birth mother in a physiological sense, but she is not the legal or genetic mother. The intended parents — who contributed the egg, the sperm, or both — are the genetic and legal parents. Courts in surrogacy-friendly states recognize this explicitly.

"Surrogates can change their mind and keep the baby"

This is the most common fear among intended parents, and it's largely unfounded in gestational surrogacy. Because the surrogate has no genetic connection to the child, the legal framework is more straightforward than in adoption. With a pre-birth order in place and a properly executed contract, the surrogate has no legal claim to the child. The famous cases people cite — Baby M, for example — involved traditional surrogacy, which is a different arrangement entirely.

"Only wealthy people can use surrogacy"

The costs are real and significant — a full gestational surrogacy journey in the U.S. typically runs $120,000–$200,000 when you factor in IVF, agency fees, legal fees, surrogate compensation, insurance, and other costs. This is a serious barrier. But financing options exist, some employers offer fertility benefits that extend to surrogacy, and the legal and medical landscape is evolving. Organizations like

Men Having Babies and RESOLVE offer resources on financial assistance and grant programs.

"International surrogacy is a cheaper, easier option"

International surrogacy has significant legal and ethical risks. Many countries that were previously popular destinations — India, Thailand, Cambodia, Nepal — have banned commercial surrogacy for foreign nationals. Mexico and some other countries remain active, but the legal pathway to establish parentage back in your home country is not guaranteed. The U.S. is one of the most legally secure places in the world to pursue gestational surrogacy, even accounting for cost.

"Being a surrogate is risky and traumatic"

Carrying a pregnancy always involves risk — and surrogates should go in clear-eyed about that. But the medical risks of a surrogate pregnancy are the same as any pregnancy; there's no additional medical risk from the surrogacy arrangement itself. Most surrogates describe the experience as profoundly positive. Psychological screening and ongoing counseling (which reputable agencies require) significantly reduces the risk of emotional difficulty.

Frequently Asked Questions

What is the difference between a surrogate and a gestational carrier?

The terms are often used interchangeably. "Gestational carrier" is the more precise medical and legal term — it specifies that the carrier has no genetic connection to the child. "Surrogate" is the more common everyday term. When people say surrogate today, they almost always mean gestational carrier. Traditional surrogacy (where the surrogate uses her own eggs) is rare and largely obsolete.

How much does surrogacy cost in the United States?

Total costs vary significantly depending on where you live, which agency you use (or whether you go independent), your clinic's IVF success rates, and whether complications arise. A rough breakdown: IVF and FET ($20,000–$40,000+), agency fees ($20,000–$50,000), surrogate compensation and benefits ($50,000–$80,000), legal fees ($10,000–$20,000), insurance ($5,000–$20,000), and miscellaneous costs. Many families spend $120,000–$200,000 total. Some spend more, particularly with multiple transfer cycles. The Men Having Babies Cost Calculator is a useful starting point for building a realistic budget.

Can gay couples use a surrogate?

Yes — gestational surrogacy combined with donor eggs is the primary path to a genetically related child for gay male couples. One or both partners can contribute sperm; embryos can be created from each partner's sperm with the same donor's eggs if desired. Same-sex female couples can also use a surrogate if neither partner can carry. The legal landscape for LGBTQ+ intended parents has improved significantly, especially in surrogacy-friendly states.

Can a single person use a surrogate?

Yes. Single intended parents — both men and women — pursue surrogacy regularly. For single men, an egg donor is also needed. For single women who cannot carry, a surrogate carries the pregnancy using the intended mother's embryo (or a donor egg if needed). The legal process is the same as for couples.

How do intended parents find a surrogate?

Most work with a surrogacy agency, which handles screening, matching, and coordination. Agencies typically present intended parents with profiles of pre-screened surrogates, and both parties must agree to match before moving forward. Some intended parents find surrogates independently through personal networks or online matching communities — this reduces agency fees but requires more self-directed legal and medical coordination.

What does the surrogate's medical workup involve?

The surrogate's workup typically includes a full uterine evaluation (saline sonogram, mock embryo transfer, and sometimes an ERA), infectious disease screening, blood typing, a physical exam, and a psychological evaluation. It's conducted at the intended parents' fertility clinic. We cover the workup tests in detail in our IVF Workup Tests Explained post — much of that applies directly to surrogate screening as well.

Can a surrogate be related to the intended parents?

Yes — altruistic surrogacy by a family member (a sister, cousin, or other relative) is legal in most U.S. states and relatively common. Clinics and agencies typically require the same psychological evaluation and legal contracts as in any other arrangement, to ensure no undue pressure exists. Some intended parents prefer this arrangement; others prefer the clear emotional boundaries that come with working with someone outside the family.

Track Your Surrogacy Journey with Zygi

Whether you're an intended parent navigating IVF and surrogate matching simultaneously, or a surrogate carrier preparing for your first transfer cycle — Zygi has a dedicated tracker built for your specific path. Zygi is free, patient-side only, and shares nothing with your clinic or agency. It's built from firsthand experience with this process, and it's designed to help you stay oriented through one of the most complex and meaningful journeys a person can take.

Zygi supports two journey types: IVF only and IVF + surrogacy (for intended parents), and will soon support surrogate carriers as well. Start tracking for free at zygihealth.org.

Sources & Further Reading

This post is for informational purposes only and is not medical, legal, or financial advice.