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Process Guide

Whose Egg, Whose Sperm, Who Carries: What Each Choice Locks In

Whose egg, whose sperm and who carries are three separate decisions, and each one changes the medical steps, the contract and who decides.

Updated
Oct 14, 2026
First published
Oct 14, 2026
Reading time
7 min
By
SurrogacyBase Medical Editorial Team

Reviewed by the SurrogacyBase Medical Advisory Board.

A glass laboratory dish with tools resting in it on a pale stone surface

People usually arrive at surrogacy thinking it is one decision: whether to do it. In practice it is three, and they are separable. Whose egg. Whose sperm. Who carries the pregnancy. Each one has its own medical step, its own consent document, and its own set of questions that only a lawyer, a clinic or an escrow administrator can answer for your situation.

Each choice changes what has to be asked next: which questions you are actually creating, and who can answer them on your facts.

The words used here

Getting the vocabulary straight is worth five minutes, because providers use these terms loosely and a contract will use one of them precisely.

  • Gamete: an egg or sperm.
  • Donor: a person providing a gamete who is not intended to become a parent of the child.
  • Gestational carrier: a woman who carries a pregnancy to which she has made no genetic contribution. Some programs call her the surrogate and some the gestational carrier; this site uses “surrogate” except where that has to be distinguished from a traditional arrangement.
  • Traditional arrangement: the person who carries the pregnancy also provides the egg, so she is genetically related to the child.
  • Intended parents: the people planning to raise and to be recognised as the child’s parents.

The distinction that carries the most weight is whether the carrier is genetically related to the child. It changes which questions exist, not merely how difficult they are.

What each combination puts in motion

ArrangementWhat it settles for youWhat it adds to your list
Your egg, your sperm, a carrier with no genetic linkBoth genetic parents are youScreening and consent questions about the carrier; whether a genetic link is even useful where you are
Donor egg, your spermOne genetic link, from youWhere the egg came from, what screening applies, what you may ever know or tell the child
Your egg, donor spermOne genetic link, from youThe same record and disclosure questions, plus whether the donation was directed to you
Donor egg and donor spermNo genetic link to either intended parentWhether that changes anything about how the child is recognised, and who has to answer that
The carrier’s own eggShe is genetically related to the childA different and larger set of questions, described below

Read the middle column as a description of the arrangement, not as a legal outcome. Whether a genetic link helps, hurts or is irrelevant is a question about the place and your own status, and it belongs in the four legal questions to settle first.

The donor is not a footnote

A gamete from another person brings a set of arrangements with it, and they are usually held by a clinic or a bank rather than by the agency you are talking to.

Questions worth asking, and the party that normally owns each one:

  • Screening. What medical, genetic and infectious disease screening is performed, by whom, and to what standard. The clinic or the gamete provider answers this.
  • How widely that donor is used. Whether there is any limit on how many families one donor’s gametes are used for, and who tracks it. The provider answers; the register, if there is one, may not.
  • Anonymity, and whether it survives. Whether the donor is identifiable, whether the child could ever obtain information, and whether the rules in place when you contract are rules that will still apply in twenty years. A lawyer and the relevant register answer this, not the agency.
  • What happens to what is left. Remaining embryos or stored gametes after your family is complete, who decides, and who pays to keep them.
  • Withdrawal of consent. Whether the donor can withdraw before transfer, and what that does to your money and your timeline.

The last two cost the most to leave unasked, and they are also the ones most often answered verbally and never written down. Send them from the agency question checklist, and do not accept a spoken reply.

The carrier has a position of her own

If a surrogate is involved, she is a party to the medical plan and to a contract, not a service being supplied. That means there are questions about her that determine the shape of your own experience:

  • What medical and psychological screening she has been through, and who paid for it.
  • Whether she has been pregnant before, and whether she has her own children.
  • Whether she has her own lawyer, independent of yours and the agency’s, and whether the money for that came out of your fee.
  • At which points she may withdraw from the arrangement, and what happens to the payments already made.
  • Who decides about the pregnancy itself: the number of embryos transferred, whether a selective reduction is contemplated, the mode of delivery, and what happens if her health and the pregnancy conflict.

Ask these of the agency in writing, and ask which of them the carrier herself has agreed to. Where the answer is “that is between her and her lawyer”, note that too: it tells you who holds the obligation, which is what the contract and payment questions will need to locate.

When the carrier also provides the egg

Treat this as a different problem rather than a cheaper version of the same one. Where the person carrying the pregnancy is genetically related to the child, the questions you were going to ask about parentage become harder, not merely more expensive, and they have to be asked before any treatment rather than at birth.

That is not a judgment about whether such an arrangement can work anywhere. The list of things a lawyer must confirm gets longer, and a provider who describes it as a routine variation is worth pressing on exactly which documents they have in mind.

The order in which these constrain each other

The reason this decision comes before the destination, and before any quote, is that it narrows what is still available afterwards:

  1. Gametes first. Whether you need a donor egg, donor sperm, or neither determines which clinics can treat you, and that in turn limits the countries worth researching.
  2. Then the carrier question. Whether you will use a carrier with no genetic link, or your own family member, changes which questions the destination has to answer.
  3. Then the destination. With the arrangement defined, the research list becomes concrete enough to work through country by country in the destination research checklist.
  4. Then money. A quote is only comparable once the arrangement it describes is fixed. Two firms quoting the same total for different gamete arrangements are not quoting the same thing.

People who start with a country and then discover they need a donor egg usually have to start the research again. That is the specific waste this ordering avoids.

What still needs someone with your facts

Which program, clinic or gamete provider suits you, what any country permits, and what these arrangements do to your legal position there: none of that is settled by a general guide. There are no success figures here either. A number about outcomes is a claim a provider makes about itself, and repeating it would lend it a credibility it has not earned.

What is here is the shape of the question list, and the name of the party who owes you an answer.

Questions people ask

Do we have to decide about donors before choosing a country? Before you research seriously, yes. Whether you need donor gametes changes which clinics can serve you, and therefore which countries are worth the work of checking. Deciding afterwards restarts the research.

Does using a donor make the legal side harder? It is not a matter of harder or easier. A donor changes who has to answer, and what has to be asked. That answer depends on the place and on your own status, so it belongs to a lawyer reading your facts.

Can we change our minds once treatment has started? Some choices are revisable at the cost of money and time, and others stop being available once a specific step has been taken. Which of those applies at each stage is a question for the clinic and for the contract, and it is worth asking before the first payment rather than after the first cycle.

Each of these pages covers another part of the same decision.

Your own situation

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