Case type IVF & Fertility Treatment Injuries

Egg & Donor Egg Mix-Ups

Did genetic testing show that your child or your embryos did not come from your eggs, or from the donor you chose? Tell us your story.

CBW Law reviews egg and donor egg mix-up claims for patients nationwide, including mix-ups involving a patient’s own eggs, frozen eggs and eggs from a selected donor. We listen, help gather the clinic, lab and donor records, and explain what the facts may support. Tell Us Your Story. Contacting us does not create an attorney-client relationship.

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Egg mix-up claim review Tell Us Your Story Contacting us does not create an attorney-client relationship. Or call us any time (800) 476-2416

An egg mix-up happens when eggs from the wrong person are used to create embryos. It can involve a patient’s own eggs, eggs frozen years earlier, or eggs from a donor the patient selected. Because an egg carries half of a child’s genes, a mix-up can mean the woman who planned to be the genetic mother is not.8 When a mix-up is suspected, genetic testing and complete lab and donor records are what show which eggs were used.

What counts as an egg or donor egg mix-up

Eggs are collected in a minor procedure in which a thin needle, guided by ultrasound, draws them from the ovaries. If a woman cannot produce eggs, donated eggs may be used.1 An egg donor goes through the same stimulation and retrieval steps, and her eggs are then fertilized with sperm from the recipient’s partner or a sperm donor.2 3 Sometimes, to share costs, the eggs from one donor cycle are split among several recipients.3

One large IVF lab’s quality system places a pregnancy or birth involving a misidentified egg in its most serious error category.6 An egg mix-up can involve:

Eggs from one patient’s retrieval labeled or recorded as another patient’s
The wrong patient’s frozen eggs thawed and used
Eggs from a different donor than the one the recipient chose
Mistakes in dividing one donor’s eggs among several recipients
Records that attach the wrong patient or donor ID to eggs or the embryos made from them

An egg mix-up is not the same as a sperm mix-up, where the wrong sperm is used, or an embryo mix-up, where a correctly made embryo goes to the wrong patient. It is also different from a dispute over inaccurate donor information, where the chosen donor’s eggs were used but her profile, health history or test results were wrong or incomplete. Each problem leaves a different trail in the records.

Points where eggs can be misidentified or misallocated

Eggs pass through many hands between retrieval and transfer. A review of more than 181,000 procedures at a large Boston IVF lab, including egg retrievals, inseminations and transfers, found that 99.96% went ahead without a recorded moderate or significant problem. The authors still stressed that errors are inevitable and that clinics should be honest and transparent when they happen.6 Risk points include:

Labeling tubes and dishes at retrieval
Recording which eggs belong to whom
Splitting a donor’s eggs among recipients
Freezing eggs and logging their location
Thawing eggs months or years later
Pairing eggs with the right sperm sample

European good-practice guidance says patients should be asked directly for at least their full name and date of birth before eggs are collected.7 A German review of mix-ups found that relying only on a patient’s spoken confirmation is not error-proof, especially when there is a language barrier.7

Several layers of federal rules and professional guidance apply to egg donation. They address who may donate, what recipients are told, and how eggs are tracked.

Key standards

FDA oversight: The FDA regulates donated eggs as human cells and tissues. Establishments that recover, process, store, label or distribute them must register with the FDA, and donors must be screened and tested for certain infectious diseases.5
Professional guidance: ASRM and the Society for Assisted Reproductive Technology updated their gamete and embryo donation guidance in 2024. It covers screening donors and recipients for infections, genetic disease and psychological factors.4
Donor history: ASRM’s patient guidance says egg donors should complete a detailed personal and family medical history and have genetic carrier screening.3
Consent: Written consent should be obtained for any third-party reproduction procedure, and known donors and intended parents are advised to have separate legal counsel.3
Identification: Patients should state their full name and date of birth before eggs are collected, and labs use manual or electronic witnessing to double-check identity at critical steps.7

What is known, and what is still unsettled

Public reports of egg mix-ups are scarce, and no national database tracks any IVF errors.11 NBC News found 13 lawsuits in U.S. courts from 2019 through 2024 that alleged swapped embryos, eggs or sperm.11 Because so few cases become public, the law in this area is still developing.

Reproductive law specialists have described the core scenario: a couple learns through prenatal testing or after birth that the child is related to the intended father but not to the intended mother. Depending on state law and notice, the woman who carried the pregnancy may or may not be deemed the legal mother, and the woman whose eggs were used might be treated as an unknowing donor or as a legal mother.8

What is established:

Lab quality systems have classed a misidentified egg leading to pregnancy or birth as a major error6
Genetic testing of embryos can help identify a mix-up and, in some cases, its root cause9
Laws on third-party reproduction are missing in some states and differ from state to state3

What is often unresolved:

Who is a child’s legal mother when the birth mother is not the genetic mother8
What rights, if any, the unknowing source of the eggs has8
How courts value the loss of a planned genetic connection11
Whether an arbitration clause decides where a claim is heard11

Investigating a suspected egg mix-up

A suspected egg mix-up usually starts with a test result, a records problem or a notice from the clinic. Common starting points include:

Prenatal or newborn DNA testing that does not match the intended mother8
Embryo genetic testing that does not match the intended parents’ DNA9
Consumer DNA results that point to an unexpected genetic mother
Donor records listing a different donor than the one chosen
An egg count or storage log that does not add up

Genetic testing of embryos can help identify a mix-up and sometimes trace how it happened.9 For a child, a DNA test that compares the child with the intended mother gives the clearest answer. If a donor was used, the clinic’s or egg bank’s records should show which donor’s eggs were released for your cycle, and when.

Be careful not to read too much into donor traits. A donor profile describes the donor, not the child, and children can show traits that neither genetic parent shows.10 A difference in looks is a reason to ask questions, not proof of an error.

Genetic relationships, medical history and family impact

When the wrong eggs are used, the harm reaches well beyond one treatment cycle. It can include:

Loss of the genetic connection the family planned for
A child’s medical and family history that is unknown or wrong3
Donor screening results that describe a different woman than the child’s genetic mother
Another woman who may be the child’s genetic mother without knowing it8
Parentage questions that turn on state law8
Grief, anger and hard decisions about remaining eggs or embryos
The cost of more cycles, or the loss of eggs that cannot be replaced

These questions may grow. Egg freezing has become more common, and specialists expect more gamete and embryo mix-ups to be discovered as genetic identification tools become easier to use.8

Talking to an attorney about an egg mix-up claim

An egg mix-up attorney starts with what you agreed to and what the records show. A claim review may consider:

Whose eggs were supposed to be used, and what you consented to
The donor you selected and the donor ID in the lab’s records
How a donor’s eggs were divided, if they were shared3
Retrieval, freezing, thaw and insemination records
Genetic test results for embryos or the child
What the clinic, egg bank or agency told you, and when
Your contract, including any arbitration clause11
Which state’s law applies and how much time remains

Some situations involve both an identification error and inaccurate donor information, and these can raise different legal claims. A review works out what happened before anyone assumes who is at fault. Because laws on eggs, embryos and third-party reproduction vary by state, the answer can depend on where you were treated.3 Whether a lawsuit makes sense is a decision for after that review, not before it.

Who may be accountable

Possible parties, depending on what the records show, include:

The fertility clinic and its embryology lab
The physician who managed the retrieval or the recipient’s cycle
A frozen egg bank that stored, selected or shipped the eggs
A donor agency that matched the donor and passed along her information
A storage facility that held frozen eggs or embryos

None of these is assumed to be at fault. If eggs or embryos were sent out for genetic testing, a separate lab may also hold key records; see embryo genetic testing sample mix-ups. For other lab problems, see IVF laboratory errors.

Choosing whose eggs to use is one of the most personal decisions in fertility care. When that choice is not honored, families deserve the full record.

Deadlines for egg mix-up claims

Deadlines to file a lawsuit vary by state, by type of claim and by who is being sued. A medical malpractice claim against a clinic may follow different rules than a contract claim against an egg bank or donor agency.

New York is one example. Its medical malpractice statute generally requires a lawsuit within two years and six months of the act or omission, or of the last treatment when there is continuous treatment for the same condition.12 The statute’s discovery exceptions are limited to specific situations, such as a foreign object left in the body.12 In some cases, time can run before a family learns of an error.

Other states use different periods, and some have broader discovery rules. If you suspect an egg mix-up, an attorney can check which deadlines may apply to you.

Tell Us Your Story →

Records that show which eggs were used

Ask for records in writing and keep copies. Donor and egg bank records may be held by a different company than your clinic.

Records to request

Donor and egg bank records

Donor profile, ID number and screening summary
Donor selection and matching documents
Records of how a donor’s eggs were divided
Shipping and receipt logs for frozen eggs

Clinic and lab records

Egg retrieval notes and egg counts
Freezing, storage location and thaw logs
Insemination and embryo records by ID
Witnessing logs and incident reports

Consent forms and donor agreements
Embryo genetic testing reports
Prenatal, newborn or DNA test results
Emails, portal messages and billing statements

Your next steps with CBW Law

How we review an egg mix-up

Share what happened

Tell us whose eggs were supposed to be used and what raised your concern. A rough timeline is fine.
Clarify the question

We help separate a possible identification error from a donor-information problem or an ordinary treatment outcome.
Collect the records

With your permission, we request clinic, lab, egg bank and testing records.
Talk through options

We explain what the records show and which deadlines may apply. Reaching out does not mean a claim can be filed or that any party will be found responsible.

Plain English

Medical, Health & Insurance

Donor profiles, lab logs and insurance statements use terms that are easy to confuse. Here is what the common ones mean.

Egg and donation terms

Egg retrieval: A minor procedure, also called follicular aspiration, in which a thin needle guided by ultrasound draws eggs from the ovaries.1
Donor eggs: Eggs from another woman, who goes through stimulation and retrieval so her eggs can be fertilized for the recipient.2
Shared donor cycle: A donor cycle in which the eggs are split among several recipients, often to share costs.3
Known or anonymous donor: A known donor is someone the recipient knows; an anonymous donor is found through a program or agency.3

Lab and testing terms

Genetic carrier screening: Testing a donor to see whether she carries genes for certain inherited diseases.3
Preimplantation genetic testing (PGT): Testing a few cells removed from an embryo before transfer.1 Its genetic data can also help investigate mix-ups.9
Witnessing: A manual or electronic double-check that the right eggs are matched to the right patient at critical steps.7

Family terms

Intended parent: The person or couple who plans to raise the child.3
Genetic mother: The woman whose egg created the embryo.
Gestational carrier: A woman who carries a pregnancy from an embryo that is not biologically related to her.2

Insurance and billing terms

Explanation of benefits (EOB): A health plan statement showing what was billed and paid. It can help confirm dates of retrieval, transfer and testing.
Egg bank or agency invoice: A bill from an egg bank or donor agency. It often lists the donor ID and the number of eggs purchased.
Arbitration agreement: A contract term that sends disputes to a private decision-maker instead of a court. Many IVF patients sign one.11

Questions

Frequently asked egg mix-up questions

Short answers to questions patients ask about eggs, donors and mix-ups.

What is an egg mix-up?

An egg mix-up happens when eggs from the wrong person are used to create embryos. That can mean another patient’s eggs, the wrong frozen eggs, or eggs from a different donor than the one chosen. At least one large IVF lab classes a pregnancy or birth from a misidentified egg as a major error, its most serious category.6

How is an egg mix-up different from inaccurate donor information?

In an egg mix-up, the wrong eggs were used. In a donor-information case, the chosen donor’s eggs were used, but what you were told about her, such as her health history or test results, was wrong or incomplete. The two can overlap, but they rely on different records and may raise different legal claims.

Our donor-egg baby does not look like the donor’s photos. Is that a sign of a mix-up?

Not on its own. Many genes shape traits like eye color, and children can show traits that neither genetic parent shows.10 A donor’s photos describe her, not the child. If you have real doubts, DNA testing and the clinic’s donor records are how to check, not appearance.

How can I find out whether the right eggs were used?

DNA testing that compares the child with the intended mother, or with the donor if her sample is available, is the clearest answer. If embryos were genetically tested, that data may also help.9 Ask the clinic and any egg bank for the records showing which eggs were retrieved, stored, thawed and used.

Can a mix-up happen with my own frozen eggs?

Yes. Frozen eggs must be labeled, stored and thawed correctly, sometimes years after retrieval, and each step depends on accurate identification. Specialists note that egg freezing has become more common, which they expect to bring more mix-ups to light.8 Storage and thaw logs are key records in these cases.

What if my donor’s eggs were shared with other recipients?

Shared or split donor cycles are a recognized practice, often used to share costs.3 They add steps where eggs must be counted, divided and labeled for each recipient. If you suspect a problem, the records of how the eggs were divided, and who received them, are important to request.

Am I the legal mother if the wrong eggs were used?

It depends on state law. Reproductive law specialists note that a woman who carried the pregnancy may or may not be deemed the legal mother, depending on state law and notice, and the woman whose eggs were used might be treated as an unknowing donor or as a legal mother.8 A family law attorney in your state can explain how these rules apply.

Are egg donors screened for genetic conditions?

ASRM’s patient guidance says egg donors should give a detailed family history and have genetic carrier screening.3 The FDA also requires donors to be screened and tested for certain infectious diseases.5 But screening describes only the woman who was screened. If the wrong eggs were used, those results may not apply to your child.

Do clinics have to report egg mix-ups?

Not to any federal or state agency. NBC News reported in 2025 that IVF clinics are not required to report errors and that no national database tracks them.11 Researchers who study IVF lab errors say clinics should be honest and transparent with patients when errors happen.6

How long do I have to file an egg mix-up lawsuit?

It depends on your state and the claim. In New York, for example, medical malpractice claims generally must be filed within two years and six months of the act or omission, or of the last continuous treatment.12 Other states use different rules, so it helps to ask a lawyer about deadlines as soon as you suspect a mix-up.

Tell Us Your Story

An egg mix-up can undo one of a family’s most personal choices: whose genes their child would carry. Retrieval logs, donor records and genetic testing are what show which eggs were used.

If you believe the wrong eggs, or the wrong donor’s eggs, were used in your treatment, we are ready to listen. Tell us your story, and we will walk through what the records may show.