Can clinics mix sperm from both partners?
No. Each embryo carries the DNA of one father, and most clinics will not mix sperm from two men in a single dish. Paternity must be identifiable for every embryo, and FDA donor screening applies to each man separately, so each sample must be traced to the man it came from.
That leaves three options for two dads:
- One partner's sperm for all embryos. Every embryo in the batch has the same genetic father.
- A split cycle. The egg donor's eggs are divided, and half are fertilized with each partner's sperm. You end up with embryos from both fathers.
- Separate journeys. One father provides sperm for the first pregnancy, and the other for a later one, often with the same egg donor.
Whichever you choose, both of you can be legal parents of every child through a parentage order.
What is a split egg donor cycle?
In a split cycle, your clinic divides the mature eggs from one donor retrieval into two groups, one fertilized with each father's sperm. The embryos are grown to the blastocyst stage, labeled by father, and frozen.
The trade-off is numbers. A split cycle divides the same eggs, so each father gets roughly half the embryos. If the donor produces fewer eggs than expected, a father may have only one or two. Couples with fewer eggs sometimes plan a second donor retrieval.
| Option | Embryos per father | Extra cost | Timeline | Parentage paperwork |
|---|---|---|---|---|
| One partner's sperm for all embryos | All from one father | None beyond standard IVF | One donor cycle | Order names both fathers; same genetic father for every child |
| Split cycle | Roughly half the embryos each | Two sperm preparations, sometimes a second PGT-A batch; no extra PLS fee | One donor cycle; a second if yield is low | Order names both fathers; genetic father differs by child |
| Separate journeys, one father per pregnancy | All from that pregnancy's father | A second IVF cycle unless embryos are banked | Two donor cycles, or one now and one later | Same as a split cycle, one pregnancy at a time |
At PLS, a split cycle costs no extra agency fee. The egg donor match fee and program fee do not change.
How do couples decide which father goes first?
There is no medical rule. Couples usually decide on one or more of these:
- Age. Sperm quality changes with age, so some couples start with the older partner.
- Semen analysis. If one partner's results are stronger, the clinic may suggest starting with him.
- Embryo results. In a split cycle, couples often transfer first whichever father has more normal embryos after testing. See PGT-A testing.
- Family plans. If you want two children, many couples plan one from each father.
Using the same egg donor for both fathers means your children share a genetic mother. Many two-dad families value that.
Can we transfer one embryo from each dad at the same time?
Some clinics allow it. Most, following ASRM guidance, recommend single embryo transfer. Two embryos raise the chance of twins, and twin pregnancies carry higher risks for the surrogate and the babies, including preterm birth and high blood pressure in pregnancy.
Your surrogate must also agree, in the gestational carrier contract, before any transfer. PLS discusses this with both sides before the match.
For most couples, the safer route to one child from each father is two pregnancies, one embryo each time.
How does sperm testing and FDA screening work for two men?
Each father goes through the same steps, separately.
- Semen analysis. The clinic measures count, motility and shape. This tells the lab which fertilization method to use.
- Infectious disease testing. Because the embryos will be transferred to a surrogate who is not your sexual partner, FDA donor eligibility rules apply to each father. That means a questionnaire and blood tests for infectious diseases. Clinics time these tests close to the date the sample is collected, and some require the sample to be frozen and held until results are back.
- Genetic carrier screening. Each father's carrier screening should be on the same panel as the egg donor's, or one that covers the same conditions. In a split cycle, the donor's results are compared with both fathers' results, not just one.
- Sample collection. Each father provides his own labeled sample, fresh on retrieval day or frozen in advance.
See IVF for surrogacy for the full lab process.
What does a split cycle change about legal parentage?
Less than most couples expect. The genetic father may differ from one child to the next, but your attorney seeks parentage for both fathers for every child.
Under Illinois law, the genetic link does not decide who the legal parents are. The Equality for Every Family Act, signed in December 2025, removed the earlier requirement that at least one intended parent contribute an egg or sperm, so a pre-birth parentage order can name both fathers regardless of whose sperm was used. Statute details are reviewed by counsel.
Many attorneys also recommend a confirmatory adoption or judgment for the non-genetic father, because every US state and every foreign country must honor a court judgment, while not all honor a birth certificate alone. If you live outside the US, your home country may treat the genetic and non-genetic father differently. Ask counsel at home before you decide whose sperm to use.
PLS does not employ attorneys. It refers you to independent reproductive-law attorneys. See how both dads become legal parents, and for the full sequence of steps, how surrogacy works for two dads.
Questions before a consultation? SurrogacyHotline.com answers free, usually within 24 to 48 hours.
Sources
- American Society for Reproductive Medicine (ASRM), guidance on the number of embryos to transfer.
- US Food and Drug Administration (FDA), donor eligibility rules (21 CFR Part 1271).
- Illinois Gestational Surrogacy Act (2005) and Equality for Every Family Act (December 2025), Illinois General Assembly. Pending review by counsel.