Known Donor Registry: How to Find and Choose an Identifiable Sperm Donor

A known donor registry is an online platform that connects individuals and couples with sperm or egg donors who are willing to be identified — and, in some cases, to have an ongoing relationship with any children conceived through their donation. Unlike anonymous donation through a sperm bank, a known donor registry allows recipients to learn the donor’s identity, review detailed personal profiles, and communicate directly before making a decision. Platforms like CoParents.com — active since 2008 with over 150,000 registered users — serve this purpose, bridging the gap between those who want to donate and those who need help building a family.

Understanding how a known donor registry works is essential, because the decisions involved have lasting legal, emotional, and health-related consequences. These platforms provide community and resources, but navigating the legal framework, arranging proper health and genetic screenings, and addressing privacy concerns remain the responsibility of both donors and recipients.

How does a known donor registry work?

A known donor registry facilitates connections between people seeking a sperm donor and potential donors whose identity is fully disclosed. Unlike an anonymous donor sourced through a sperm bank, a known donor’s background, appearance, medical history, and motivations are transparent from the outset. Registries typically provide extensive donor profiles that may include photographs, health information, personal descriptions, and details about education and interests.

The key advantages of using a known donor registry include the ability to choose a donor based on a wide range of attributes, full transparency about the donor’s identity and medical background, and the possibility for the child to have a relationship with the donor if all parties agree. According to the American Society for Reproductive Medicine (ASRM), clear communication and legal agreements are essential in any known donor arrangement — regardless of how the connection is made.

However, waiving anonymity comes with important considerations. Both donors and recipients must understand the legal and emotional implications of a disclosed-identity arrangement. Legal agreements should be in place before conception to define the rights and responsibilities of all parties. The psychological impact on the child, the donor, and the recipient family should also be discussed openly — ideally with the support of a counsellor experienced in donor-conceived families.

The donation and insemination process

Whether you find a donor through a known donor registry or a traditional sperm bank, the medical steps involved in achieving pregnancy are similar.

Before donation, donors should undergo rigorous health screening and genetic testing to ensure the safety and quality of the sperm. This includes semen analysis (assessing motility, morphology, and concentration), infectious disease screening (HIV, hepatitis B and C, syphilis, CMV, chlamydia, gonorrhoea), and genetic carrier testing (cystic fibrosis, karyotype analysis). The World Health Organization’s laboratory manual establishes baseline reference values: at least 15 million sperm per millilitre and 32% progressive motility for a normal sample.

When using a known donor registry, it is the recipient’s responsibility to ensure that these tests are completed — unlike at a sperm bank, where screening is mandatory and managed by the institution. This is a critical distinction that recipients must understand before proceeding.

After collection, the sperm can be used fresh or frozen. Fresh sperm from a known donor typically offers higher motility than frozen-thawed samples, which may improve conception odds per cycle. The two main insemination methods are:

IUI (intrauterine insemination): A clinic-based procedure where washed sperm is placed directly into the uterus around the time of ovulation. Success rates average 10% to 20% per cycle for women under 35, according to the ASRM.

IVF (in vitro fertilization): A more complex method where eggs are fertilized with sperm in a laboratory, and resulting embryos are transferred to the uterus. IVF has higher success rates — up to 40% to 50% per cycle for women under 35 — but costs significantly more, typically $10,000 to $15,000+ per cycle.

Home insemination using a needleless syringe (intracervical insemination) is also an option with a known donor, offering privacy and low cost — under $50 in supplies — with success rates of approximately 10% to 15% per cycle.

Legal implications and parental rights when using a known donor registry

Understanding the legal landscape is especially important when using a known donor registry, since the donor’s identity is disclosed from the start. The parental rights of sperm donors vary significantly depending on state and national laws.

In most US states, known sperm donors may waive their parental rights through legal agreements signed before donation takes place. The Uniform Parentage Act (UPA) provides a framework in many jurisdictions, but protections vary — making legal counsel essential. A formal sperm donor agreement, drafted with the help of a lawyer specializing in reproductive law, should explicitly address: waiver of parental rights by the donor, financial obligations (or the absence thereof), confidentiality clauses, and any agreed-upon future involvement with the child.

Without a proper legal agreement, a known donor could potentially be considered the child’s legal father in some jurisdictions — with rights to custody and visitation, and obligations including child support. This risk is significantly higher with known donors than with anonymous sperm bank donors, which is precisely why using a formal donor agreement is non-negotiable when connecting through a known donor registry.

Health and genetic screening considerations

When using a known donor registry, thorough genetic screening is essential to protect the health of donor-conceived children. Donors should undergo comprehensive testing to detect hereditary conditions, including expanded carrier screening that analyzes DNA for genetic mutations associated with conditions like cystic fibrosis, sickle cell disease, Tay-Sachs, and spinal muscular atrophy.

X-linked conditions — gene mutations carried on the X chromosome — can have different implications for male and female offspring, making carrier screening particularly important when the recipient is a carrier. The ASRM recommends that all sperm donors undergo, at minimum, screening for cystic fibrosis carrier status and karyotype analysis, as well as infectious disease testing.

Recipients using a known donor registry should insist on seeing documented test results before proceeding with insemination. Unlike a sperm bank, where all screening is conducted and verified by the institution, a known donor arrangement places the burden of verification on the recipient. This is an area where cutting corners can have serious long-term consequences.

Cost comparison: known donor registry vs. sperm bank

One of the primary reasons people turn to a known donor registry rather than a traditional sperm bank is cost. The financial difference can be substantial.

At a sperm bank, vial prices currently range from $490 to over $2,000 depending on the institution, donor type, and preparation method. Add registration fees ($50–$200), shipping ($200–$300), storage ($100–$475 per year), and clinic fees for IUI ($1,500–$4,000 per cycle) or IVF ($10,000–$15,000+), and the total cost of achieving pregnancy through a sperm bank can easily exceed $10,000 to $20,000.

In contrast, a known donor registry like CoParents.com connects recipients directly with donors, eliminating per-vial costs entirely. The main expenses are medical testing for the donor (typically $200–$500 for a full STI panel and semen analysis), legal fees for drafting a donor agreement ($500–$2,000), and the cost of home insemination supplies (under $50). For many individuals, particularly those planning multiple attempts, the savings are significant.

However, a known donor registry does not offer the same level of mandatory medical screening as a licensed sperm bank. Recipients must take responsibility for ensuring donor health testing is completed, and should factor in the cost of independent genetic screening if this is important to them.

Privacy and support on a known donor registry

Privacy is a critical concern for both donors and recipients on any known donor registry. Reputable platforms implement secure communication channels, privacy policies that protect personal health data, and tools that allow users to block or report suspicious activity.

The emotional dimension of known donor arrangements should not be underestimated. Navigating the relationship between donor, recipient, and any resulting children requires open communication, clear boundaries, and — in many cases — professional counselling. The best known donor registries provide educational resources covering legal, health, and psychological considerations, helping users make informed decisions at every stage.

It’s also worth noting that in the era of direct-to-consumer DNA testing, absolute anonymity is increasingly difficult to guarantee — even in traditionally anonymous arrangements. Platforms like 23andMe and AncestryDNA have already connected thousands of donor-conceived individuals with biological relatives. Choosing a known donor through a known donor registry means embracing transparency from the start, which many families view as healthier for the child’s long-term identity development.

Frequently Asked Questions

How can I find a known sperm donor?

You can find a known sperm donor by approaching someone you know personally — a friend or acquaintance — or by using a known donor registry like CoParents.com, which allows you to browse donor profiles and connect directly with potential donors online. Unlike directed donor programs at fertility clinics, a known donor registry gives recipients more control over the selection process and the ability to build a personal connection with the donor before proceeding.

What legal agreements are needed when using a known donor?

A legally binding donor agreement should be drafted before conception to outline the terms of the donation, including waiver of parental rights, financial obligations, confidentiality, and any future involvement with the child. This document should be prepared with the assistance of a lawyer experienced in reproductive and family law. Without it, a known donor could be legally considered the child’s father in some jurisdictions.

What is the difference between a known donor and a directed donor?

Both are identifiable to the recipient. The key difference is context: a directed donor is specifically chosen by the recipient for donation through a fertility clinic, where the clinic manages screening, collection, and storage. A known donor found through a known donor registry may provide sperm directly — including for home insemination — with the recipient responsible for arranging testing and legal agreements independently.

How much does it cost to use a known donor compared to a sperm bank?

Using a known donor through a registry like CoParents.com eliminates per-vial costs entirely. The main expenses are donor medical testing ($200–$500), a legal donor agreement ($500–$2,000), and insemination supplies (under $50). In comparison, a single sperm bank vial costs $490 to $2,000+, and most women need 3 to 4 cycles to conceive — making the total sperm bank cost $5,000 to $20,000+ before clinic fees.

What health screening should a known donor undergo?

At minimum, a known donor should complete a full STI panel (HIV, hepatitis B and C, syphilis, chlamydia, gonorrhoea), semen analysis (motility, morphology, concentration), blood type testing, and genetic carrier screening (cystic fibrosis at minimum, ideally expanded panel). All test results should be documented and reviewed before insemination begins.