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Amendment to the Donor Data Law
As of 1 April 2025, the Donor Data Act for Artificial Insemination has been amended. Thanks to this legislative change, the Donor Data Registry (Cdkb) will gain better national insight into the number of treatments per donor. This helps prevent sperm from a single donor being used for more than 12 women and ensures greater transparency and oversight within the donor registration system.
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Update June 2025: Learning from the Past
Recent media coverage has highlighted that, in the past, more than 25 children were born from the same sperm donor. This deviation from the guidelines that were in place at the time also occurred at Medisch Centrum Kinderwens (MCK). You may have read or heard about this.
We fully understand that this news may impact parents, children, and donors — and that it raises important questions. We feel deeply involved and responsible. These decisions were made (under the leadership of the clinic’s previous owner) with good intentions — for example, in response to requests from mothers to have genetically related siblings — but then did not align with the existing guidelines.
We regret that these decisions were made at the time, that clients and donors were not adequately informed, and that it took long for the policy to be corrected. As an organization, we take responsibility for informing all those affected.
We sympathize strongly with everyone involved, and we will of course continue to work closely with our regulator, as well as with patients, children, and donors who could benefit from our support.
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What is this about?
• Until 1992, there were no official rules regarding the maximum number of children per donor.
• Since 1992, the national CBO guideline advised a maximum of 25 children per donor.
• The policy at SMCG and later MCK was aimed at helping as many women as possible start a family. As we understand it, under the leadership of the former owner, it was decided around 20 years ago to interpret the guideline differently: applying the limit to 25 families per donor rather than 25 children.
• At SMCG/MCK, the 25-child guideline was exceeded for 36 donors. More detailed figures can be found here:
www.tfp-fertility.com/nl-nl/landelijk-inzichtdonorregistratie
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Current Guidelines
• In 2018, the guideline was changed to a maximum of 12 families per donor. Since then, MCK has strictly followed this limit.
• As of 1 April 2025, the legal limit of 12 families per donor has been formalized in Dutch law.
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Contacting Those Involved
If you are a mother or a donor affected by this deviation from the guideline, you will receive a letter from us before 1 July 2025. We are happy to speak with you directly to explain your specific situation.
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More Information
You can find further information and ways to contact us on our dedicated website:
What will change from 1 April 2025?
From 1 April 2025, every sperm donor, egg donor and embryo donors will receive a maximum of 12 mother codes. Every woman who wants to become pregnant from a donor will receive one of these codes. If no more mother codes are available, a donor may no longer be used in the Netherlands. This also applies retroactively to donors who were already used up to 1 April 2025. Clinics register donors with the Donor Data Office for Artificial Insemination (Cdkb). Under the old law, registration was carried out after the treatment and only once there was a pregnancy.
From 1 April 2025 this will change, and it will be legally required to register the donor before a treatment with donor sperm. A treatment can only start after 1 April if the donor is registered and a mother code is available and assigned.
New way of registering
In recent months, each already registered unique donor has been linked to a donor code. All registered women have received a mother code that is linked to the donor code of the donor whose reproductive cells they were treated with. Per donor, a maximum of 12 mother codes are available. Due to this new way of registering, the Cdkb and the clinics have gained more insight into the number of offspring per donor that were conceived via clinics in the past.
Professional guideline
From 2004 to 2018, clinics worked with the professional guideline of a maximum of 25 offspring per donor. Since 2018, this guideline has been adjusted to a maximum of 12 families per donor. To avoid confusion in determining whether there is a violation of this guideline regarding the maximum number of offspring per donor, the starting point of 25 offspring per donor has been used. Both before and after 2018, the goal was to limit the number of offspring per donor.
For detailed information about your specific situation: More information.
For detailed explanation about the figures: More information figures
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