{"id":103238,"date":"2026-07-10T19:10:01","date_gmt":"2026-07-10T19:10:01","guid":{"rendered":"https:\/\/youzum.net\/sperm-donors-need-limits-says-a-european-fertility-group\/"},"modified":"2026-07-10T19:10:01","modified_gmt":"2026-07-10T19:10:01","slug":"sperm-donors-need-limits-says-a-european-fertility-group","status":"publish","type":"post","link":"https:\/\/youzum.net\/ja\/sperm-donors-need-limits-says-a-european-fertility-group\/","title":{"rendered":"Sperm donors need limits, says a European fertility group"},"content":{"rendered":"<div data-chronoton-summary=\"&lt;ul&gt;&lt;br&gt;&lt;li&gt;&lt;strong&gt;A European fertility group is calling for donor limits:&lt;\/strong&gt; The European Society of Human Reproduction and Embryology wants sperm and egg banks to cap donations at 50 families per donor \u2014 with a long-term goal of 15 \u2014 after some donors fathered hundreds of children across multiple countries.&lt;\/li&gt;&lt;br&gt;&lt;li&gt;&lt;strong&gt;National limits aren't working:&lt;\/strong&gt; Donated sperm routinely crosses borders, making country-by-country rules nearly impossible to enforce. Denmark caps donations at 12 families, but exports sperm worldwide.&lt;\/li&gt;&lt;br&gt;&lt;li&gt;&lt;strong&gt;The human cost is real:&lt;\/strong&gt; One Dutch donor fathered 550\u2013600 children before being ordered to stop. A Danish donor with a cancer-linked genetic mutation had already fathered at least 197 children across Europe \u2014 some of whom developed cancer and died.&lt;\/li&gt;&lt;br&gt;&lt;li&gt;&lt;strong&gt;Donor-conceived people want stricter rules:&lt;\/strong&gt; Ties van der Meer, who still doesn't know how many siblings he has, says even five families per donor feels high. He calls ESHRE's proposal a &quot;positive first step&quot; \u2014 but notes that &quot;you have to start somewhere.&lt;\/li&gt;&lt;\/ul&gt;\" data-chronoton-post-id=\"1140289\" data-chronoton-expand-collapse=\"1\" data-chronoton-analytics-enabled=\"1\"><\/div>\n<p>Ties van der Meer doesn\u2019t know how many siblings he has.<\/p>\n<p>The 47-year-old was conceived at a private fertility clinic in the Netherlands using sperm provided by an anonymous donor. After the Netherlands banned anonymous donation in 2004, the doctor who ran the clinic destroyed records that might have identified those donors, he says.<\/p>\n<p><strong>He describes the situation as \u201cproblematic.\u201d <\/strong>Children have a right to know their biological parents, he says. While he did ultimately track down one sibling, who helped him identify his father along with other genetic relatives, he may have others he\u2019ll never find.<\/p>\n<p>Other donor-conceived people who have been able to track down siblings have found they have tens or even hundreds of them. One donor-conceived woman who found 25 half-siblings over the course of seven years\u00a0<a href=\"https:\/\/www.theguardian.com\/science\/article\/2024\/aug\/18\/you-feel-a-bit-mass-produced-donor-conceived-people-on-the-export-of-uk-sperm\">told the <em>Guardian<\/em><\/a>, \u201cIt does make you feel a bit mass-produced.\u201d<\/p>\n<p>We need international limits on the number of children a single donor can contribute to, a European fertility organization argued yesterday. At a conference in London, members laid out plans to start with a Europe-wide limit.<\/p>\n<p>Today many countries, including the UK, have banned anonymous egg and sperm donation. But anonymity can\u2019t be guaranteed even in places where it is technically allowed. Genetic tests offered by companies like Ancestry and 23andMe, along with genetic registries, have made it much easier for donor-conceived people to find parents and siblings who share their genes.<\/p>\n<p>And because sperm can be frozen and stored for years before it is eventually used, the current set-up can result in situations where donor-conceived people discover the identity of a genetic parent only after the person\u2019s death. They might also find that they have siblings of very different ages, all around the world.<\/p>\n<p>Some people are finding <em>hundreds<\/em> of siblings. Sperm from Jonathan Meijer, a Dutch man who began donating in 2007, was\u00a0<a href=\"https:\/\/www.bbc.co.uk\/news\/world-europe-65429936\">used to conceive between 550 and 600 children<\/a>. (<a href=\"https:\/\/donorkind.nl\/\">Stichting Donorkind<\/a>, a foundation and advocacy group for donor-conceived people that\u2019s chaired by van der Meer, took him to court, and\u00a0<a href=\"https:\/\/www.bbc.co.uk\/news\/world-europe-65429936\">he was ordered to stop donating in 2023<\/a>.)<\/p>\n<p>Stories like these can be distressing for donor-conceived people. And there are other reasons why limits are considered important. The offspring of a prolific donor might be at risk of unknowingly forming romantic or sexual relationships, for instance. And some people are concerned that a donor with a harmful genetic mutation might pass that down to many children.<\/p>\n<p>This is unlikely, given the level of screening that most donors undergo. But it has happened. A man who donated his sperm to a sperm bank in Denmark was found to have a genetic mutation that significantly increased the risk of multiple cancers. But\u00a0<a href=\"https:\/\/www.dw.com\/en\/sperm-bank-sold-mans-cancer-linked-genes-across-europe\/a-75072227\">his sperm had already been used to conceive at least 197 children across Europe<\/a>. Some of those children developed cancer. Some died.<\/p>\n<p>Many countries already have legal limits for donors. In Malta and Cyprus, for example, both egg and sperm donors are allowed to contribute to the birth of just a single child, according to data presented at\u00a0<a href=\"https:\/\/www.eshre.eu\/ESHRE2026\">the European Society of Human Reproduction and Embryology (ESHRE) meeting<\/a> in London on July 8.<\/p>\n<p>Other countries set limits based on the number of families a single donor can contribute to, allowing recipients to have children who share a genetic link. In the UK, that limit is set at 10 families per donor.<\/p>\n<p>But these limits are difficult to enforce, partly because donated gametes don\u2019t necessarily stay in their original country. In Denmark, the national limit is set at 12 families. But the country is a major exporter of sperm. In the UK, for example,\u00a0<a href=\"https:\/\/www.hfea.gov.uk\/about-us\/publications\/research-and-data\/trends-in-egg-sperm-and-embryo-donation-2020\">more than half of sperm donations in 2020 were imported<\/a>\u2014with most of those coming from either Denmark or the US.<\/p>\n<p>\u201cThe only thing that really makes sense is a transnational limit,\u201d Jackson Kirkman-Brown, a professor of reproductive biology at the University of Birmingham, said at the meeting.<\/p>\n<p>Kirkman-Brown and his colleagues have spent months putting together <a href=\"https:\/\/academic.oup.com\/humrep\/advance-article\/doi\/10.1093\/humrep\/deag108\/8726004\">a document<\/a> that represents ESHRE\u2019s position on these limits. After consulting with fertility specialists, clinics, sperm and egg banks, donors, and donor-conceived people, the team has developed a plan to start with a Europe-wide limit on sperm and egg donations.<\/p>\n<p>ESHRE is calling on sperm and egg banks, as well as fertility clinics, to respect an initial limit of 50 families per donor. That\u2019s still very high, according to a handful of people I spoke to at the meeting. But at least it\u2019s a start.<\/p>\n<p>Europe should move toward setting limits at 15 families per donor, Kirkman-Brown said. \u201cWe may find that 15 is also too high,\u201d says Vasanti Jadva, who studies the psychological well-being of people conceived using donated eggs, sperm, and embryos at City St George\u2019s in London. \u201cWe still don\u2019t know what the right number is.\u201d<\/p>\n<p>It will be difficult to enforce these limits, too. And if they end up limiting the supply of donor sperm, there\u2019s a chance that some people will turn to\u00a0<a href=\"https:\/\/www.hfea.gov.uk\/about-us\/media-centre\/faqs-relating-to-unregulated-sperm-donation\">unregulated sperm donations<\/a> from people who do not undergo health screening. Unregulated donations can lead to other problems for prospective parents, including the possibility that donors will\u00a0<a href=\"https:\/\/www.bbc.co.uk\/news\/articles\/c5yer90xpzno\">seek parental rights over the children conceived using their sperm<\/a>.<\/p>\n<p>And it will be even harder to establish international limits. When I asked the American Society of Reproductive Medicine for its thoughts on ESHRE\u2019s proposed limits, a representative directed me to\u00a0<a href=\"https:\/\/www.asrm.org\/practice-guidance\/practice-committee-documents\/guidance-regarding-gamete-and-embryo-donation\/\">a guidance document<\/a> saying \u201cit has been suggested\u201d that for a population of 800,000, single donors should be limited to \u201cno more than 25 births\u201d in order to avoid the risk that relatives will have children together. (Considering the US has a population of over 340 million, the total figure could be pretty high, but many sperm banks opt to limit the number of families contributed to by a single donor at around 25.)<\/p>\n<p>Van der Meer thinks that even a limit of five families from a single donor would be high. International donation makes it even harder for donor-conceived people to connect with genetic relatives, so the limit for international contributions should be set at two families, he says.<\/p>\n<p>Still, he thinks ESHRE\u2019s suggested limit is a \u201cpositive first step.\u201d Van der Meer has managed to track down a sibling, his father, and nephews, aunts, and uncles. He hopes that future policies respect the rights of donor-conceived children to know, and be in contact with, their genetic relatives.<\/p>\n<p>\u201cBut,\u201d he says, \u201cyou have to start somewhere.\u201d<\/p>\n<p><em>This article first appeared in The Checkup,\u00a0<\/em>MIT Technology Review\u2019s<em>\u00a0weekly biotech newsletter. To receive it in your inbox every Thursday, and read articles like this first,\u00a0<\/em><a href=\"https:\/\/forms.technologyreview.com\/newsletters\/biotech-the-checkup\/?_ga=2.241810882.15113993.1664981064-43237434.1647441349\"><em>sign up here<\/em><\/a><em>.<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Ties van der Meer doesn\u2019t know how many siblings he has. The 47-year-old was conceived at a private fertility clinic in the Netherlands using sperm provided by an anonymous donor. After the Netherlands banned anonymous donation in 2004, the doctor who ran the clinic destroyed records that might have identified those donors, he says. He describes the situation as \u201cproblematic.\u201d Children have a right to know their biological parents, he says. While he did ultimately track down one sibling, who helped him identify his father along with other genetic relatives, he may have others he\u2019ll never find. Other donor-conceived people who have been able to track down siblings have found they have tens or even hundreds of them. One donor-conceived woman who found 25 half-siblings over the course of seven years\u00a0told the Guardian, \u201cIt does make you feel a bit mass-produced.\u201d We need international limits on the number of children a single donor can contribute to, a European fertility organization argued yesterday. At a conference in London, members laid out plans to start with a Europe-wide limit. Today many countries, including the UK, have banned anonymous egg and sperm donation. But anonymity can\u2019t be guaranteed even in places where it is technically allowed. Genetic tests offered by companies like Ancestry and 23andMe, along with genetic registries, have made it much easier for donor-conceived people to find parents and siblings who share their genes. And because sperm can be frozen and stored for years before it is eventually used, the current set-up can result in situations where donor-conceived people discover the identity of a genetic parent only after the person\u2019s death. They might also find that they have siblings of very different ages, all around the world. Some people are finding hundreds of siblings. Sperm from Jonathan Meijer, a Dutch man who began donating in 2007, was\u00a0used to conceive between 550 and 600 children. (Stichting Donorkind, a foundation and advocacy group for donor-conceived people that\u2019s chaired by van der Meer, took him to court, and\u00a0he was ordered to stop donating in 2023.) Stories like these can be distressing for donor-conceived people. And there are other reasons why limits are considered important. The offspring of a prolific donor might be at risk of unknowingly forming romantic or sexual relationships, for instance. And some people are concerned that a donor with a harmful genetic mutation might pass that down to many children. This is unlikely, given the level of screening that most donors undergo. But it has happened. A man who donated his sperm to a sperm bank in Denmark was found to have a genetic mutation that significantly increased the risk of multiple cancers. But\u00a0his sperm had already been used to conceive at least 197 children across Europe. Some of those children developed cancer. Some died. Many countries already have legal limits for donors. In Malta and Cyprus, for example, both egg and sperm donors are allowed to contribute to the birth of just a single child, according to data presented at\u00a0the European Society of Human Reproduction and Embryology (ESHRE) meeting in London on July 8. Other countries set limits based on the number of families a single donor can contribute to, allowing recipients to have children who share a genetic link. In the UK, that limit is set at 10 families per donor. But these limits are difficult to enforce, partly because donated gametes don\u2019t necessarily stay in their original country. In Denmark, the national limit is set at 12 families. But the country is a major exporter of sperm. In the UK, for example,\u00a0more than half of sperm donations in 2020 were imported\u2014with most of those coming from either Denmark or the US. \u201cThe only thing that really makes sense is a transnational limit,\u201d Jackson Kirkman-Brown, a professor of reproductive biology at the University of Birmingham, said at the meeting. Kirkman-Brown and his colleagues have spent months putting together a document that represents ESHRE\u2019s position on these limits. After consulting with fertility specialists, clinics, sperm and egg banks, donors, and donor-conceived people, the team has developed a plan to start with a Europe-wide limit on sperm and egg donations. ESHRE is calling on sperm and egg banks, as well as fertility clinics, to respect an initial limit of 50 families per donor. That\u2019s still very high, according to a handful of people I spoke to at the meeting. But at least it\u2019s a start. Europe should move toward setting limits at 15 families per donor, Kirkman-Brown said. \u201cWe may find that 15 is also too high,\u201d says Vasanti Jadva, who studies the psychological well-being of people conceived using donated eggs, sperm, and embryos at City St George\u2019s in London. \u201cWe still don\u2019t know what the right number is.\u201d It will be difficult to enforce these limits, too. And if they end up limiting the supply of donor sperm, there\u2019s a chance that some people will turn to\u00a0unregulated sperm donations from people who do not undergo health screening. Unregulated donations can lead to other problems for prospective parents, including the possibility that donors will\u00a0seek parental rights over the children conceived using their sperm. And it will be even harder to establish international limits. When I asked the American Society of Reproductive Medicine for its thoughts on ESHRE\u2019s proposed limits, a representative directed me to\u00a0a guidance document saying \u201cit has been suggested\u201d that for a population of 800,000, single donors should be limited to \u201cno more than 25 births\u201d in order to avoid the risk that relatives will have children together. (Considering the US has a population of over 340 million, the total figure could be pretty high, but many sperm banks opt to limit the number of families contributed to by a single donor at around 25.) Van der Meer thinks that even a limit of five families from a single donor would be high. International donation makes it even harder for donor-conceived people to connect with genetic relatives, so the limit for international contributions should be set at two<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pmpro_default_level":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_pvb_checkbox_block_on_post":false,"footnotes":""},"categories":[52,5,7,1],"tags":[],"class_list":["post-103238","post","type-post","status-publish","format-standard","hentry","category-ai-club","category-committee","category-news","category-uncategorized","pmpro-has-access"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - 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The 47-year-old was conceived at a private fertility clinic in the Netherlands using sperm provided by an anonymous donor. After the Netherlands banned anonymous donation in 2004, the doctor who ran the clinic destroyed records that might have identified those donors, he says. 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