The Fertility Show, London, 1-3 November 2019
Page URL:

Dutch fertility doctor fathered 49 children, DNA tests show

29 April 2019
Appeared in BioNews 996

Genetic tests have confirmed a Dutch doctor fathered 49 children after secretly using his own sperm to impregnate women at his fertility clinic.

The results were released on 12 April, after a two-year legal battle. Dr Jan Karbaat never publicly admitted using his own sperm but claimed privately to have fathered around 60 children when he was director of the Medisch Centrum Bijdorp near Rotterdam. Most of the children were born in the 1980s and are now adults.

Joey Hoofdman said that knowing Dr Karbaat was his biological father allowed him to 'finally close the chapter'. 'After a search of 11 years I can continue my life. I am glad that I finally have clarity,' he said

In 2017, several of Dr Karbaat's patients and their children began a court case to test their DNA against Dr Karbaat's, after suspicion grew that he had used his own sperm rather than that of the women's partners or anonymous donors to father the children (see BioNews 903). 

The court agreed that there was evidence to suggest Dr Karbaat had done so, and permitted DNA tests to be performed on 27 of his personal objects. However, the court also stipulated that the results be sealed and that another judge would be required to rule whether the DNA results could be compared with the DNA of the children conceived at his clinic. 

Following that ruling, Dr Karbaat's son voluntarily provided a sample of his own DNA for comparison, which established a genetic relationship to 19 children born following treatment at the clinic. 

In February 2019, the Rotterdam District Court granted permission for the claimants to compare their DNA to that of Dr Karbaat (see BioNews 987). Overruling objections from Dr Karbaat's family, the judge said: 'If he did [use his own sperm], without announcing it at the time, his widow and other heirs cannot claim that the doctor's anonymity should be respected.' 
Martijn van Halen, one of the children created using Dr Karbaat's sperm, speculated that Dr Karbaat was able to act with impunity because of the culture of silence that prevailed around gamete donation in the 1970s and 1980s, when doctors advised parents not to tell children. 'If something is kept secret from all sides, then the only person with all the information – and that is the doctor – has totally free rein,' he told the Associated Press.

Dr Karbaat died a month before the 2017 case aged 89. The clinic had closed in 2009 for failing to meet storage standards and paperwork irregularities.

Dutch fertility doctor may have more than 49 children
Associated Press |  15 April 2019
Dutch fertility doctor 'secretly fathered at least 49 children'
The Guardian |  12 April 2019
Dutch fertility doctor used own sperm to father 49 children, DNA tests show
BBC |  12 April 2019
1 July 2019 - by Sarah Gregory 
A Canadian fertility specialist, Dr Norman Barwin, has lost his medical licence for using the wrong sperm, including his own, to inseminate a number of IVF patients...
20 May 2019 - by Jen Willows 
A bill to expand the definition of sexual assault to include fertility fraud has been passed by the Texas house of representatives...
13 May 2019 - by Suzi Denton 
Indiana has become the first US state to pass legislation making it a criminal offence for fertility doctors to use their own sperm in treatment without their patients’ prior knowledge and consent...
18 February 2019 - by Suzi Denton 
A Dutch court has granted permission for DNA tests to establish whether a deceased fertility doctor substituted his own sperm when treating patients...
3 December 2018 - by Suzi Denton 
A proposed bill in Indiana would make it a crime for a doctor to use his own sperm during fertility treatment without the patient's consent...
29 August 2017 - by Jen Willows 
A man is being investigated in the Netherlands after claims he fathered over 100 children through sperm donation...
5 June 2017 - by Dr Rachel Montgomery 
A court in the Netherlands has ruled that DNA tests can be performed on items belonging to a deceased fertility clinic director accused of using his own sperm for fertility treatments...
Log in to add a Comment.

By posting a comment you agree to abide by the BioNews terms and conditions

Syndicate this story - click here to enquire about using this story.