The UK's fertility regulator is expected to announce that stem cell researchers can recruit egg donors not already having treatment.
The UK's fertility regulator has announced that women not undergoing fertility treatment can donate their eggs to medical research.
The Human Fertilisation and Embryology Authority has faced criticism, as it has given one team the go-ahead before the end of a consultation on the issue.
The Human Fertilisation and Embryology Authority said women would not be paid for "altruistic donation" but would be eligible for expenses.
Some scientists say they need human eggs for the creation of embryos from which stem cells can be derived.
Some scientists say they need human eggs for the creation of embryos from which stem cells can be derived.
But critics say egg donation involves potential health risks.
But critics say egg donation involves potential health risks.
Previously women have only been able to donate spare eggs produced through IVF or gynaecological treatment, such as sterilisation.
It is just to early for us to be encouarging this to happen Dr Stephen MingerKing's College London
It is just to early for us to be encouarging this to happen Dr Stephen MingerKing's College London
The HFEA will make its ruling at a board meeting in London.
Now women choosing to donate their eggs to researchers will be able to claim up to £250 in expenses.
If it does give the go-ahead, women taking part could claim up to £250 in expenses.
The HFEA also said women should be allowed to donate through "egg-sharing" schemes, in which they receive cut-price IVF in return for handing over eggs.
Earlier this year, the team at the Centre for Life in Newcastle was awarded a temporary licence to offer discounted IVF treatment if patients donate eggs for research.
Earlier this year, the team at the Centre for Life in Newcastle was awarded a temporary licence to offer discounted IVF treatment if patients donate eggs for research.
But it emerged that, in November, the centre was also given the UK's first licence to begin recruiting women donors who are not already having medical treatment - so-called altruistic donation, leading to criticism of the HFEA.
But it emerged that, in November, the centre was also given the UK's first licence to begin recruiting women donors who are not already having medical treatment - so-called altruistic donation, leading to criticism of the HFEA.
The authority said: "The recent decision to allow one centre to carry out altruistic egg donation for research will not affect the outcome of the consultation.
The authority said: "The HFEA has a statutory obligation to consider research applications as they come in and therefore must deal with them."
"The HFEA has a statutory obligation to consider research applications as they come in and therefore must deal with them."
Professor Alison Murdoch, who is director of the Newcastle Fertility Centre at Life, said: "Women are capable of making their own minds up about whether or not they donate their eggs for research. Society should respect their autonomy."
Professor Alison Murdoch, who is director of the Newcastle Fertility Centre at Life, said: "Women are capable of making their own minds up about whether or not they donate their eggs for research. Society should respect their autonomy."
Professor Peter Braude, director of the Centre for Preimplantation Genetic Diagnosis at Guy's and St Thomas' Foundation Trust, said: "Women have been donating eggs for more than 20 years, usually those undergoing sterilsation where the eggs would be used to study early embryonic development.
"The difference now is that women are being asked as volunteers where their ovaries would be stimulated to develop eggs specifically and solely for research."
He added: "I do not see a problem with that."
Premature
Premature
But some experts were unhappy with the ruling.
Dr Stephen Minger, an expert in stem cell research at King's College London, said work using human eggs was still in its infancy, and it was premature to be encouraging women to hand over their eggs for research.
Dr Stephen Minger, an expert in stem cell research at King's College London, said work using human eggs was still in its infancy, and it was premature to be encouraging women to hand over their eggs for research.
He said the method used to retrieve eggs required the use of powerful hormones, and the insertion of a needle through the wall of the uterus.
He said the method used to retrieve eggs required the use of powerful hormones, and the insertion of a needle through the wall of the uterus.
"Many of us have said lets perfect this technology using alternative sources of eggs, such as cow eggs, until it does become justified to look for altruistic donation of eggs for these procedures.
"Many of us have said lets perfect this technology using alternative sources of eggs, such as cow eggs, until it does become justified to look for altruistic donation of eggs for these procedures.
"I think it is just to early for us to be encouraging this to happen."
"I think it is just to early for us to be encouraging this to happen."
Josephine Quintavalle, director of the campaign group Comment on Reproductive Ethics, said: "Safeguarding donors should be the only objective of the HFEA.
Josephine Quintavalle, director of the campaign group Comment on Reproductive Ethics, said: "Risks associated with egg harvesting are widely acknowledged, particularly in response to ovarian hyperstimulation."
"It is not their role to facilitate the tissue requirements of the research lobby."
Anna Smajdor, researcher in Medical Ethics at Imperial College, said women should be offered fair payment for donation.
She added: "Risks associated with egg harvesting are widely acknowledged, particularly in response to ovarian hyperstimulation."
"The advantage is all on the side of those who already stand to gain, while altruistic donors assume all the risks and receive none of the benefits."
But fertility expert, Lord Robert Winston, said he could see no problem with paying women to donate eggs for research as it already happens for other tissues, for example in patients giving samples as part of drug trials.
Fertility expert, Lord Robert Winston, said paying women to donate eggs for research already happens for other tissues, for example in patients giving samples as part of drug trials.
However, he added that there was another issue that needed to be dealt with - women being offered free IVF treatment in return for donating their eggs to other women with fertility problems.
However, he added women being offered free IVF treatment in return for donating their eggs to other women with fertility problems was concerning.
"Women have been paying for eggs in Britain for a very long time, because there is egg sharing and what happens is there is a bartering, a trade in eggs, which is really quite worrying and the HFEA have sanctioned that.
"Women have been paying for eggs in Britain for a very long time, because there is egg sharing, a trade in eggs, which is really quite worrying and the HFEA have sanctioned that."
"And large numbers of women are undoubtedly going abroad to buy eggs, which is a very unsatisfactory situation," he said.
Professor Chris Higgins, director of the MRC Clinical Sciences Centre at Imperial College said: "I am sure the HFEA will, as usual, make a wise decision to ensure that informed volunteers can participate in medical research which will benefit all of us.
"After all, an egg is just another cell."
Are you affected by this story? Are you a woman who has donated eggs in the past? Would you consider donating eggs if you were paid?
Are you affected by this story? Are you a woman who has donated eggs in the past? Would you consider donating eggs if you were paid?
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