David Cameron is to confirm plans for an extra £8bn for the NHS in England by 2020, if the Tories win the election.
He will claim it makes his party the first to promise to fund a five-year plan for the health service, drawn up by its boss Simon Stevens last year.
Labour says the "unfunded" pledge is a sign of a Conservative campaign in panic. It has pledged an extra £2.5bn, funded by a "mansion tax".
The Lib Dems have also pledged £8bn, funded by scrapping some tax relief.
Last year Simon Stevens, head of NHS England, cited the figure as the gap between what the NHS gets and what it needs to implement his modernisation programme.


On Saturday, Mr Cameron will promise same-day access to GPs for over-75s, recruitment of more than 5,000 family doctors, better integration of GP and hospital services and improved weekend and evening access to healthcare for patients.
"As someone whose been supported by the NHS at the most difficult time in my life, I'm utterly committed to ensuring it is there for everyone when they need it too," Mr Cameron will say, referring to the treatment received for cerebral palsy by his son, Ivan, before his death in 2009.
"That's why I'm backing the NHS's own plan with the cash required to ensure it can continue to deliver an amazing service to patients and their families in the future."
Policy guide: Health and care

 This issue includes NHS funding, GP access and social care, particularly of older people.

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Mr Cameron's announcement coincides with Labour confirming its £138m pledge to recruit 3,000 extra midwives to ensure women get one-to-one care during labour, funded - in part - by its planned tax on homes worth £2m or more.
A Labour spokesman described the Conservative pledge as "unfunded and unbelievable", saying: "The Tories want you to think that they will invest in the NHS, but their claims cannot be trusted because their commitments are unfunded.
"Their extreme spending plans would see them cut twice as fast next year as last year, putting the NHS at risk."
Last month, Liberal Democrat leader Nick Clegg challenged his rivals to "come clean" on how they would fund the £8bn shortfall.
He said his party would add £2bn allocated in the Autumn Statement to funds raised by scrapping some reliefs on capital gains tax and employee share schemes, enabling it to invest £3.5bn over six years on mental health care.
A party spokesman said: "Until we see the Tories' spending plans, we cannot give credit to this announcement. We are the only party to set out a credible plan for raising the extra funding."
NHS England boss Simon Stevens says efficiency savings can account for £22bn of the service's £30bn shortfall Conservative Health Secretary Jeremy Hunt has previously said a Tory government would give the NHS in England "whatever" it needs to fill the predicted funding gap left over when the service makes predicted savings of £22bn against a shortfall of £30bn.
Mr Hunt did not say how this would be funded, but he told the BBC: "They might need less than £8bn if they can make more efficiency savings, or they might need more than £8bn if they can't make those efficiency savings."
BBC political correspondent Ben Geoghegan says: "With growing pressure on the NHS, the political parties have been trying to reassure voters that it will be properly funded in the future.
"NHS England says that if spending increases in line with inflation, there'll be a £30bn shortfall in the health service budget by 2020."
NHS bosses hope that much of that gap can be filled by internal savings, he adds.

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