Ed Miliband has visited a cricket club in Nuneaton to launch Labour's new election campaign posters on the NHS.
He told supporters that the IFS assessment of party manifestos showed the Tories were committed to "extreme spending plans" that would "end up cutting the NHS".
Labour have blasted Jeremy Hunt after he admitted voters did not believe the Tories over the NHS.
Shadow Health Minister Andy Burnham said: "Jeremy Hunt has finally conceded what everyone knows to be true, you can't trust a word the Tories say on the NHS.
"The reason why they have a credibility problem is because they have a track record of failing to keep NHS promises.
"Last time out, they promised 'no top-down reorganisation' - but then brought forward the biggest in the history of the NHS.
"People won't believe David Cameron on the NHS at this election because they know he hasn't got a clue where the money is coming from. They know you can't fund the NHS on an IOU.
"While Labour has a better, fully funded plan to invest in the NHS, the Tories have a plan for extreme cuts which will see them cut the NHS."
Jeremy Hunt has compared modern politics to dating app Tinder and called for a return to old-fashioned doorstep canvassing.
Both of the men with a chance of being PM has something they're not telling you. It's about the way they plan to fund the whole NHS.
Labour will pledge more cancer tests to be carried out by family doctors and new equipment to help treat sufferers.