The NHS has become a key election battleground with a Conservatives pledge of an extra £8 billion a year for the NHS in England by 2020. Both Labour and the Liberal Democrats have attacked the announcement as an "unfunded" spending commitment.
Meanwhile, Labour is pledging one-to-one midwife care for every woman during childbirth as it launches its health manifesto.
The Conservatives took a two percentage point lead over the Labour party while support for Ukip fell in a new opinion poll.
The online poll of 1,916 adults put the Conservative Party up three points on 36% and the Labour Party up one point on 34%.
Meanwhile support for Ukip fell three points to 11%, the lowest level in the poll since 2012, while the Liberal Democrats were unchanged on 7% and the Greens were down one at 6%.
Opinium Research surveyed 1,916 adults online on April 8 and 9 for the Observer newspaper.
The NHS has become a key battleground for the political parties as election day moves ever closer.
Labour is to launch its Health Manifesto which it says will "put personalised care at its heart".
The Conservatives have upped the ante in the key election battleground of the NHS but are accused of issuing an "unfunded" spending pledge.