Prime Minister Julia Gillard says she isn't losing sleep over the latest poll showing Labor's primary vote stands at just 30 per cent.

"We see a lot of opinion polls," Ms Gillard told the Seven Network's Sunrise program on Monday.

"If I spent time worrying about them and commentating on opinion polls then I wouldn't have the time to get my job done.

"So each and every day I just let that wash through and I focus on what I need to do as prime minister."

Asked if her colleagues had given her a deadline to turn the polls around, Ms Gillard said: "Certainly not."

Federal Labor's primary vote stands at just 30 per cent, down five points since December, according to the latest Herald/Nielsen poll published in Fairfax newspapers.

Support for the coalition is up four points, taking its primary vote to 47 per cent - its highest level since just after the carbon tax began in July 2012.

On a two-party-preferred basis, Labor's support is at 45 per cent, well behind the 55 per cent for the coalition, according to voter feedback on the direction of second preferences.

Based on preference flows from the 2010 election, the two-party split is 44-56 in favour of the coalition.

Opposition Leader Tony Abbott has also overtaken Ms Gillard in the preferred prime minister stakes, with his support leaping nine points to 49 per cent compared with Ms Gillard on 45 - down five points.

The national poll of 1400 voters found the popularity of former prime minister Kevin Rudd has also grown, with Mr Rudd favoured by 61 per cent of respondents to just 35 per cent for Ms Gillard.

Commenting on continuing speculation of another leadership challenge by Mr Rudd, Ms Gillard said "all of these issues were resolved by the Labor team in February last year".