Preparations are well underway for a switch in the way we screen for cervical cancer.

A less-invasive swab test, with the option of self testing, is in line to be introduced, with the current smear test being reserved for those who need further investigation.

Te Whatu Ora anticipates launching the new test from late July, with the phased implementation running through to the end of next March.

Around 450,000 samples are expected to be processed in the first year.

Officials say labs have ordered test kits in advance, and they don't expect to have any issues with supply for the start of the programme.

National Centre for Women's Health Research Director Bev Lawton says it's a positive figure.

"We would expect to have more tests than we're having now, which is at 300,000- 330,000 screening at the moment. So I think that's good."

Bev Lawton says there are two key parts, it's a more effective test, and women have the option to do it themselves.

"Both of those contribute. If we actually make the maximum of this new program, there's more opportunities to reduce cancer, probably by 15 to 18 percent. So it's really exciting."

However, a petition is calling for the incoming cervical cancer swab testing to be free.

Bev Lawton says the lack of funding is the big negative.

"Women will die unnecessarily of cervical cancer due to the lack of opportunities to have this screening and continue on with the screening pathway.

Te Whatu Ora says the screening programme is not fully funded, meaning there's a small charge, but some providers offer a free or low-cost service.