Saliva testing provider Rako Science believes long queues at Covid-19 testing centres and test result notification delays could have been avoided if the Government had engaged its services sooner.

And now the New Zealand-owned company's director is sending a message to the Ministry of Health, asking to resume conversations about how saliva testing can be made available to the public.

It comes as Rako Science begins work with its first Māori healthcare and social services provider, Te Whānau o Waipareira, to establish saliva testing for its staff and eventually its community.

The New Zealand Herald is awaiting a response from the Ministry of Health.

Speaking to media in Auckland today, Rako Science chief science officer Dr ​Stephen Grice believed many of the testing strains felt during the current outbreak would have been reduced, had saliva testing been operational.

"If our capacity was utilised, the wait times in the queues would decrease, the turnaround time would decrease all at the same time without compromising scientific standards and people potentially are more likely to come forward because it's less invasive," he said.

Due to excess demand, some people in Auckland waited more than 11 hours for a nasopharyngeal swab test last week. In some instances, results were not returned for up to five days.

Grice claims Rako Science and its partners have the ability to process 10,000 saliva tests per day with an average turnaround time of 193 minutes - slightly more than three hours.

When a NZ Herald staffer was tested at midday on Friday, a negative result was received within a little over four hours.

Rako Science's saliva test, which is said to be just as effective at detecting Covid-19 as a swab test, is believed to be the only test in the country which is diagnostically validated, meaning it was tested using real-world samples of Covid-19.

The test involves the subject drooling into a teaspoon before depositing the sample into a small tube. Subjects could not eat, chew gum, vape or brush their teeth an hour beforehand to ensure the sample wasn't compromised.

The Kiwi company has been contracted to provide such testing for multiple groups and organisations, including staff at Auckland Airport, Air New Zealand, Fisher and Paykel, and for New Zealand's Olympians and Para Olympians.

"We believe the test has got the science backing and logistics behind it and all things that are required while maintaining security and accuracy," Grice said.

He confirmed saliva testing was not a replacement of the swab test, but was more suitable for workforces such as some border staff who were tested as regularly as every three days.

Grice also said the quicker turnaround time was more effective in preventing spread of the Delta variant, which was renowned for its rapid transmission.

However, Rako Science has received little attention from the Ministry of Health - despite the company attempting to engage the ministry for months.

Grice denied the hold up was caused by Rako Science but would not elaborate, saying "that's for others to answer".

IGENZ, a privately owned medical testing laboratory, partners Rako Science in its saliva testing rollout.