Over the past 24 hours 70 per cent of people going through Auckland's Covid testing sites were not symptomatic.
Around 20,000 swabs were processed yesterday from 17 sites in Auckland, which means around 14,000 were from people without symptoms.
Northern Region Health Coordination Centre (NRHCC) chief clinical officer Andrew Old said they were able to manage the demand at the current level, but they would struggle if demand increased.
"Turnaround times on results would take longer - currently people can expect their results in two days."
He said 3.5 per cent of all tests processed over the past couple of days have been positive, up a percentage from last week, and the increase affects lab testing capacity.
Covid testing centres across Auckland are under pressure as Omicron continues to spread across the country.