Barnett said there was particular concern about the isolation and work-from-home mandates, which are proving difficult and confusing to comply with.
He warned that the risk this posed to business operations could end up impacting customer service and supply.
"If you're in manufacturing, operations and a wide range of customer-facing sectors work from home is not feasible," Barnett said.
"The enabler to keep these critical functions and jobs secured, are rapid antigen tests."
He said that an overwhelming number of the businesses surveyed would be using these tests if they could get their hands on them.
"If they were available, 83 per cent of businesses would be using them and have some certainty that they could function efficiently and have their workers, all of whom are essential and critical, on-site, in jobs and able to be paid," Barnett said.
"Government needs to work with the private sector to ensure the red-light does not mean stop. It should be enabling business and providing the full range of tools, including testing kits, to keep businesses and jobs operating as close to normal as spelt out under the red-light protection framework."