She said she had managed to record her 12-year-old son's positive RAT result online, but had needed to phone up to record the positive result of her younger child.
She called and left her number two days in a row, before calling again on the third day and waiting on hold until someone answered.
"The woman sounded very stressed. They are dealing with a big volume I understand," she said.
A Ministry of Health spokesperson said they acknowledged there had been delays in reporting over the phone.
"The Ministry of Health acknowledges there have been some waits for people who have called the 0800 number to report their Rapid Antigen Test results during a period of high demand."
Staffing across the shifts has now been increased to match the call demand of the RATs 0800 number, said the spokesperson.
"Other Ministry contracted call centres have been provided with training and access to assist with responses to requests for RATs and recording results.
"This will help reduce the time people have to wait to speak to [an] operator."
"We want to acknowledge and thank people for reporting their RATs results, negative or positive, which helps support public health decision-making in response to the pandemic."
