"This dispute is about getting a pay offer for allied health workers that not only shows them that they are valued parts of the health system, but also helps them keep track with the skyrocketing cost of living."
A Canterbury DHB spokesperson said many of its services would be affected by the strike and waiting times would be longer.
About 100 outpatient and 220 community appointments run by Allied Health staff have been cancelled.
"The 24-hour strike will generally affect the patient flow, in particular, some discharges back to the community where physio, social work, occupational therapy and dieticians are often involved," a DHB spokesperson said.
Only urgent laboratory tests will take place today for life-preserving criteria for critical patients.
Burwood Hospital elective operating theatres will be closed and five operating theatres will be open at Christchurch Hospital for life-preserving surgery.
Meanwhile, Auckland DHB said patient safety remained its priority and it would continue to provide emergency and life-preserving services.
Emergency departments will remain open.