NDHB said its hospitals are extremely busy at the moment.
''With the long weekend ahead we need to make sure our resources are used to help those who need it most. Please only come to hospital if your need is urgent,'' the DHB said.
''If you or a whānau member is unwell and you are not sure whether you should come to hospital or not, call Healthline for free on 0800 611 116 and they will advise you on what you should do. You can also call your GP or visit White Cross. Remember - if it's a medical emergency – call 111.''
A medical emergency includes chest pain or tightness, difficulty breathing, choking, severe bleeding or bleeding that won't stop, sudden weakness or difficulty talking, fainting or unconsciousness.
''Vaccination remains our best defence against Covid-19 and a booster, in addition to first and second doses of the Covid-19 vaccine, will give you greater immunity against Omicron and severe illness. There is a much lower risk of being hospitalised if you are up to date with your vaccinations, which, for Omicron, includes a third or booster dose if eligible,'' the Ministry of Health said.
In Northland 90.1 per cent of eligible people have had their first dose; 88 per cent their second dose and 69.4 per cent have had boosters.
For Covid testing/vaccination and RATs centre details of locations and opening hours go to:
For Covid-19 testing locations, visit https://www.northlanddhb.org.nz/home/covid-19/getting-tested/northland-testing-locations/
For Covid-19 RATs collection sites, visit https://www.healthpoint.co.nz/community-health-services/community-health/northland-dhb-rapid-antigen-testing-rats/
For Covid-19 vaccination locations, visit https://www.northlanddhb.org.nz/home/covid-19/getting-vaccinated/northland-vaccination-clinics/