Health officials are warning new Covid-19 restrictions in Kildare, Laois and Offaly could be extended to other areas.
People in the three counties must now stay within their own counties for two weeks, except for essential reasons like for work or medical appointments.
Regulations will be signed to put the regional lockdown on a legal footing while Garda checkpoints will enforce compliance.
It follows a recent outbreak of Covid-19 in the three counties - many in meat processing plants and direct provision centres.
Mobile testing was used to diagnose many of them due to a lack of a more permanent facility in the counties.
Fiona O'Reilly heads medical charity, Safety Net, which operates one of the services.
She says mobile testing could be a game changer if rolled out nationally: