Hospitals have vowed to minimise disruption to patients ahead of large scale industrial action on Monday.
Health workers from a range of unions are set to walk out in co-ordinated action in a row over pay.
Members of the Society of Radiographers will also refuse to work between 8am and noon.
Those working in urgent care will offer “life and limb” support during the four hours of industrial action. Union members are asked to “work to rule” until Friday, November 28 by refusing to do overtime and insisting on taking their breaks.
Bosses from Kirklees and Calderdale hospitals said they had put plans in place to cope with the walk out.
Patients with appointments on Monday morning are being advised to keep them unless they have heard otherwise.
Medical director at Calderdale and Huddersfield NHS Foundation Trust, David Birkenhead, said: “At present, the Trust is not expecting the day of industrial action by some unions on Monday to disrupt our ability to deliver care for all our patients.
“We have extensive contingency plans in place in all areas to ensure our Trust continues to deliver a full range of care and support services for all our inpatients and outpatients. If you have an appointment on the day please attend as usual.”
At Dewsbury District Hospital, Neil Clark, director of operations, said: “We are working hard to put in place a number of plans to keep disruption to an absolute minimum and ensure we provide the very best possible care for our patients during this time.
“We have cancelled a number of non-urgent appointments and procedures but we have tried to keep these to a minimum.
“In affected areas, we have contacted patients to let them know.
“If you have an appointment scheduled for Monday and have not heard from us, please assume your appointment is going ahead as normal.”
Unions taking part in the action include; UNISON, Royal College of Midwives (RCM) Allied Trades and Technicians (UCATT), British Association of Occupational Therapists (BAOT), GMB, Unite, Managers in Partnership (MiP), the British Dietetic Association (BDA) and the Society of Radiographers (SoR).
The strike comes just six weeks after last month’s walk out – the biggest NHS strike since 1982.
Members have vowed they will continue action until Health Secretary Jeremy Hunt agrees to resume pay talks.
A similar strike by local government workers was averted after fresh talks were agreed.