The first phase – that sees services transferred from Falkirk and District Royal Infirmary – was officially handed over to NHS officials by builders Laing O'Rourke on Monday.
Services, used by patients from the Bo'ness, Blackness and Whitecross areas, include renal dialysis, chemotherapy, day surgery, X rays, inpatient care following surgery and certain outpatient clinics.
A three month operation to orientate staff and install £30 million worth of equipment began almost immediately.
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