Islanders are being asked not to attend A&E over the weekend unless they have a 'genuine medical emergency'.
That's because the health service is moving all patient records to an electronic system, which it says could result in delays at the hospital.
Interim HCS Chief Officer Chris Brown says that the move will streamline processes and improve accuracy,
"HCS is committed to delivering the highest standard of healthcare and patient safety. We have taken comprehensive measures to minimise any potential inconveniences that may arise during this transition.
Our healthcare professionals will be supported by a team of IT experts to ensure a smooth transition, with minimal disruption to patient care."
The 'precautionary' measure of asking people to avoid the emergency department is to allow doctors and nurses to prioritise critical cases.
The digital system is due to be live from Sunday (28 May).

Jersey and Guernsey's Chambers of Commerce saddened by Blue Islands' collapse
Aurigny announces inter-islands flights
Loganair steps in to take some Blue Islands routes
Blue Islands cancels upcoming flights as airline ceases trading
Simon Calder: 'To lose one airline is unfortunate, two looks like carelessness'
Jersey's minimum wage set to rise by 59p an hour
Parish of St Helier apologises for 'disrespecting' the Cenotaph
"Half an hour isn't long enough": Jersey Airport warns travellers to arrive on time