The cyber attack had a 'major impact' on services across Guys's St Thomas', King College Hospital and the Royal Brompton.
Several senior sources confirmed the ransomware attack, indicating pathology results may now take 'weeks' instead of 'days.'
NHS Blood and Transport are appealing for O-Positive and O-Negative donors to address the shortage caused by the cyber attack.
NHS staff are working to minimize disruptions, urging patients to access services as usual via NHS App or NHS 111.
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