From Health 201FailSystems

Synnovis says the 3 June 2024 attack affected almost all of its IT systems and interrupted many pathology services. Stolen data were published on 20 June, and full restoration took until late autumn 2024. Because the affected hospitals could not match patients' blood at the usual frequency, NHS Blood and Transplant appealed on 10 June for O-positive and O-negative donors. NHS England reported 10,152 acute outpatient appointments and 1,710 elective procedures postponed at King's College Hospital and Guy's and St Thomas'. The UK government now uses Synnovis as its case study for designating 'critical suppliers' under the Cyber Security and Resilience Bill, citing more than 11,000 disrupted appointments and operations and estimated losses of £32.7m. In June 2025 King's College Hospital said a patient safety investigation into one patient's unexpected death had found several contributing factors, including a long wait for a blood test result caused by the attack. The Register reported that South East London ICB recorded 170 patients harmed, mostly low harm. In 2026 The Record reported that South London and Maudsley was still working with pathology systems that had not been fully restored, and had logged 122 incidents of incorrect, unavailable or delayed results.^{[1,2,3,4,5,6,7,8]}

One death in which the delayed blood result was a contributing factor (KCH, June 2025). About 170 patients harmed, mostly low harm, per South East London ICB as reported by The Register. More than 10,000 appointments and 1,710 procedures postponed.