The Hospital Authority (HA) has reported a suspected case of forgery involving a calibration certificate for vibration sensors used in a hospital construction project.

According to the authority, a calibration certificate for the sensors - submitted by subcontractor Novox to main contractor China Railway Construction Group for the expansion project of the Lai King Building in Princess Margaret Hospital - was allegedly found to be fraudulent.

Verification checks revealed that the certificate was not issued by the laboratory Guangdong Zhongzhenghang Metrology Testing as claimed on the document, the authority said.

The sensors are part of a system that monitors construction-related vibrations to prevent disruption to hospital operations and medical services.

In a statement, an HA spokesperson emphasised that these instruments are used as a precautionary measure.

"The main contractor also uses portable instruments for manual monitoring," the spokesperson said.

"We are also closely monitoring the feedback from our stakeholders. Should any healthcare staff report any service disturbance from the construction work, regardless of whether the vibration levels exceed specified limits, the hospital will prioritise patient safety and medical services by immediately suspending the relevant construction work."

The authority confirmed that over the past six months, no medical services have been suspended due to vibrations from hospital construction.

The HA has instructed the main contractor to suspend all work involving Novox.

The authority said it is also reviewing all hospital construction projects and services linked to the subcontractor and will investigate any further suspected fraudulent activity.