High court ruling exposes negligence risk hiding in specialist technical roles
Pregnant, pressured and still liable: a Hong Kong court has ruled that workload and pregnancy are no defence when professionals make obvious mistakes.
On January 22, 2026, the Hong Kong Court of First Instance handed down its judgment in Diagcor Bioscience Incorporated Limited v Chan Wai Hon Billy and others. The case is mostly about alleged misuse of genetic testing trade secrets. Tucked inside, though, is a striking ruling on employee negligence that goes straight to questions of accountability, workload and how far employers can rely on their specialists.
At the centre is Maggie Fang, a medical laboratory technologist who rose to Associate Laboratory Manager at biotech company Diagcor. Her role was not only technical. In the court's words, she acted as the "final gatekeeper" for genetic test reports. Once she signed, reports went out to doctors with no further check.
In December 2011, a doctor sent a pregnant patient, known in the judgment as Madam A, for an alpha-thalassaemia test. A junior technician ran the test and misread the result as normal. In fact, the foetus carried a serious inherited blood disorder. Fang reviewed the gel image, accepted the junior's interpretation and signed the report. The mistake was not picked up until April 2012, when the doctor queried the result. Diagcor later settled with the patient for HK$183,150 and said it lost roughly HK$1.7 million a year in referrals from the clinic.
By the time the case reached trial, Fang did not dispute that the report was wrong. She pointed instead to context. She was pregnant with her second child, handling a heavy workload and under pressure. She also argued that Diagcor had not treated the incident as negligence when it happened and had taken no disciplinary action against her.
Justice David Lok was not persuaded. Looking at the test image, he found that no band appeared where a normal result would show, and that an abnormal band was clearly visible. Fang herself admitted that the error was obvious and that a MLT-I — a holder of the senior grade of the Register of Medical Laboratory Technologies, which was her own qualification — should have been able to detect such mutation. In an internal investigation report she prepared at the time, she concluded that a "false negative result was reported due to human error and carelessness."
The court preferred that contemporaneous assessment over the defences raised at trial. It also rejected the idea that personal circumstances could excuse this level of mistake, writing that "pregnancy and heavy workload are not proper defences for a professional to justify such kind of mistake."
Diagcor argued that Fang had breached the duty of care she owed as a qualified professional and an implied term in her employment contract to exercise reasonable care and skill. The court agreed. It found her negligent in relation to the alpha-thalassaemia report and in breach of her contractual obligations. A second negligence claim, involving a more complex beta-thalassaemia test in May 2012, was dismissed. There, the judge said the mistake was far less clear and Diagcor had not produced specialist evidence to show Fang had fallen below professional standards.
One point that will interest people running HR teams is the court's treatment of delay. Diagcor had not disciplined Fang at the time, and its founder even described her as "a very good technician." Only after she later joined a rival business did the company decide to pursue a claim. The court held that the earlier decision not to discipline her did not amount to waiving its rights. So long as it sued within the legal time limit, the claim could proceed.
For HR and people leaders, the judgment quietly reinforces a few hard lines. Where a role is designed as a single point of sign-off, the person in that role carries heavy responsibility, and courts will measure them against the standard of a competent professional, not against how busy or stressed they felt. Personal circumstances may be very real, but they will not excuse an obvious error in a safety-critical setting.
The case also shows that choosing not to discipline at the time does not lock an employer out of later action. That can cut both ways. It may reassure organisations that hesitate before moving against a valued high performer. It should also remind HR to keep clear records and to be explicit with managers and specialists about where professional responsibility truly sits.
