Spiwe Thebe v M. Mbewe t/a Checkpoint Laboratory Services

The appellant Thebe was sent by her insurance company (First Mutual Life Assurance Company) to the respondent Mbewe's laboratory (Checkpoint Laboratory Services) for an HIV/AIDS test in connection with renewing her insurance policy valued over $100,000. On 22 October 1997, a blood sample was taken by Mbewe's employee, Steve Chibukwe, a qualified laboratory technician with 2-3 years experience. The test results, communicated to the insurance company on 27 October 1997, were positive. When Thebe was informed of the positive result on 28 October 1997, she was shocked and distressed. She immediately went to her own doctor who referred her to Clinical Laboratories for another test on the same day - this result was negative. A subsequent western blot test on 17 November 1997 also showed negative. A third test at Cimas Medical Laboratories on 27 November 1997 also returned negative results. Notably, Thebe had previously tested negative in January 1997. Mbewe insisted his tests were correct, conducting another test on the remaining blood sample which again showed positive. Professor Peter Robert Marson, an expert witness, testified that it was not medically possible for HIV status to change from positive to negative, and that the discrepancy indicated an error in collection and labelling of the blood sample at Mbewe's laboratory.

• Whether Mbewe was negligent in failing to conduct a second confirmatory test on a low-risk person before reporting positive HIV results to the insurance company
• Whether Mbewe was negligent in the collection and labelling of the blood sample
• Whether errors in medical testing procedures amount to negligence deserving of damages
• What is the appropriate quantum of damages for transitory mental trauma caused by erroneous HIV-positive test results
• Whether costs should be awarded on the High Court scale or Magistrate's Court scale

Both the appeal and cross-appeal were dismissed with costs. The order of the court a quo was amended by deleting the words 'at the Magistrate's Court Scale', thereby awarding costs on the High Court scale instead. The award of damages in the sum of $2,000 was confirmed.

A medical laboratory and its personnel owe a duty of care to exercise reasonable skill and care in conducting HIV/AIDS tests. Negligence in the fundamental procedural aspects of medical testing - specifically the proper collection and labelling of blood samples - constitutes a breach of the standard of care expected of a reasonably skilled medical technician and is actionable in damages. Such basic procedural errors are not 'inherent risks' in medical procedures or 'errors of judgment' but represent failures to exercise due skill and care deserving of censure. Where a medical laboratory's client is an insurance company rather than the person tested, the laboratory's duty regarding confirmatory testing is owed to the insurance company in accordance with its instructions, not to the person tested. Guidelines requiring second confirmatory tests for low-risk persons do not impose obligations on laboratories when they lack knowledge of the person's risk profile and have no instructions to conduct such tests.

The Court observed that matters concerning HIV/AIDS are high-profile issues of the highest concern to the country and the world, warranting pronouncement by superior courts as virgin territory in the law. The Court noted that assessment of damages is within the discretion of the trial judge and appellate courts will be reluctant to interfere absent misdirection. The Court commented that previous case authorities on medical negligence involving inherent risks, accidents, or errors of judgment have limited application to cases involving basic procedural failures in medical testing. The Court also observed that damages for psychological trauma should be supported by evidence of actual medical or psychiatric treatment sought, counselling attended, or substantiated social consequences.

This case represents the first Zimbabwean superior court pronouncement on liability for negligent HIV/AIDS testing, establishing important precedents in medical negligence law. It clarifies the duty of care owed by medical laboratories and the distinction between obligations to direct clients versus third parties referred for testing. The case establishes that fundamental procedural errors in medical testing (such as improper collection and labelling of samples) constitute actionable negligence, even where professional judgment or inherent medical risks are not involved. It also provides guidance on assessment of damages for transitory psychological trauma caused by erroneous positive HIV test results in the context of the HIV/AIDS epidemic. The judgment recognizes HIV/AIDS testing as a high-profile public interest matter warranting determination by superior courts regardless of quantum claimed.