Simpler Hepatitis B Tests Cut Emissions and Boost Sustainable Health Care

A global study finds that simple rapid tests for hepatitis B in pregnant women produce far lower carbon emissions than traditional PCR methods, mainly due to reduced energy use and infrastructure needs. It highlights how low-cost, low-tech diagnostics can improve health outcomes while making health systems more sustainable.

As climate change tightens its grip on global health, a new study is turning attention to an uncomfortable truth: health care itself contributes to the problem. Researchers from Institut Pasteur in Paris, working with partners including the Medical Research Council Unit The Gambia, Imperial College London and the University of Manchester, have examined the environmental footprint of routine medical testing. Their focus is on hepatitis B diagnosis in the Gambia, but the implications reach far beyond one country or disease.

Health care accounts for nearly five percent of global carbon emissions, yet the environmental cost of diagnostics has rarely been studied. At a time when climate change is expected to worsen disease and increase deaths, understanding how medical practices contribute to emissions is becoming increasingly urgent.

Why Hepatitis B Testing Matters

Hepatitis B remains a major global health threat, particularly in low-income countries. One of the most effective ways to reduce its impact is to prevent transmission from mothers to newborns. This requires testing pregnant women and identifying those who need antiviral treatment.

The standard method for doing this is a laboratory-based test known as the polymerase chain reaction (PCR). While accurate, PCR testing is expensive, energy-intensive and dependent on specialised equipment. In many parts of Africa, these requirements make it difficult to scale up testing. Patients often have to travel long distances and return later to collect results, adding both logistical challenges and environmental costs.

Simpler Tests, Smaller Footprint

The study compared PCR testing with two simpler alternatives known as rapid diagnostic tests. One uses blood plasma, while the other uses a finger-prick sample of capillary blood. Both can be performed quickly and without advanced laboratory infrastructure.

The difference in environmental impact is striking. PCR testing produces the highest emissions, generating more than four times the carbon output of the capillary-based rapid test. The plasma-based rapid test falls in between.

The main reason is energy use. PCR machines require controlled temperatures, often maintained through air conditioning, which consumes large amounts of electricity. The equipment itself also adds to emissions. In contrast, rapid tests require little energy and minimal equipment.

The Role of Everyday Logistics

The study shows that emissions are not just about the test itself but also about how care is delivered. In some clinics, patients must return days later to receive results, increasing travel-related emissions. In others, where results are provided on the same day, the carbon footprint is lower.

Simple changes can make a big difference. Eliminating unnecessary air conditioning for rapid tests, which can function at room temperature, significantly reduces emissions. Ensuring same-day testing and results also reduces patient travel.

These findings highlight that improving sustainability does not always require expensive technology. Often, it comes down to smarter organisation of existing services.

A Shift Towards Sustainable Health Care

The study points to a broader shift in how health systems are evaluated. Traditionally, decisions about diagnostic tools have focused on accuracy and cost. Now, environmental impact is emerging as another critical factor.

In resource-limited settings, simpler technologies like rapid diagnostic tests may offer multiple advantages. They are cheaper, easier to use and more resilient in the face of power outages or extreme weather. At the same time, they significantly reduce carbon emissions.

The message is clear: better health care does not have to come at the expense of the planet. By choosing efficient, low-resource solutions and improving how services are delivered, health systems can reduce their environmental impact while still providing effective care.