One in five UK doctors use a generative artificial intelligence (Gen AI) tool – such as OpenAI’s ChatGPT or Google’s Gemini – to assist with clinical practice. This is according to a recent survey of around 1,000 GPs.

Doctors reported using GenAI to generate documentation after appointments, help make clinical decisions and provide information to patients – such as comprehensible discharge summaries and treatment plans.

Considering the hype around artificial intelligence coupled with the challenges health systems are facing, it’s no surprise doctors and policymakers alike see AI as key in modernising and transforming our health services.

However, GenAI is a recent innovation that fundamentally challenges how we think about patient safety. There’s still much we need to know about GenAI before it can be used safely in everyday clinical practice.

The problems with GenAI

Traditionally, AI applications have been developed to perform a very specific task. For example, deep-learning neural networks have been used for classification in imaging and diagnostics. Such systems prove effective in analysing mammograms to aid in breast cancer screening.

But GenAI is not trained to perform a narrowly defined task. These technologies are based on so-called foundation models, which have generic capabilities. This means they can generate text, pixels, audio or even a combination of these.

These capabilities are then fine-tuned for different applications – such as answering user queries, producing code or creating images. The possibilities for interacting with this type of AI appear to be limited only by the user’s imagination.

Crucially, because the technology has not been developed for use in a specific context or for a specific purpose, we don’t know how doctors can use it safely. This is just one reason why GenAI isn’t suited for widespread use in healthcare just yet.

Another problem in using GenAI in healthcare is the well documented phenomenon of “hallucinations”. Hallucinations are nonsensical or untruthful outputs based on the input that has been provided.

Hallucinations have been studied in the context of having GenAI create summaries of text. One study found various GenAI tools produced outputs that made incorrect links based on what was said in the text, or summaries included information that wasn’t even referred to in the text.

Hallucinations occur because GenAI works on the principle of likelihood – such as predicting which word will follow in a given context – rather than being based on “understanding” in a human sense. This means GenAI-produced outputs are plausible rather than necessarily truthful.

This plausibility is another reason it’s too soon to safely use GenAI in routine medical practice.

Imagine a GenAI tool that listens in on a patient’s consultation and then produces an electronic summary note. On one hand, this frees up the GP or nurse to better engage with their patient. But on the other hand, the GenAI could potentially produce notes based on what it thinks may be plausible.

For instance, the GenAI summary might change the frequency or severity of the patient’s symptoms, add symptoms the patient never complained about or include information the patient or doctor never mentioned.

Doctors and nurses would need to do an eagle-eyed proofread of any AI-generated notes and have excellent memory to distinguish the factual information from the plausible – but made-up – information.

This might be fine in a traditional family doctor setting, where the GP knows the patient well enough to identify inaccuracies. But in our fragmented health system, where patients are often seen by different healthcare workers, any inaccuracies in the patient’s notes could pose significant risks to their health – including delays, improper treatment and misdiagnosis.

The risks associated with hallucinations are significant. But it’s worth noting researchers and developers are currently working on reducing the likelihood of hallucinations.

Patient safety

Another reason it’s too soon to use GenAI in healthcare is because patient safety depends on interactions with the AI to determine how well it works in a certain context and setting – looking at how the technology works with people, how it fits with rules and pressures and the culture and priorities within a larger health system. Such a systems perspective would determine if the use of GenAI is safe.

But because GenAI isn’t designed for a specific use, this means it’s adaptable and can be used in ways we can’t fully predict. On top of this, developers are regularly updating their technology, adding new generic capabilities that alter the behaviour of the GenAI application.

Furthermore, harm could occur even if the technology appears to work safely and as intended – again, depending on the context of use.