Meds and you

Updated 13 October 2016

Doctors still better at diagnosis than computers

According to a study, doctors were twice as likely to get the right diagnosis on the first try as a number of symptom-checking computer programmes.

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Real doctors are still better at figuring out what's ailing someone than sophisticated symptom-checking websites and smartphone apps, according to a new study.

Complex health problems

Physicians were twice as likely to get the right diagnosis on the first try as 23 popular symptom-checking computer programmes, said senior researcher Dr Ateev Mehrotra.

The gap was widest when it came to more complex health problems, said Mehrotra, an associate professor of health care policy and medicine at Harvard Medical School.

But across the board, "the physicians performed much better in terms of diagnostic accuracy," Mehrotra said.

The study involved 234 physicians and 23 computer symptom checkers. They were presented with 45 vignettes involving hypothetical patients and were asked to determine the illness each person likely had.

Read: 16 scary symptoms

The symptom checkers included web offerings from places like the Mayo Clinic, the American Academy of Paediatrics and England's National Health Service, as well as apps for iPhone and Android smartphones, Mehrotra said.

Better for humans

Doctors provided the correct diagnosis right off the bat 72 percent of the time, compared with just 34 percent of the time for symptom-checking programmes, researchers found.

Human doctors also outperformed computers when given the chance to provide three suspected diagnoses. The correct diagnosis was in their top-three list 84 percent of the time for doctors, and 51 percent of the time for system-checking programmes.

For simpler health problems such as conjunctivitis and sinusitis, computers guessed right 40 percent of the time, compared with 65 percent of the time for physicians.

"There the differential was still better for the humans, but not as much," Mehrotra said.

But human doctors performed three times as well for very complicated health problems, getting the diagnosis right 79 percent of the time, compared with 24 percent of the time for the computer.

Read: The demon doctors

The findings appear in a letter published in JAMA Internal Medicine.

Dr John Meigs, president of the American Academy of Family Physicians, said he wasn't too surprised that human doctors are better at diagnosing health problems than computers.

Amazing amounts of data

"Physicians aren't perfect, but they have a pretty good track record," said Meigs, a family physician in Centreville, Alabama. "The diagnostic technology is great to augment care, but I do not see the day where it's going to replace us."

Meigs believes these sorts of computer programmes are best used to add to a doctor's judgment, rather than replace the doctor outright.

"Because computers can sort through amazing amounts of data, I think once you've got your diagnosis established, there are times where technology might be able to go through lots of guidelines and treatment protocols and help you sort that out," he said.

As they become more accurate, symptom-checking programmes also may be able to help people decide whether they really need to see a doctor for the problem they're fretting over, Mehrotra said.

Read: Consulting your doctor

"There are a lot of visits in the United States where a person goes to the doc, the doc says everything is fine, pats you on the back and you walk out," he said. "If the computer for some fraction of those could tell you everything's OK, then you could stay home. You wouldn't have to schlepp to the doctor, and we free up that physician's time for other stuff."

At the same time, Mehrotra won't rule out the possibility that one day computers will be able to diagnose patients as well as a doctor.

"Maybe 10 or 20 years ago, I wasn't sure that I should trust a computer to do my taxes," he said. "Now I turn to it every year."

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Electronic diagnosis under fire

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