Online medical symptom checkers are only accurate about one-third of the time in the first diagnosis, according to a Harvard Medical School study reported by CBS News and NPR News in 2015. The accuracy percentages rise with a greater number of suggestions.
About half of the online medical symptom checks include the right diagnosis among the top three suggestions, while two-thirds of the checks include the right diagnosis within the top 20 suggestions. However, getting advice as to whether to see a doctor quickly is more important than the diagnosis. The broad range of diagnoses given by symptom checkers may lead patients to seek unnecessary care, notes NPR News.