While online medical tests may give you some information about various conditions, they should not be used alone as a diagnostic tool, according to the U.S. National Library of Medicine. It is the recommendation of USA.gov to always seek the advice of a qualified health professional.
The National Institutes of Health recommends that health websites sponsored by federal government agencies are good sources of information. While some health websites may provide reliable information, others may be hosted by individuals who have no specific medical training or are solely seeking to make a profit, without ethical considerations, explains the National Institute on Aging. The NIA states that the most reliable health websites typically have references to where the information was sourced, are often affiliated with an approved medical body, and provide easily locatable contact information.