Risks vs Benefits
DTC testing is not an answer to the national shortage of rheumatologists, however, especially given the risks that Dr. Niewold, Dr. Putman, and Dr. Kim worry outweigh potential benefits. On the one hand, getting online test results may help expedite a referral to a specialist, Dr. Niewold said. But a long wait for that appointment could then easily become a bigger source of anxiety than comfort, Dr. Putman said.
“It’s a trade-off where you are accepting a lot more people getting false-positive diagnoses and spending months thinking they have some disease where they might not, in exchange for a couple people who would have had a delayed diagnosis,” Dr. Putman said. “There’s an enormous amount of existential suffering,” that’s familiar to rheumatologists because some patients may dread the diagnosis of a rheumatic disease the way they might fear a cancer diagnosis, especially if they have lost a family member to a condition that they suspect they share, he said. “To put yourself into an existential catastrophe — that’s not a small harm.”
Dr. Niewold agreed, pointing out that patients with a positive ANA test may “get unnecessarily worried and stay up all night reading about lupus, getting scared for weeks on end before seeing a specialist.” And there are financial harms as well for patients who may order the same test multiple times, or a whole slate of tests, that they don’t need for hundreds or thousands of dollars. There’s also the lost time and effort of researching a condition or even seeking out support groups that patients may pursue, Dr. Niewold said.
The likely biggest risk to individuals, however, is the potential for overdiagnosis or misdiagnosis.
“If someone comes in and they’ve read the textbook on lupus and they have a positive ANA, it’s really hard as a rheumatologist to walk that back,” Dr. Putman said. “The human mind is a powerful thing,” he added, and people who get a positive test will likely start to notice things like joint pain or a rash on their cheeks and begin attributing it to a diagnosis they risk convincing themselves they have. “When people come into your clinic not knowing what a disease would look like and they just tell you how they’re feeling, it’s a much cleaner and more honest way to approach diagnosis.”
Most patients likely don’t realize, for example, that none of the tests rheumatologists usually order are diagnostic in and of themselves, Dr. Niewold said. “They’re all kind of like stars in the constellation of a diagnosis,” he said. “They’re helpful, but none of them is sufficient by itself.”
Dr. Killeen agreed, noting that “consumers might not understand the nuances of these tests well enough to know whether it is appropriate to order them or how to interpret the results correctly.” Given the long-term implications of a diagnosis for a rheumatologic disease, “I would have concerns about consumers ordering and interpreting rheumatologic tests without working closely with their physicians,” Dr. Killeen said. “The main concern that lab experts have about direct-to-consumer tests is the potential for people to get misleading results and/or to misinterpret their results, which in turn could lead to people not getting the treatment they need or getting treatment when they don’t need any at all.”
It’s one thing for patients to come in asking for a particular treatment they may not need but which a doctor may be able to dissuade them from seeking. But Dr. Kim also pointed out the risk that patients may decide to treat themselves with therapies that haven’t undergone rigorous testing or haven’t been recommended by a physician.
“We tend to have people who come in with a pretty clear idea of what they want done, but the problem is, we don’t know if their reasoning is correct from a clinical perspective,” Dr. Kim said. Companies offer these tests with the belief that they’re “providing patients a choice, an option to take ownership,” he said, “but the potential harm can be realized very quickly because there are going to be people who are misdiagnosing themselves and, worse yet, may then pursue their own treatment plan that’s going in the opposite direction of where we think it needs to go.”
Or, on the flip side, if a patient erroneously believes they have the answer to what ails them, it may delay diagnosis of a more serious condition that’s rarer or harder to detect. Kim pointed to, for example, intravascular lymphoma, which is notoriously as difficult to identify as it is rare and aggressive. If a patient’s confirmation bias has led them to believe they have an autoimmune condition, they may not receive the more serious diagnosis until it’s advanced too far to treat.