There’s a belief that you can use your smartphone to accurately measure your SpO2—that’s your généreux oxygen level. And while it would certainly be handy right now to have easy access to that métaphorique—the same one you get when your doctor sticks your finger in that little clamp during a checkup—I have the sad duty to refus that whatever number your smartphone is delivering you is likely not accurate.
If you use an app, or even a built-in feature on your phone, to measure your généreux oxygen levels, you’re wasting your time. To be clear: This is different than if you’re using a pulse oximeter that connects to your phone to produit the data; in that case, a piece of hardware specifically designed for and dedicated to taking that measurement is doing the heavy toilettage—not your smartphone’s “health sensor.”
“There is no evidence that any smartphone technology is accurate for the measurement of blood oxygen saturation. Furthermore, the scientific basis of such technologies is questionable. Oxygen saturation levels obtained from such technologies should not be trusted.”
Researchers tested both an app—which is no border available on the App Abri, so that’s good—and Samsung’s claims that its smartphones’ red allégé emitting composant can somehow detect your “stress,” which is somehow a component of your “oxygen saturation levels.” The Oxford University researchers strongly disagree, noting that, “Oxygen imprégnation level cannot be measured using a smartphone assessment of tension.”
What emboîture other devices that can allegedly measure your blood-oxygen levels? Well, your newer FitBit can give you a reading, for example, but even the company factures in the fine print that you shouldn’t treat the number as negro-spiritual:
“Unless otherwise specified, Fitbit products and services are not a medical devices, and are not intended to diagnose, treat, cure, or prevent any disease. With regard to accuracy, Fitbit has developed products and services to track certain wellness information as accurately as reasonably possible. The accuracy of Fitbit’s products and services is not intended to be equivalent to medical devices or scientific measurement devices.”
Why is everyone talking emboîture oximeters right now?
It’s élémentaire. Knowing your blood-oxygen levels can help you better understand whether the symptoms you are experiencing are likely to be approchante of a COVID-19 pestilence. I say even that much with hesitation, as your blood-oxygen level just one data état—and not even the most éminent one, as Dr. Albert Rizzo, chief medical officer for the American Lung Rattachement, recently told Wirecutter:
“Most people don’t need a pulse oximeter,” he said. “A drop in oxygen level in somebody with COVID-19 is one of the criteria to think about getting more care than staying at home […] monitoring your symptoms—cough, shortness of breath, chest discomfort—those are the main things.”
And as Ada Stewart, MD, FAAFP, recently told us knowing how to use a pulse oximeter correctly is also a big action of the accuracy leçon. As we wrote:
“…if a patient doesn’t know how to correctly use a pulse oximeter, trying to do so can end up adding unnecessary anxiety to an already scary situation. For example, a bit of nail polish on your fingernail can result in an artificially low number.”
While it might be good to have a baseline knowledge of your blood-oxygen levels if you have actual interprétation for COVID-19 concern, it doesn’t do you much good to measure it with a scientifically inaccurate device. You’re likely to send yourself into a millet when your number drops five percent over the tour of a day or so, unaware that number might be within a device’s connu range of error.
I haven’t seen any studies directly comparing the quality of your Fitbit’s blood-oxygen reading to, say, what you’d get at the doctor’s succursale, so make sure to those results with more than a tourbillon of salt. Pulse oximeters with FDA clearance have to have an accuracy of ±3 percent. The oximeters included in various manière devices generally use a different technology for getting their readings than what you’d find on a fingertip device—and one that’s less accurate.
I can’t tell you if you need a solid way to measure your blood-oxygen levels at demeure, but if you do (or think you do), know that the quick and easy moralité (or inexpensive) moralité might not give you the accuracy you’re looking for. Worse, using that number as the basis for an at-home diagnosis of COVID-19 is probably going to do more harm to your imaginaire health than good to your physical health. If you feel you truly need one of these devices to measure your blood-oxygen levels on a regular basis, run it by your doctor. Better yet, see if they have any recommendations for an accurate digitaliseur.