The blood pressure numbers on the Happy Ring are FDA-cleared for adults aged 22 to 50 who don’t have atrial fibrillation and aren’t pregnant. Inside that group, the ring gives systolic and diastolic readings in mmHg with no cuff to calibrate it first. The clearance is dated September 3, and Happy Health added the readings to its app later that month.
The app shows an average of many readings taken while you sleep, which goes a step beyond the single spot checks the FDA cleared.
Software that needs no cuff
The FDA lists the cleared product as software called the Happy Health Blood Pressure Monitor. It reads four kinds of signals from the Happy Ring, worn on the index finger: pulse, skin temperature, motion and the skin’s electrical activity. From those it works out your blood pressure.
It needs no cuff reading and no age, height or weight to get started. Aktiia’s G0 wrist monitor, the device the FDA compared it with, needs a cuff calibration every 24 hours.
Under the clearance, the software is for “measurement and display” and makes no diagnosis, so a high reading is something to take to a doctor.
Who the clearance covers
The readings are cleared for spot checks at home or in a clinic, in adults aged 22 to 50. The FDA summary rules the software out in these cases:
- an irregular heart rhythm such as atrial fibrillation
- severe vascular disease, or a radial-artery problem such as Raynaud’s syndrome
- essential tremor, a condition that makes the hands shake
- treatment with vasoactive drugs
- pregnancy
It also isn’t meant for readings taken while you move, or when blood flow to the finger is weak.
Vasoactive drugs are medicines that widen or narrow blood vessels, and the summary doesn’t name any. Many blood pressure medicines work on the blood vessels. If you take one, ask the doctor who prescribed it whether the ring’s readings apply to you.
The overnight average in the app
Happy’s help center announced the feature on September 25. Members of Happy Sleep, the company’s sleep-care service, now see an “average overnight blood pressure” next to their sleep data. Happy builds it from many individual readings taken through the night.
The FDA summary clears spot-check readings, and its accuracy test compared single readings with a reference measurement. By our reading, the overnight average is made of cleared readings, but the accuracy figures describe one reading at a time.
Happy’s help article doesn’t mention the age range or the conditions above, and Happy hasn’t said whether members over 50 see the readings.
The same article promises heart health risk assessments and care for high blood pressure “in the coming months,” built on the data members collect now.
Accuracy in an arterial-line test
Happy tested the software on 85 adults of different ages, blood pressures, ring sizes and skin tones. Each ring reading was compared with an arterial line, a thin tube placed in an artery that measures pressure directly. That gave 850 paired readings.
For systolic pressure, the top number, the ring’s readings averaged less than 1 mmHg away from the arterial line. For diastolic pressure, the bottom number, the average gap was about a tenth of a point.
Single systolic readings scattered more widely, with a standard deviation of about 6 mmHg in their errors. One reading could miss by several points in either direction, even though the misses balanced out on average. The results met the international standard for testing automated blood pressure monitors, the FDA summary says.
Getting a Happy Ring
Happy sells the ring, a Class II medical device, through Happy Sleep, its home sleep-test service, with a prescription from one of its doctors. You can’t pick one up in a store.
The route starts with a virtual visit and up to five nights of testing at home. Afterward you keep the ring, with a year of nightly sleep tracking included and no subscription required. Happy’s checkout page now lists nightly blood pressure monitoring as part of that package.
Happy bills most major insurance plans or takes self-pay, and it lists 48 US states where it operates. Its FAQ says insurance generally covers the visits and testing for people diagnosed with sleep apnea who have symptoms.
Pixel Watch trends give no number
Google’s blood pressure trends on the Pixel Watch 3 and later work differently. Once a month they report High, Not high or Not enough data, with no real-time reading. Google calls them general wellness and says they don’t screen for hypertension.
If you’re 22 to 50 and none of the exclusions fit, the Happy Ring gives you a blood pressure figure in mmHg with an FDA clearance behind it. Expect to get it through a sleep-test visit with one of Happy’s doctors.
