Withings Body Scan 2 Review: Accuracy, Evidence, and Who It Suits

A bathroom scale that claims more than 60 biomarkers, an ECG, and early warnings about blood pressure and blood sugar: which of those numbers the evidence can carry, and which it cannot carry yet.

Between 2023 and 2024, a fleet of bathroom scales in Japan, North America, and Europe quietly assembled what its researchers call the largest real-world dataset on arterial stiffness to date. Withings scales logged 38,648,329 pulse wave velocity measurements from 1,196,712 people, and the numbers traced a curve that small clinic cohorts had only hinted at: men’s arteries start out stiffer, but around the fifth decade of life women’s arteries stiffen faster and overtake them (Frontiers in Cardiovascular Medicine, 2026).

The Withings Body Scan 2 is the newest and most ambitious of those scales. Withings, a French connected-health company based just outside Paris, unveiled it at CES in January 2026 and has since launched it in the United States, where Withings styles it BodyScan 2. You step on barefoot, pull up a cabled hand grip, and in about 90 seconds it reports what Withings counts as more than 60 biomarkers, from muscle and visceral fat to an ECG, plus new warnings for high blood pressure, prediabetes, and chronic stress.

That is a great deal of promise for a device that lives next to the bathtub. Some of those numbers rest on peer-reviewed validation. Some rest on population statistics that may or may not describe you. And the newest features, the ones that most set this scale apart, have not yet been tested in published studies at all.

What Is the Withings Body Scan 2?

The Withings Body Scan 2 is a connected smart scale made by Withings that combines bioelectrical impedance body composition, an electrocardiogram, an arterial stiffness estimate, and new risk warnings for hypertension, prediabetes, and stress. It is a consumer health device, not a clinical test, and it is built to track how your body changes over time rather than to diagnose disease.

It is the second generation of a product line. The original Withings Body Scan introduced the hand grip and the idea of a scale as a “health station,” and in August 2023 the FDA cleared it for sale in the United States with ECG-based atrial fibrillation detection. The Body Scan 2 keeps that grip-and-plate concept, with a cabled handle and what reviewers describe as a premium build, and layers on software features that launch coverage described as AI-powered hypertension detection, along with prediabetes and chronic stress warnings.

Withings markets the device around longevity. Launch coverage called it a “longevity station” whose biomarkers promise to predict your future health. Underneath that language sit four familiar measurements: how much muscle and fat you carry and where; how stiff your arteries are; what your heart rhythm looks like; and how well the small nerves in your feet are working. Each has real science behind it. The question this review tries to answer is how much of that science survives the trip onto a bathroom floor.

How Does the Withings Body Scan 2 Work?

The Body Scan 2 uses electrodes under your feet and in the hand grip to run four kinds of measurement at once: a faint alternating current to estimate body composition, weight fluctuations and foot pulses to time the pressure wave from your heart, an ECG trace of the heartbeat’s electrical signal, and a small voltage that probes sweat-gland nerves.

Body composition by impedance. Muscle is mostly water laced with electrolytes, and it conducts electricity readily. Fat holds little water and resists the current. The scale sends an imperceptible alternating current through you and measures the opposition it meets, called impedance. Software then feeds that impedance, along with your height, weight, age, and sex, into prediction equations to estimate fat mass, lean mass, and water. A scale that touches only your feet sends its current up one leg and down the other, so it mostly sees your lower body and has to guess the rest. The hand grip closes a second circuit through the arms and torso, which lets the Body Scan line estimate arms, legs, and trunk separately. That is the “segmental” analysis, and it is the main reason this scale reads more like a clinic analyzer than a bathroom gadget.

Arterial stiffness from a heartbeat’s recoil. Every time your left ventricle fires blood up into the aorta, the surge and its turn through the aortic arch give your whole body a tiny recoil. A sensitive scale can see your weight flicker with each beat; the technique is called ballistocardiography. At the same time, impedance sensors in the soles detect the moment the pulse wave arrives in the arteries of your foot. The delay between those two events, the aorta-to-leg pulse transit time, combined with your height, becomes a pulse wave velocity (American Journal of Hypertension, 2017). Think of plucking a slack rope versus a taut one: the wave races along the taut rope. Stiff arteries carry the pressure wave faster, and a higher velocity means older, stiffer vessels. “Vascular age” is that velocity translated into the age at which an average person has the same stiffness, which is why Withings researchers can describe a change in pulse wave velocity as months of vascular aging gained or lost.

An ECG through hands and feet. Holding the grip while standing on the plates puts electrodes on opposite sides of your heart, so the scale can record the electrical wave that sweeps through the heart muscle with each beat. An algorithm reads the strip for the irregular, chaotic signature of atrial fibrillation. Withings has published one such algorithm, which classifies 30-second strips as normal rhythm, atrial fibrillation, “other,” or noise (Computers in Biology and Medicine, 2024).

Nerve health from sweat glands. The smallest nerve fibers in your feet, the sympathetic C fibers that drive sweat glands, are among the first to falter in small fiber neuropathy, a common complication of diabetes. Applying a low voltage to the soles draws a tiny current from those glands; that current, measured as electrochemical skin conductance, reflects how well the nerves are working. Withings brought this measurement to the first Body Scan, and it also runs on the cheaper Body Comp.

The new warnings. The hypertension, prediabetes, and stress flags are where the Body Scan 2 departs from its predecessor. The scale has no cuff and draws no blood, so these warnings must be inferred from signals it already collects. Withings has not detailed that inference in any peer-reviewed paper we could find: a PubMed search in October 2026 turned up no validation study of the Body Scan 2’s hypertension or prediabetes features.

How Accurate Is the Withings Body Scan 2? What the Research Shows

The Body Scan 2’s core sensors have published validation: its arterial stiffness method agrees acceptably with a clinical reference, its nerve measurement closely matches a hospital device, and Withings’ ECG algorithm performs strongly in company studies. Its body composition has no published DXA comparison, and its new risk warnings have no published validation at all.

Arterial stiffness. To test whether a scale could measure aortic pulse wave velocity, Withings engineers and Paris hospital researchers calibrated the method in 106 people, then compared it in a separate group of 86 against the SphygmoCor, a clinical tonometry system. The average bias was just 0.25 meters per second, but the standard error was 1.39 meters per second, an agreement the ARTERY classification rates “acceptable” rather than excellent (American Journal of Hypertension, 2017). The authors, most of them Withings employees, wrote that repeatability still needed work. Hold that 1.39 figure in mind, because it matters later.

Nerve health. The strongest independent-looking evidence for any Body Scan feature comes from Paris hospital diabetes departments. In a 2023 study of 147 patients (mean age 59, 76 percent with diabetes), the first-generation Body Scan’s foot conductance was compared with the Sudoscan, a hospital reference device. It detected at least moderate small fiber neuropathy with a sensitivity of 0.91 and a specificity of 0.97, and the two devices showed what the authors called almost perfect agreement (Frontiers in Neurology, 2023). The authors are hospital clinicians, but the abstract we reviewed does not state who funded the study. The population was also chosen for neuropathy risk; performance in healthy people screening at home may differ.

ECG. Withings’ published atrial fibrillation algorithm, tested on 4,646 strips from 1,441 participants across three Withings-sponsored clinical studies and three hardware devices, reached a sensitivity of 99.63 percent and a specificity of 99.85 percent (Computers in Biology and Medicine, 2024). Those are company numbers from company studies, and the abstract does not name the three devices tested. The FDA clearance of the original Body Scan’s ECG is the more meaningful external signal.

Body composition. Here the record is thin. We found no peer-reviewed study comparing the Body Scan or Body Scan 2 against DXA, the X-ray reference method for body composition. The closest evidence comes from other segmental, hand-and-foot analyzers. In 45 collegiate female athletes, a clinic-grade InBody 720 read body fat 3.3 percentage points lower than DXA on average, with limits of agreement of plus or minus 5.6 points, while its lean tissue estimates for arms, legs, and trunk agreed well (Journal of Strength and Conditioning Research, 2015). In 1,617 Japanese adults aged 65 to 84, an InBody 770 correlated tightly with DXA for limb muscle (r = 0.95) yet averaged 9.2 percent lower, and it would have labeled 38.1 percent of participants as having low muscle mass against 9.1 percent by DXA (Clinical Nutrition ESPEN, 2026). Simpler foot-only scales do worse: in 929 adults, a Tanita foot-to-foot scale missed DXA body fat by a root mean square error of 5.6 points in men and 4.6 in women (Obesity Research and Clinical Practice, 2022). The lesson repeats across devices: impedance is good at ranking people and following change, and it can be several points off for any one person.

What millions of readings reveal. Withings’ scale fleet is now a research instrument in its own right, and the studies it generates show what home measurement can see. During France’s strict 2020 lockdown, pulse wave velocity fell among 26,196 French scale users, a drop the researchers equated to 5.2 months of vascular age (European Heart Journal: Digital Health, 2022). Among 29,653 adults in 20 countries who used an under-mattress sleep sensor and a smart scale at home for about four years, worse sleep apnea tracked with stiffer arteries in a dose-response pattern (npj Digital Medicine, 2026). And among 2,031 US users of connected devices, the 396 who started a GLP-1 weight-loss drug lost a median 9.8 percent of body weight, mostly fat (7.5 percent) with smaller muscle loss (2.3 percent) by the devices’ own estimates (Mayo Clinic Proceedings: Digital Health, 2026). All three papers include Withings scientists, the participants were self-selected device owners, and the designs are observational. They show associations at population scale, not proof about any individual.

Read together, the evidence says something precise. The Body Scan 2’s sensors are real instruments with published, if mostly company-linked, validation. Its body composition is a credible estimate best used for trends. And its headline new features, the blood pressure and prediabetes warnings, are as yet unproven in public. For a framework on weighing claims like these, see our explainer on what “clinically validated” actually means.

What the Withings Body Scan 2 Gets Right

The Body Scan 2 gets the most important thing right: it turns several established cardiovascular and metabolic risk markers into a daily habit that takes 90 seconds. Frequency is its superpower, because many noisy readings average into a clearer trend than one precise snapshot a year.

It measures what actually predicts outcomes. Weight alone is a blunt number. Muscle, visceral fat, and arterial stiffness are sharper. In a 2010 meta-analysis of 17 studies following 15,877 people for a mean of 7.7 years, each 1 meter per second increase in aortic pulse wave velocity carried a 14 percent higher risk of cardiovascular events and a 15 percent higher risk of death from any cause, after adjusting for age, sex, and risk factors (Journal of the American College of Cardiology, 2010). Muscle tells a similar story: among 3,659 older adults in a national US survey, those in the highest quarter of muscle mass index had a 20 percent lower adjusted death rate than those in the lowest (American Journal of Medicine, 2014). That study measured muscle with bioelectrical impedance, the same physics the scale uses.

It rewards consistency. Recall that 1.39 meters per second standard error. A single scale reading can land further from the clinical reference than the 1 meter per second step the meta-analysis links to meaningful risk. A daily habit solves much of that problem: averaged over weeks, random noise shrinks and the underlying direction shows through, though no amount of averaging removes a consistent bias. The same logic applies to body fat. A scale that is a few points off but consistent will still tell you, faithfully, whether your training block added muscle.

It sees the quality of weight change. The GLP-1 study shows the value plainly. Two people can lose the same 20 pounds with very different ratios of fat to muscle, and the second number matters for strength, metabolism, and aging. A segmental scale gives you, and your clinician, a running estimate of which kind of loss is happening.

Its nerve measurement has a clinical use. For people with diabetes, a home measurement that agreed closely with a hospital neuropathy device is not a gimmick. It is an early warning for a complication that often advances silently until feet go numb.

It has an FDA-cleared heart lineage. The first Body Scan’s ECG went through FDA clearance, and Withings’ published rhythm algorithm performs at a high level in its own studies. A scale that records a rhythm strip every morning gives intermittent atrial fibrillation more chances to show itself than an annual physical does.

Where the Withings Body Scan 2 Falls Short

The Body Scan 2’s weaknesses are the gap between its marketing and its published evidence: unvalidated new warnings, body fat estimates that can be several points off, noisy single readings, research mostly authored by the company, and US regulatory status for its newest features that we could not confirm.

The newest features are the least proven. The hypertension and prediabetes warnings are the reason to buy this scale over its predecessor, and they are exactly the features with no peer-reviewed validation we could find as of October 2026. A warning with unknown sensitivity can miss real disease and reassure you falsely; one with unknown specificity can send healthy people chasing tests. Until Withings publishes performance data, treat a flag as a reason to measure properly, with a cuff such as the Withings BPM Connect or a blood test through your clinician, and treat silence as no information at all.

Body fat is an estimate, not a measurement. Impedance infers fat from water, and the equations behind it were built on reference populations that may not resemble you. Studies of comparable devices show individual errors of several percentage points against DXA. Because the method depends on body water, the most useful rule is boring: weigh in at the same time each day, under the same conditions, and watch the trend line rather than the daily number.

“60 biomarkers” overstates the independent information. Many of those values are derived from the same few signals. Vascular age is pulse wave velocity restated as an age. BMI is weight divided by height squared. Segment-by-segment fat and muscle come from the same impedance readings. The count is honest arithmetic, but it is not 60 separate windows into your health.

The evidence has a sponsor. Most of the published work on Withings scales includes Withings scientists, and the large real-world studies draw on people who chose to buy connected devices. That is common in medical technology and does not make the findings wrong. It does mean independent replication is the next thing to look for.

Regulatory clarity is missing. The original Body Scan’s FDA clearance is documented. For the Body Scan 2, we could not confirm in October 2026 which features carry US clearance and which are offered as general wellness information. Ask before you buy if a specific feature matters to your decision.

Practical limits. It is expensive, large, and only as useful as the app and network connection it syncs through. Impedance scales send current through the body, so if you have a pacemaker or another implanted electronic device, or are pregnant, read the manufacturer’s guidance before using the body composition features.

Withings Body Scan 2 vs Body Scan vs Body Comp vs DEXA

The Body Scan 2 adds hypertension, prediabetes, and stress warnings to the first Body Scan’s hand grip, ECG, and segmental analysis. The cheaper Body Comp drops the grip and ECG but keeps visceral fat and nerve health on a foot-only scale. A DEXA scan is far more accurate for body composition but measures one moment, in a clinic.

Feature	Withings Body Scan 2	Withings Body Scan (first gen)	Withings Body Comp	DEXA scan
How it measures body composition	Impedance through feet and a cabled hand grip	Impedance through feet and a hand grip	Impedance through the feet only	Low-dose X-ray
Segmental (arms, legs, trunk)	Yes, estimated	Yes, estimated	No	Yes, measured
ECG	Yes	Yes; FDA cleared in 2023	No	No
Hypertension, prediabetes, and stress warnings	Yes, new; no published validation found	No	No	No
Accuracy for body fat	Estimate; no published DXA comparison found	Estimate; no published DXA comparison found	Estimate; foot-only path	Reference standard
Best for	Daily trends across heart, muscle, and fat	Same core trends, without the new warnings	Budget daily trends	Accurate periodic benchmark

If you already own the first Body Scan, the upgrade buys you the new risk warnings and a nicer build, and the warnings are the part with the least published support. If you mainly want weight, visceral fat, and a nerve health reading, the Withings Body Comp covers much of the same ground on a foot-only scale. The best pairing for serious body recomposition is a daily scale for trend plus an occasional mobile DEXA scan to anchor it. To compare every scale and scanner we cover, browse our body composition device reviews.

How Much Does the Withings Body Scan 2 Cost, and Is It HSA/FSA Eligible?

The Body Scan 2 is the scale launch coverage called Withings’ ultra-premium model, priced well above ordinary smart scales. As of October 2026, Withings’ US store lists it at $599.95, the same price Withings gave in its US launch press release. Withings’ US product page lists it as HSA/FSA eligible.

Practically, as of October 2026: the HSA or FSA route can soften the price meaningfully, since you pay with pre-tax dollars. Insurance does not usually reimburse consumer scales. Withings has sold optional app subscriptions alongside its scales since 2022, when it introduced Health+; we could not confirm the current plan’s price or exactly which Body Scan 2 features it gates, so check what is included before you assume you need it. Weigh the total against your alternatives: a foot-only Withings scale for daily trends, or periodic DEXA scans if absolute accuracy matters more than frequency.

Who Should Buy the Withings Body Scan 2, and Who Should Skip It?

The Body Scan 2 suits people who will weigh in most days, watch trends over months, and act on what they see, ideally with a clinician. It is the wrong purchase for anyone who wants a diagnosis, a precise body fat number, or just a weight.

Good candidates:

• Adults building or protecting muscle through resistance training, especially after 50, who want a segmental trend between occasional DEXA scans.
• People on GLP-1 or other weight-loss medication who want to see whether they are losing fat or muscle, and to share that trend with their prescriber.
• People with diabetes or prediabetes who want a home nerve health reading to discuss with their care team.
• Owners of other Withings devices who want blood pressure, sleep, and body data in one history.

Better served by something else:

• Anyone who suspects high blood pressure: a validated arm cuff, used properly, is the right tool, and your clinician should confirm the diagnosis.
• People who want an accurate body fat percentage: a DEXA scan answers that far better.
• Anyone who only wants weight and BMI: a basic connected scale costs a small fraction of the price.
• People prone to anxiety over daily numbers: a weekly weigh-in on a simpler scale may serve you better.

If a warning from the scale prompts questions about blood pressure, blood sugar, or heart rhythm, the Healthcare Discovery doctor directory lists clinicians by state and specialty.

What This Means for You

Every number the Body Scan 2 tracks maps onto at least one of the Four Villains of Health and Longevity. Stiffening arteries, high blood pressure, and atrial fibrillation are the work of the Silent Assassin, cardiovascular disease. Visceral fat feeds the Energy Arsonist, metabolic dysfunction, and it reaches further than most people realize: among 3,086 Framingham Heart Study participants scanned by CT and followed for a median of five years, each standard deviation of visceral fat carried a 44 percent higher risk of cardiovascular disease and a 43 percent higher risk of cancer, the Rogue Hijacker, after adjusting for BMI (Journal of the American College of Cardiology, 2013). In a 2023 meta-analysis of 16 prospective studies and 81,358 adults, low skeletal muscle mass raised the risk of death from any cause by 57 percent (PLOS ONE, 2023).

But the scale is the measurement, not the medicine. The levers sit in the Five Pillars. Movement, above all resistance training, is the only reliable way to build the muscle the scale estimates. Nutrition, adequate protein and fewer ultra-processed calories, shapes the visceral fat it flags. Sleep matters more than most people expect: the multi-night data linking sleep apnea to stiffer arteries is a reason to take loud snoring seriously, and an under-mattress tracker such as the Withings Sleep Analyzer is one way to notice it at home. Breath and Mindset come in on the reading itself: a daily number that swings is an invitation to look at the trend, not a verdict to react to.

The first study in this review found that women’s arteries begin stiffening faster than men’s around midlife. No single morning on a scale could have shown that. It took millions of quiet, imperfect readings. That is the honest promise of the Withings Body Scan 2: not a diagnosis, and not a lifespan prediction, but a long, consistent record of the few things that most shape how you age, delivered every morning in 90 seconds.

Frequently Asked Questions

Sources

1. Vittrant B, Boutouyrie P, Bruno RM. Sex-specific trajectories of arterial stiffness: a large-scale description of 38 million real-world pulse wave velocity measurements. Frontiers in Cardiovascular Medicine, 2026. DOI
2. Campo D, et al. Measurement of aortic pulse wave velocity with a connected bathroom scale. American Journal of Hypertension, 2017. DOI
3. Riveline JP, et al. Validation of the Body Scan, a new device to detect small fiber neuropathy by assessment of the sudomotor function: agreement with the Sudoscan. Frontiers in Neurology, 2023. DOI
4. Edouard P, Campo D. Design and validation of Withings ECG Software 2, a tiny neural network based algorithm for detection of atrial fibrillation. Computers in Biology and Medicine, 2024. DOI
5. Esco MR, et al. Comparison of total and segmental body composition using DXA and multifrequency bioimpedance in collegiate female athletes. Journal of Strength and Conditioning Research, 2015. DOI
6. Nakagata T, et al. Agreement and systematic difference between bioelectrical impedance analysis and dual-energy X-ray absorptiometry for appendicular lean mass in 1617 community-dwelling older adults: the Bunkyo Health Study. Clinical Nutrition ESPEN, 2026. DOI
7. Nana A, et al. Agreement of anthropometric and body composition measures predicted from 2D smartphone images and body impedance scales with criterion methods. Obesity Research and Clinical Practice, 2022. DOI
8. Bruno RM, et al. Home monitoring of arterial pulse-wave velocity during COVID-19 total or partial lockdown using connected smart scales. European Heart Journal: Digital Health, 2022. DOI
9. Pinilla L, et al. Multi night digital assessment of sleep disordered breathing is associated with accelerated vascular aging. npj Digital Medicine, 2026. DOI
10. Chabassier M, et al. Real-world body composition and blood pressure changes following glucagon-like peptide 1 receptor agonist initiation: a causal inference study of connected device data. Mayo Clinic Proceedings: Digital Health, 2026. DOI
11. Vlachopoulos C, Aznaouridis K, Stefanadis C. Prediction of cardiovascular events and all-cause mortality with arterial stiffness: a systematic review and meta-analysis. Journal of the American College of Cardiology, 2010. DOI
12. Srikanthan P, Karlamangla AS. Muscle mass index as a predictor of longevity in older adults. American Journal of Medicine, 2014. DOI
13. Britton KA, et al. Body fat distribution, incident cardiovascular disease, cancer, and all-cause mortality. Journal of the American College of Cardiology, 2013. DOI
14. Wang Y, et al. Low skeletal muscle mass index and all-cause mortality risk in adults: a systematic review and meta-analysis of prospective cohort studies. PLOS ONE, 2023. DOI
15. Withings. Withings announces FDA clearance of its Body Scan connected health station (press release), August 2023. Withings press materials
16. Withings. BodyScan 2 US launch (press release), 2026. Withings press materials
17. Withings. BodyScan 2 US product page (price and HSA/FSA eligibility). Withings