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(718) 218-4791info@briyahealth.comA plain-language guide to 3D and infrared body scanning: how scanners work, what they measure and estimate, how accurate they are, how to prepare, safety, privacy and what your results mean.
Medically reviewed by Jonathan Paul Navar, MD, and David Kotlarsky, PA-C, with the Briya Health medical team.
A 3D body scan is a non-contact measurement that builds a digital 3D model of the outside of your body using light and cameras. Software takes circumferences, lengths and volumes from the model and uses equations to estimate body composition, such as body fat percentage and lean mass.
Most scanners project invisible near-infrared light onto your body and use depth cameras to measure the distance to thousands of points on your skin. On a turntable scanner you stand still while the platform rotates you through a full circle. Software joins the points into a 3D surface model and measures it.
Infrared body mapping is 3D body scanning that uses near-infrared light to sense depth. The infrared light simply lets the camera measure distance. It is not thermal imaging and does not detect body heat, inflammation or circulation.
It directly measures the shape of your body's surface: circumferences such as waist, hips, chest, arms, thighs and calves, plus lengths, total and regional body volume and surface area. Many devices also report estimated body fat percentage, fat mass, lean mass and visceral fat, and ratios such as waist-to-hip ratio.
A scale gives one number, your total weight. A 3D scan shows where your size and shape are changing. For example, it can show a smaller waist even when your weight has not changed, which can happen when you lose fat and gain muscle at the same time.
Body fat scales use bioelectrical impedance analysis (BIA), which sends a small electrical current through the body. BIA readings can shift with hydration, recent meals and exercise. A 3D scan uses light instead of electricity and estimates composition from body shape. Neither method measures fat directly, and their numbers often differ.
Styku is a commercial 3D body scanner made by a Los Angeles company founded in 2011. You stand on a turntable that rotates you in front of an infrared depth sensor for about 30 to 40 seconds. Its software reports circumferences and estimates body composition. Its current S100X model uses an Intel depth sensor; the original S100 used a Microsoft Kinect sensor.
For shape measurements such as waist and hip size, yes, when scans are done carefully. Repeat measurements usually agree within about half a centimeter to 2 centimeters. For body fat percentage, accuracy is moderate. Research-grade studies against reference methods show individual errors of roughly 3 to 6 percentage points, and some devices consistently read too high or too low.
No. DEXA directly measures how much X-ray energy different tissues absorb, so it can separate fat, lean tissue and bone. A 3D scan estimates composition from surface shape. The best 3D scanners agree closely with DEXA for fat mass and lean mass across groups of people, but individual results can differ by several kilograms or percentage points.
In a 2022 peer-reviewed study of 188 adults, Styku's estimates of fat mass and fat-free mass agreed strongly with DEXA (concordance about 0.95 to 0.97), with average differences of about 1.2 to 1.3 kg. Agreement for body fat percentage was weaker (about 0.86). A 2021 study of 194 young adults found Styku overestimated body fat by about 4 to 5 percentage points compared with DEXA and a four-compartment model.
Not directly. Visceral fat sits around the organs, deep inside the abdomen, and a surface scanner cannot see it. Some scanners estimate visceral fat from belly shape using equations built against DEXA. In research, these estimates track DEXA moderately well across groups (R² about 0.67 to 0.75), but they are less reliable for any one person.
No. Bone density requires a test that can see inside the body, such as a DEXA bone density scan. Some scanners report an estimated bone mass, but that is a prediction from body size, not a measurement of bone strength. It cannot diagnose osteoporosis.
Every device uses its own sensor, its own landmarks for where to measure, and its own private equations. Studies show different scanners give different body fat numbers for the same person, and even different DEXA machines disagree by a few percentage points. Compare results only from the same device and the same software version.
Repeat scans on the same device are quite consistent, which makes them useful for tracking change. In one Styku study, the smallest change in body fat that could be trusted between days was about 2 percentage points, and most circumferences needed to change by less than 2 cm to be a real change. Smaller shifts may be measurement noise.
Yes, unintentionally or on purpose. Loose clothing, slouching, holding your breath, bunched hair, moving during the scan or standing differently from last time can all change the results. Styku's own support material says slouching or loose clothing can change body fat results. Standard clothing and posture give the most useful comparisons.
Yes, for nearly everyone. The scanners use near-infrared light, which is non-ionizing, so there is no X-ray radiation. The depth cameras used in these devices are Class 1 laser products, the lowest-risk class, meaning they are considered safe under normal use. The scan does not touch you or send current through your body.
It uses light, not ionizing radiation like X-rays or CT scans. Near-infrared light is the same broad type of light used in TV remote controls. DEXA, by comparison, uses a very small dose of X-rays, about 4 to 5 microsieverts for a whole-body scan, which is around half a day of natural background radiation.
Styku states its scan is safe during pregnancy, and Fit3D states pregnancy is not affected by its scan, because both use only infrared light. However, body composition equations are not built for pregnancy, so fat and lean estimates during pregnancy should not be relied on. Talk with your prenatal clinician before using results to guide any decisions.
Manufacturers state that pacemakers and implants are not affected, because the scanner uses light and sends no electrical current through the body. This is one difference from many BIA devices, which are often not recommended for people with pacemakers.
Research has tested 3D scanning in children and teens. The Shape Up! Kids study of 181 children aged 5 to 17 found good agreement with DEXA for fat mass and lean mass. Commercial devices may be different: Styku says its body composition results are validated only for adults 18 and older. Growth should be interpreted by a pediatric clinician.
No. You stand still in form-fitting clothes while the device scans you. Nothing touches your body except the floor of the platform, and there are no needles, electrodes or water.
Wear tight, form-fitting clothing, such as compression shorts or bike shorts and a sports bra or a fitted top, or fitted underwear. Remove shoes, jewelry, watches and anything in your pockets. Tie long hair up above the neck and shoulders so it does not cover the neck or upper back.
No. The scanner maps whatever surface the light hits. Loose or thick fabric is measured as if it were part of your body, which makes circumferences and body fat estimates read higher. This is why tight clothing is required.
The scan itself usually takes about 30 to 40 seconds on a turntable scanner. Some booth scanners capture the body in a fraction of a second. Results are typically ready within a few minutes. Most of an appointment is spent changing clothes and reviewing results.
Wear the same tight clothing each time, use the restroom first, avoid a large meal right before, and scan at about the same time of day under similar conditions. Stand in the position the operator shows you, breathe normally and stay still. Consistency between scans matters more than any single rule.
There is no medical standard. Because real change in body shape and composition takes weeks, many programs scan every 4 to 8 weeks. Scanning more often mainly measures day-to-day noise. Since there is no radiation, frequency is limited by usefulness and cost, not safety.
Most scanners show a 3D avatar that you can rotate, along with measurements. Some can overlay two scans to show where shape changed. If seeing the model is uncomfortable, you can ask the operator to show only the numbers.
U.S. guidance from the National Heart, Lung, and Blood Institute says a waist over 40 inches for men or over 35 inches for women raises the risk of heart disease and type 2 diabetes. Some groups, including many Asian populations, have lower cutoffs. A UK guideline also suggests keeping your waist less than half your height.
The World Health Organization uses a waist-to-hip ratio of 0.90 or more for men and 0.85 or more for women as a marker of substantially higher risk of metabolic problems. A 3D scan calculates this ratio automatically from its waist and hip measurements.
No. A 3D scan gives measurements and estimates, not a diagnosis. Waist size and waist ratios are useful risk markers, but conditions such as diabetes, heart disease or obesity-related illness are diagnosed by a clinician using an exam and tests such as blood work.
It can add to BMI, not replace a medical assessment. BMI cannot tell fat from muscle. A 2025 Lancet commission recommended confirming excess body fat with at least one body measurement such as waist size, waist-to-hip ratio or waist-to-height ratio, or with direct fat measurement. A scan provides these measurements quickly.
A scan does not cause weight loss. It can help you see whether your shape and estimated composition are changing, which some people find motivating. One small study also found that body image scores dipped slightly after a measurement session, so it is worth knowing how you tend to react to seeing your results.
Prices are set by each gym or clinic. Styku reports that operators who charge per scan average about $50, and several U.S. facilities list single scans at around $50. Some memberships include scans. For comparison, one university lab lists a full-body DEXA at $75 and a BOD POD test at $55.
Not in general. Styku's terms of service state that its scanner is not approved by the U.S. Food and Drug Administration, should not be considered a medical device, and gives results for informational purposes only. Treat claims that a body scanner is "FDA-cleared" with caution and ask for the clearance number.
It depends on who scans you. HIPAA, the federal health privacy law, applies to health plans, clearinghouses and most health care providers that bill electronically, plus their business associates. A gym or fitness studio is usually not covered. Ask where your scan is stored, who can see it and how to delete it.
Yes, in a limited way. Several phone apps build a 3D model from photos taken with your phone. In one study, a phone-photo method estimated body fat within about 2 percentage points of DEXA on average. Home turntable devices have mostly disappeared: Naked Labs shut down its service in 2023, and Amazon ended its Halo body scan the same year.
3D body mapping, also called 3D body scanning or 3D optical scanning, uses light to build a digital model of the outside of your body. Most scanners use near-infrared light, which is invisible to the eye. Software then takes measurements from the model and uses formulas to estimate body fat and lean mass.
3D body mapping is a way to measure the human body without touching it. A scanner shines a pattern of near-infrared light onto the body and uses one or more cameras to measure how far away each point on the skin is. Thousands of these points are joined into a 3D model, sometimes called an avatar. Software then measures the model the way a tailor or nurse would use a tape measure, but at many more places and in a few seconds.
The word "infrared" describes the light the scanner uses, not what it measures. Infrared body mapping in this sense is different from thermal imaging, which detects heat coming off the body. A 3D body scanner does not take your temperature or look for heat patterns. It uses infrared light only because that light is invisible, works in normal room lighting and is easy for depth cameras to detect.
It helps to think of a 3D scan as doing two separate jobs.
This difference matters. When a scan says your waist is 34.2 inches, it measured it. When the same scan says your body fat is 27%, it estimated it. Estimates carry more error, and they depend on whose equation the device uses.
You may see this technology called 3D body scanning, 3D optical imaging (3DO), 3D body composition scanning, 3D anthropometry or infrared body mapping. Brand names include Styku, Fit3D, Size Stream and Bodygee. Phone apps such as those built on Prism Labs technology use the same general approach with a phone camera.
Every 3D body scanner has the same basic goal: find the exact position of thousands of points on the surface of the body, then join them into a model. Scanners differ in how they measure depth, how they capture the whole body and what their software does with the result.
A normal camera records color and brightness but not distance. A depth camera adds distance. Three main methods are used in body scanners.
All three methods use near-infrared light because it is invisible, does not bother the person being scanned and is not washed out by normal indoor lighting. The light only reaches the surface. It does not pass through skin or clothing in a way that lets the scanner see inside the body.
A single depth image only shows one side of the body. To capture the whole body, a scanner collects many depth images from different angles. Styku's original scanner, for example, captured about 850 depth images as the person rotated on its turntable.
Software then:
Each step involves choices. Two scanners can disagree on a waist measurement simply because their software places the waist at a slightly different height. Researchers have pointed to landmark placement as a main source of differences between scanners and tape measures.
Some marketing blends 3D scanning with other infrared technologies. To be clear:
People have measured the body for health for nearly two centuries. 3D scanning is the latest step in a long search for measurements that are accurate, safe, quick and affordable.
In 1832 the Belgian statistician Adolphe Quetelet observed that in adults, weight tends to rise with the square of height. That ratio became the basis of the body mass index (BMI). The name "body mass index" came much later, in 1972, from the physiologist Ancel Keys. BMI is cheap and simple, but it cannot tell fat from muscle or show where fat is stored.
In 1942 researchers led by Albert Behnke published work using body density, measured by weighing people underwater, as an index of fatness. Because fat is less dense than lean tissue, a person with more fat weighs less underwater for their size. In 1961 and 1963, William Siri and Josef Brožek published the equations still used to convert body density into body fat percentage. Underwater weighing was accurate enough to become a research reference, but it needs a water tank, trained staff and the ability to breathe out fully underwater.
Skinfold calipers pinch a fold of skin and the fat under it at set sites on the body. In 1974 John Durnin and Jean Womersley published widely used equations based on measurements in 481 men and women. Calipers and tape measures are cheap and portable, but results depend heavily on the skill and consistency of the person measuring.
These methods improved accuracy, but they produce numbers rather than a picture of the body's shape, and some need specialized equipment or a small dose of radiation.
Whole-body laser scanners appeared in the 1990s, mainly for the apparel, military and car industries. The CAESAR project of the late 1990s used 3D surface scanning to survey the body shapes of thousands of civilians in North America and Europe. In the 2000s, the SizeUSA survey, run by the company [TC]2, scanned more than 10,000 people in 12 U.S. cities to update clothing sizes. These scanners were accurate but large and expensive.
Microsoft released the Kinect for Xbox 360 on November 4, 2010. It sold about 8 million units in its first 60 days. The Kinect put a low-cost infrared depth camera into millions of homes, and researchers and start-ups quickly adapted it to measure bodies. Styku, founded in 2011, joined Microsoft's Kinect Accelerator program in 2012 and built early scanners around Kinect sensors. A newer time-of-flight Kinect followed in 2013 to 2014. Microsoft stopped making Kinect for Xbox in October 2017 and ended production of its Azure Kinect developer kit in 2023. Scanner makers moved to other depth cameras, such as Intel's RealSense line.
During the 2010s, turntable scanners such as Styku and Fit3D spread into gyms, wellness clinics and weight management programs. Researchers began testing whether these devices could estimate body composition, not just measure shape. The largest effort, the Shape Up! studies led by scientists at the University of Hawaiʻi Cancer Center, Pennington Biomedical Research Center and the University of California San Francisco, scanned hundreds of adults and children alongside DEXA and other reference tests. Their work, described later in this guide, built and tested equations for fat, lean mass and visceral fat.
The newest step uses ordinary phone cameras. Amazon's Halo service, launched in 2020, offered a body fat estimate from phone photos; a 2022 study by Amazon researchers reported it estimated body fat within about 2 percentage points of DEXA on average. Amazon discontinued Halo in July 2023. Other companies continue to offer phone-based body scanning to apps and fitness platforms. The home turntable maker Naked Labs ended its service on October 31, 2023.
A 3D scan report usually mixes three kinds of results. Knowing which is which helps you decide how much weight to give each number.
These are the strongest parts of a 3D scan. Studies comparing scanners with careful tape measurements and with other volume methods show very close agreement across groups of people. In one early study of a Fit3D scanner, scanner volume agreed with reference volume with an R² of 0.99, and waist and hip circumferences agreed with tape measurements with R² values of 0.95 and 0.92.
These are simple math on measured values, so they are as accurate as the measurements behind them.
These numbers come from equations, not from seeing inside the body. They are the least certain part of the report, and they are where different brands disagree most.
The most useful health information from a 3D scan often comes from simple measurements rather than the body fat estimate. Where fat is stored matters. Fat carried around the waist, especially visceral fat, is more closely linked with type 2 diabetes, heart disease and high blood pressure than fat carried on the hips and thighs.
The National Heart, Lung, and Blood Institute (NHLBI) says a waist size of more than 40 inches for men or more than 35 inches for women raises the risk of heart disease and type 2 diabetes. NHLBI describes measuring just above the hip bones, right after breathing out.
The International Diabetes Federation uses lower cutoffs for some groups. For people of European background, it uses 94 cm (about 37 inches) or more for men and 80 cm (about 31.5 inches) or more for women. For South Asian and Chinese populations it uses 90 cm (about 35.4 inches) for men and 80 cm for women.
The World Health Organization treats a waist-to-hip ratio of 0.90 or more in men and 0.85 or more in women as a sign of substantially increased risk of metabolic complications.
The UK's National Institute for Health and Care Excellence (NICE) advises people to keep their waist to less than half their height. That is a waist-to-height ratio under 0.5. NICE notes this simple rule applies across sexes and ethnic groups for adults with a BMI under 35.
ABSI was introduced in 2012 by Nir and Jesse Krakauer. It compares waist size with what would be expected for a person's height and BMI. In U.S. national survey data from 14,105 adults followed for about five years, each standard-deviation increase in ABSI was linked to a 33% higher risk of death. ABSI is mainly a research tool, but some scanners report it or similar indexes.
In January 2025, a commission published in The Lancet Diabetes & Endocrinology recommended that doctors stop relying on BMI alone to judge excess body fat. It advised confirming excess fat with at least one body measurement, such as waist circumference, waist-to-hip ratio or waist-to-height ratio, in addition to BMI, or with direct fat measurement such as DEXA. A 3D scan can provide those measurements, but any diagnosis still belongs to a clinician.
The most important question about any body scanner is how close its numbers are to the truth, and how much they bounce around from scan to scan. These are two different ideas.
A scanner can be precise but not accurate: it may read 4% too high every time but do so consistently. For tracking change, precision matters most. For comparing yourself with health guidelines, accuracy matters more.
Repeatability is the strongest result in the research.
What this means for you: changes of a centimeter or two in a circumference, or one or two points of body fat, can be measurement noise. Look for changes that are larger or that hold steady across several scans.
Scanners are often marketed for tracking progress, so researchers have tested whether they measure change correctly.
The Shape Up! Kids study scanned 181 children and teens aged 5 to 17. Scanner-based equations predicted DEXA fat mass with R² of 0.96, fat-free mass with 0.98 and body fat percentage with 0.83. These were research equations. Commercial scanners may use different equations, and some are validated only for adults.
In the 634-adult Shape Up! study, accuracy did not differ by age. It did differ for people who were underweight and for some groups, including Asian and Black women and Native Hawaiian and Pacific Islander participants. Equations built mostly on one population may not fit everyone equally well. Several studies also found proportional bias, meaning the error changes with how much body fat a person has. In the 2021 Styku study, the scanner tended to overestimate fat in leaner people and underestimate it in people with more fat.
A 2026 study of 99 adults scanned the same people on three DEXA machines and with Size Stream's phone app, which builds a 3D model from two photos. Average body fat was 36.4% on one Hologic DEXA model, 35.2% on a GE DEXA, 34.4% on another Hologic model and 33.3% on the app. Whether a scanner looks "accurate" partly depends on which DEXA it is compared with. This is one reason no body composition number should be treated as exact.
Some marketing materials for body scanners cite studies that cannot be found in any research database, or describe real studies inaccurately. When you see an accuracy claim, look for a named study with authors, a journal and a year. Company white papers are useful but are not peer-reviewed. Styku's own pilot study, run with Pennington Biomedical Research Center in 246 people, reported strong fit between its equations and DEXA (for example, R² of 0.93 for women's fat mass), but those figures describe how well the equation fit the same people it was built on, not an independent test.
Many companies make 3D body scanners. The facts below come from the companies themselves and from published research. Product features change often, so check the maker's current information.
Fit3D's ProScanner is a turntable scanner in which a sensor tower captures the body as the platform rotates, taking about 40 seconds. Fit3D scanners were used in the large Shape Up! research studies, which makes them among the best-studied devices for body composition. The company states its scanner uses a Class 1 laser and that pregnancy, implants and pacemakers are not affected by the scan. Its recommended weight limit is 450 pounds.
Size Stream made booth scanners that capture the whole body almost at once and were used in apparel and research. Its SS20 model was one of the four scanners in the Tinsley 2020 study, and a custom equation built for it performed well against the 4C model. The company now also offers phone-based scanning that builds a model from front and side silhouette images.
Naked Labs sold a home scanner made of a mirror and a rotating scale. It was included in the Tinsley 2020 and VanSumeren 2022 studies. The company ended its service on October 31, 2023.
Several companies offer scanning through an app. Prism Labs, for example, provides 3D body composition from a phone or tablet camera to fitness and weight-management platforms. Amazon's Halo offered a phone-photo body fat estimate from 2020 until the service was discontinued on July 31, 2023. A 2024 study of 46 adults found that phone apps and traditional scanners had similar repeatability for circumferences (about 0.9% to 1.5% technical error).
The UK company Select Research developed Body Volume Index (BVI), which compares abdominal volume with total body volume, in collaboration with Mayo Clinic researchers. In a 2024 Mayo Clinic study, an AI model combined with a 3D body volume scanner predicted metabolic syndrome better than BMI or waist-to-hip ratio. This is an active research area rather than routine clinical care.
No single method is best for every purpose. Here is how the common options compare.
Gyms and trainers use scans to track changes in body shape and to show changes that a scale cannot, such as a smaller waist with stable weight during strength training. Repeatable circumference and volume data are the most reliable outputs for this use.
Weight-loss and nutrition programs use scans to track changes in waist size and estimated fat mass. Research shows scanners can follow fat-mass change reasonably well across groups, but individual body fat percentage changes should be read with the measurement noise in mind.
Researchers use 3D scanning to study body shape in large populations, to build better equations for estimating body composition, and to explore whether shape can predict health risks such as metabolic syndrome. The Shape Up! studies also found that 3D shape related to insulin levels and leg strength, though more weakly than to body fat.
Because waist size and waist ratios are established risk markers, some clinics and employer wellness programs use scans as a quick way to record them. A scan can flag a high waist measurement, but it cannot diagnose diabetes, heart disease or any other condition.
3D body scanning began in the clothing, military and car industries, and it is still used to design sizing systems, uniforms, seats and protective gear.
Some scanners report posture or left-right differences. These features are less studied than circumferences and body composition. They can prompt a conversation, but they are not a substitute for an exam by a physical therapist or physician.
3D body scanners use near-infrared light, which is non-ionizing. That means it does not have enough energy to damage DNA the way X-rays can. Depth cameras such as Intel's RealSense line are certified as Class 1 laser products under the international standard IEC 60825-1, the class considered safe under all normal conditions of use. Styku describes its sensor as a Class 1 laser that emits infrared light similar to a TV remote control.
The scan does not touch you, does not pass an electric current through you and does not involve water, needles or compression.
Styku states that its scanner is safe during pregnancy and for people with pacemakers. Fit3D states that pregnancy, implants and pacemakers are not affected by its scan. Even so, body composition estimates are not designed for pregnancy, when shape changes are expected.
Seeing a detailed 3D model of your own body can be uncomfortable. In a small 2023 study, participants' body image scores dropped slightly after a body composition measurement session. If you have a history of body image concerns or an eating disorder, talk with your care team before scanning, or ask the operator to share only the measurements you need.
Clothing, posture and conditions on the day all affect results. These steps help make your scans more accurate and easier to compare.
A 3D scan creates a detailed image of your body plus health-related measurements. Before scanning, ask:
HIPAA protects health information held by health plans, health care clearinghouses and health care providers that conduct certain transactions electronically, along with their business associates. Many gyms, studios and spas are not covered by HIPAA, so their privacy policy is what governs your data. Some state privacy laws may also apply.
Many 3D body scanners are sold for fitness and wellness rather than as medical devices. The U.S. Food and Drug Administration's general wellness guidance, most recently revised in January 2026, covers low-risk products intended for general fitness and well-being that do not claim to diagnose or treat disease. Styku's terms of service state that its scanner is not FDA-approved and should not be considered a medical device. If a business describes a body scanner as "FDA-cleared", ask for the 510(k) clearance number so you can check it.
Prices for 3D scans are set by each facility. According to Styku, about 65% of businesses that use its scanners charge per scan, at an average of about $50, and some include scans in memberships or programs.
For comparison, prices for other methods also vary by location. As examples, Boise State University's Human Performance Lab lists a full-body DEXA scan at $75 and a BOD POD test at $55. The University of Virginia's Exercise Physiology Core lists community BOD POD testing at $197.
Research points to several likely developments.
3D and infrared body mapping uses invisible light to measure the shape of your body in under a minute, without radiation. Its measurements of waist, hips and other circumferences are precise and closely match careful tape measurements, and they connect to well-established health risk markers.
Its body composition numbers are estimates. The best scanners agree well with DEXA for fat mass and lean mass across groups, but body fat percentage for any one person can be off by several points, and some devices are consistently biased. Visceral fat and bone estimates are weaker still.
Used consistently on the same device, 3D scanning is a safe and practical way to track changes in body shape. It works best alongside, not instead of, care from a licensed clinician.
This guide is for general education only. It is not medical advice and does not replace care from a licensed health professional who knows your history. Body scan results are estimates and should not be used to diagnose any condition. Talk with your clinician before making health decisions based on scan results. If you have a medical emergency, call 911 or go to the nearest emergency room.
Last reviewed: October 5, 2026.
This guide draws on peer-reviewed studies, government health agencies, international health guidelines, university research labs and scanner makers' own published information. Company claims are labeled as such. Every link was opened and checked on October 5, 2026.