Book your test.
Know your body.
DEXA Body Composition Scan, VO2 Max Test, and RMR Test — available in one visit. The data that helps inform how you train, eat, and live.
Take our 60-second quiz and we'll suggest the right test — or bundle — for your goals.
Take the quiz →vs. 8–15% error on smart scales
lean mass — not fat
least-fit and most-fit groups*
and measured RMR
Choose your test
Book individual tests
or combine them.
Each test delivers a specific, detailed insight. Most clients combine 2–3 tests in a single visit for a fuller picture of their body composition.
DEXA Body Composition Scan
A gold standard for body composition. Measures fat mass, lean mass, and bone density — by region, with approximately ±2% accuracy. See what your body is made of, not just how much it weighs.
~8 min Get DexaFit BostonVO2 Max Test
One of the most studied markers of cardiorespiratory fitness and longevity. Walk or run on a treadmill wearing a mask while we measure your aerobic ceiling — so you can track it over time.
~20 min Get DexaFit BostonResting Metabolic Rate (RMR) Test
Formula-based calculators can differ from your measured metabolism by up to ±20%. Breathe into a mask for 15 minutes and get a measured caloric baseline — useful context for your own nutrition planning.
~15 min Get DexaFit BostonBlood Lab Tests
Add a blood panel to your visit for a fuller set of biomarkers alongside your body composition data. Panels are processed through a third-party laboratory.
Quick draw Get DexaFit BostonFull Baseline
DEXA Body Composition Scan + VO2 Max Test + RMR Test in a single appointment. A complete picture of your body composition and fitness in one visit. A great starting point if you want a full baseline to track over time.
Get DexaFit Boston
How it works
Simple. Fast. Precise.
From booking to understanding your results — here's what to expect.
Choose your appointment
Select one test or combine multiple in a single appointment. Not sure which? Take our 60-second quiz first.
Pick a date and time
Find a slot that works for you. Most tests take 8–20 minutes. Arrive fasted per your test's prep guide.
Secure your booking
Confirm your appointment online. Your report presents every number in context, so you can see what it means and track it over time.
What our clients say
Rated 5.0 ★ on Google.
"I'd been tracking my weight for years and getting nowhere. The DEXA showed me the breakdown of fat versus muscle. That single insight changed how I think about my training. Loved how clear the report was."
"Getting my VO2 Max number was eye-opening — it gave me something concrete to work toward. I finally had a real baseline to improve from. The whole visit was quick and easy."
"I wanted to track my body composition while on a GLP-1, and the DEXA gave me a clear breakdown. It's now part of my routine every few months. Friendly staff and an easy process."
Individual experiences and results vary. Testimonials reflect the views of individual clients.
Before you arrive
How to prepare for your visit.
Following these guidelines helps keep your results accurate. Deviating can affect the data.
~8 minutes
- Fast for at least 2 hours before your test
- No exercise before — limit activity
- Do not come in dehydrated
- Wear workout clothes without metal (no belts, watches, jewelry)
- Wear socks — you'll be lying on the table
- No contrast medium within 48 hours
~20 minutes
- Fast for at least 3 hours (water only)
- No exercise before — limit activity
- Get adequate sleep the night before
- No caffeine or stimulants on the day of your test
- Wear workout clothes and athletic shoes
- Test is done on a treadmill or bike
~15 minutes
- Fast for at least 5 hours (water only)
- No exercise before — limit activity
- Get adequate sleep — ideally test in the morning
- No caffeine or stimulants; no alcohol within 12 hours
- Comfortable clothing — you'll be sitting in a chair
- You'll breathe into a mask for 15 minutes at rest
Quick answers
Common questions.
DexaFit combines detailed body composition testing with data-powered reporting built on over a decade of real-world measurements across 4 continents. Most providers give you a number. We give you a number, what it means, and the context to track it over time.
A DEXA scan uses a very low dose of X-ray radiation — far less than a chest X-ray and roughly equivalent to a few hours of natural background radiation. The technology has been used in research and clinical settings for decades and is considered low-risk for most adults. If you are pregnant or think you may be, or have specific concerns, please check with your physician before testing.
The DEXA Body Composition Scan itself takes about 8 minutes. VO2 Max is approximately 20 minutes. RMR is 15 minutes of quiet breathing. Most clients doing all three are in and out in under 60 minutes, including check-in and review.
The DEXA Body Composition Scan is a popular choice for GLP-1 users. It shows the breakdown of fat mass versus lean mass — something the scale alone can't tell you. Studies suggest a meaningful portion of weight lost on GLP-1 therapy can be lean mass, so a DEXA helps you see your own breakdown. Combining with RMR adds your measured metabolic baseline.
Absolutely — and we encourage it. DexaFit reports use widely recognized body composition technology and terminology. Many clients share their reports with their primary care doctor, dietitian, or trainer to inform their own decisions.
Most clients test every 3–6 months to track progress. The real value is in the repeat measurement — seeing how your body changes over time as you adjust your training and nutrition. A single test gives you a baseline; re-testing shows your trend.
VO2 Max reflects cardiorespiratory fitness — how efficiently your body uses oxygen during exertion. It's one of the most studied markers of fitness and longevity (Mandsager et al., JAMA 2018). RMR measures how many calories your body burns at rest. They reflect different systems and are both useful in the same visit.
Yes. Blood panels can be added to your visit or booked separately and are processed through a third-party laboratory. To view blood panel options click here, or contact us at boston@dexafit.com.
Find us
DexaFit Boston
Get DexaFit Boston
Your body is telling
a story right now.
8 minutes. Detailed results. The baseline everything else builds on.
* Mandsager et al., JAMA 2018 — 122,007 patients. All-cause mortality, least-fit vs. most-fit quintile. Statistics shown are for general educational context; individual results vary.