Book your test.
Know your body.
Clinical-grade DEXA Body Composition Scan, VO2 Max Test, and RMR Test — available in one visit. The data that changes how you train, eat, and live.
Take our 60-second quiz and we'll recommend the right test — or bundle — for your goals.
Take the quiz →vs. 8–15% error on smart scales
lean muscle — not fat
lowest VO2 Max group vs. elite*
why most nutrition plans plateau
Choose your test
Book individual tests
or combine them.
Each test delivers a specific, clinical-grade insight. Most clients combine 2–3 tests in a single visit for a complete biological picture.
DEXA Body Composition Scan
The clinical reference standard. Measures fat mass, lean mass, and bone density — by region, with ±2% clinical accuracy. See exactly what your body is made of, not just how much it weighs.
~8 min Get DexaFit BostonVO2 Max Test
The single strongest predictor of long-term health and longevity. Walk or run on a treadmill wearing a mask while we measure your cardiovascular ceiling — and tell you exactly how to raise it.
~20 min Get DexaFit BostonResting Metabolic Rate (RMR) Test
Formula-based calculators miss your actual metabolism by up to ±20%. Breathe into a mask for 15 minutes and get your precise caloric baseline — so your nutrition finally matches your biology.
~15 min Get DexaFit BostonBlood Lab Tests
Your DEXA sees the structure. Blood labs reveal what's driving it. Hormones, inflammation, glucose regulation, lipid profile, and key micronutrients — all in one visit.
Quick draw Get DexaFit BostonFull Biological Baseline
DEXA Body Composition Scan + VO2 Max Test + RMR Test in a single appointment. The most complete picture of your body available outside a hospital. Recommended for anyone starting a serious health or longevity protocol.
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 delivers every number in context — with clear direction on what to do next.
What our clients say
5.0 ★ — over 1,000 verified reviews.
"I've been tracking my weight for years and getting nowhere. The DEXA showed I had lost muscle, not fat. That single insight completely changed my training and diet. Within 3 months I had actual, measurable results."
"My VO2 Max result was alarming — but in a way that motivated me. I finally had a real number to improve. Six months later my score had gone up significantly. That kind of progress feels real."
"I'm on Ozempic and wanted to know whether I was losing fat or muscle. The DEXA gave me exactly that answer. My doctor was impressed I had actual tissue-level data. This is now part of my protocol every 3 months."
Before you arrive
How to prepare for your visit.
Following these guidelines ensures your results are accurate. Deviating affects 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 clinical-grade 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, what's driving it, and clear direction on what to do about it.
Yes. A DEXA scan delivers extremely low-level X-ray radiation — far less than a chest X-ray and roughly equivalent to a few hours of ambient radiation. The technology has been used in hospitals and research institutions for decades and is safe for the vast majority of adults.
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 a full panel (all three) are in and out in under 60 minutes, including check-in and review.
The DEXA Body Composition Scan is the most important test for GLP-1 users. It reveals whether the weight you're losing is fat, muscle, or both — something the scale cannot tell you. Roughly 1 in 3 pounds lost on GLP-1 therapy is lean mass. The DEXA tells you whether you're in that group. Combining with RMR gives you a complete metabolic picture.
Absolutely — and we encourage it. DexaFit reports use the same technology and terminology recognized by physicians worldwide. Many clients share their reports with primary care doctors, endocrinologists, sports medicine physicians, and dietitians. The data speaks the language of clinical practice.
Most clients test every 3–6 months to track progress. The real value of DexaFit is in the repeat measurement — seeing how your body changes over time as you adjust your training, nutrition, or protocol. A single test gives you a baseline. The DexaFit Feedback Loop gives you accountability.
VO2 Max measures cardiovascular capacity — how efficiently your body uses oxygen during exertion. It's the strongest predictor of long-term survival in clinical research (Mandsager et al., JAMA 2018). RMR measures how many calories your body burns at rest. They test different systems and are both useful in the same visit.
Yes. Blood panels can be added to your visit or booked separately. To view blood panel options and available times, use the "Blood panels" link in the booking widget above, or contact us at boston@dexafit.com.
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DexaFit Boston
Get DexaFit Boston
Your body is telling
a story right now.
8 minutes. Clinical-grade results. The baseline everything else builds on.
* Mandsager et al., JAMA 2018 — 122,007 patients. Least-fit vs. elite quintile.