How to Read DEXA Scan Results
Your report has two halves — body composition and bone density. Here is what each number means, the reference ranges to look for, and how to read your trend.
To read a DEXA scan, split the report in two. The body-composition page shows body-fat percentage, lean (muscle) mass per limb and trunk, a visceral-fat (VAT) estimate, and an android/gynoid ratio. The bone-density page shows your T-score (vs a healthy 30-year-old) and Z-score (vs your own age and sex). Read the composition numbers for fat and muscle, the T- or Z-score for bone, and your trend across scans on the same machine. This is information, not a diagnosis — review it with a clinician.
Last updated: June 2026 • 11 min read
The Two Halves of a DEXA Report
A DEXA (dual-energy X-ray absorptiometry) report answers two different questions, and they are easy to mix up:
- Body composition — how much of you is fat, how much is lean (muscle and organs), and where the fat sits. This is the page most people get a scan for. It reports fat and lean mass for the whole body and for each region (arms, legs, trunk), plus a visceral-fat estimate and an android/gynoid ratio.
- Bone mineral density (BMD) — how dense your bones are, reported with a T-score and a Z-score. This is the original clinical use of DEXA and the one insurers most often cover for osteoporosis screening.
UCSF Radiology notes DXA is highly accurate compared with most other accessible body-composition methods and tells a clearer story than BMI — in one UCSF figure, 18.5% of women with a normal BMI had excess fat visible on DXA. Its biggest advantage over a scale or a handheld device is that regional detail: it can show that your right leg carries more lean mass than your left, or that your trunk fat is the part that moved.
Body-Fat Percentage: What the Number Means
Your report gives a total body-fat percentage and breaks it down by region. There is no single "ideal" number — it is a band that depends on sex, age, and goals. The widely cited ACE/ACSM general-population ranges below are fitness reference ranges, not diagnostic cutoffs:
| Category | Men | Women |
|---|---|---|
| Essential fat | 2-5% | 10-13% |
| Athletes | 6-13% | 14-20% |
| Fitness | 14-17% | 21-24% |
| Average | 18-24% | 25-31% |
| Obese | 25%+ | 32%+ |
Source: ACE Body Composition Percentage Chart, cross-checked against ACSM categories. Ranges are general guidance, not a medical assessment.
One trap worth naming: DEXA usually reads a few points higher than calipers, smart scales, or handheld BIA devices. That is expected — the methods measure differently. Do not compare a DEXA body-fat number to your bathroom scale's number, and do not panic if DEXA is higher. Compare DEXA to DEXA.
Lean Mass: The Number to Protect
Lean mass (sometimes shown as lean soft tissue or fat-free mass) is everything that is not fat or bone — primarily muscle, plus water and organs. DEXA reports it for your whole body and for each region: left arm, right arm, left leg, right leg, and trunk. No other accessible body-composition test gives that much regional detail.
Why it matters for reading your report: when you are losing weight — especially on a calorie deficit or a GLP-1 medication — the goal is usually to lose fat while preserving lean mass. A scan that shows weight down but lean mass also falling sharply is telling you something a bathroom scale cannot. Watching the fat-mass line and the lean-mass line move independently is the single most useful thing a DEXA tells most people. (For more on the GLP-1 and muscle question, see the DEXA complete guide below.)
Visceral Fat (VAT): The Health-Risk Number
Visceral adipose tissue (VAT) is the fat packed around your internal organs, as opposed to the subcutaneous fat just under the skin. It is the metabolically active fat most strongly linked to type 2 diabetes and cardiovascular disease, which is why your report flags it separately. UCSF notes DXA estimates VAT and that this measure can help predict diabetes and cardiovascular risk.
DEXA can report VAT as a mass, a volume, or an area. For the area measure, a peer-reviewed cardiometabolic-risk model in Frontiers in Rehabilitation Sciences groups VAT area like this:
- Under 100 cm² — generally lower risk
- 100-159 cm² — increased cardiometabolic risk
- 160 cm² or more — high risk
Read these as a flag, not a verdict. VAT is one input a clinician weighs alongside your blood pressure, fasting glucose, and lipid panel. A single number above a threshold does not diagnose anything — but a high or rising VAT is worth raising at your next appointment.
Android/Gynoid Ratio: Where the Fat Sits
The android/gynoid (A/G) ratio describes the pattern of fat storage. Android ("apple shape") is fat carried around the abdomen and midsection; gynoid ("pear shape") is fat carried around the hips and thighs. A higher A/G ratio means more abdominal storage, which tends to track with the visceral-fat risk picture above.
As a general reference, lower A/G ratios are considered more favorable from a metabolic-risk standpoint. Treat the ratio as context for the VAT number rather than a standalone score, and discuss what it means for you with a clinician.
Bone Density: T-Score vs Z-Score
The bone-density page reports your bone-mineral density at sites like the spine and hip, with two standardized scores. They answer different questions:
- T-score compares your bone to a healthy young adult (around age 30, at peak bone mass). Per WHO criteria, it is the score used to diagnose osteopenia and osteoporosis in postmenopausal women and men 50 and older.
- Z-score compares your bone to people of your own age and sex. Per the International Society for Clinical Densitometry (ISCD), it is the preferred score for premenopausal women, men under 50, and children — where applying T-score osteoporosis criteria would overestimate risk.
So the question "which score do I read?" is answered by your age and sex.
| Score | Meaning | Basis |
|---|---|---|
| T-score ≥ -1.0 | Normal bone density | WHO classification |
| T-score -1.0 to -2.5 | Osteopenia (low bone mass) | WHO classification |
| T-score ≤ -2.5 | Osteoporosis | WHO classification |
| Z-score > -2.0 | Within expected range for age | ISCD position |
| Z-score ≤ -2.0 | Below expected range for age | ISCD position |
T-score categories: WHO classification. Z-score cutoff: ISCD Official Positions. These are interpretation guides; a diagnosis is made by a clinician.
Note: A body-composition DEXA scan and a clinical bone-density (DXA) scan are not always the same appointment. Some body-comp studios report bone data; some do not. If bone health is your reason for scanning, confirm the report includes a T-score and Z-score before you book.
How to Read Your Trend Across Scans
A single DEXA is a snapshot. The real value is the slope between scans — but only if the scans are comparable. To make scan-to-scan comparisons meaningful:
- Same machine. Different DEXA devices and software calibrate differently; switching machines adds noise that can swamp a real change.
- Similar time of day and hydration. Lean mass includes water, so a dehydrated morning scan and a well-hydrated afternoon scan will not line up.
- Sensible spacing. Body composition does not move quickly. Every 3-6 months while actively changing, or annually for maintenance, is a common cadence; monthly is usually too frequent to show signal over noise.
- Read fat and lean separately. The headline you want is "fat down, lean held," not just "weight down."
Frequently Asked Questions
How do you read DEXA scan results?▼
A DEXA report has two halves. The body-composition page shows total and regional body-fat percentage, lean (muscle) mass per limb and trunk, a visceral-fat estimate, and an android/gynoid ratio. The bone page shows bone-mineral density with a T-score and a Z-score. Read the percentages and masses for your composition, then read the T-score (vs a healthy 30-year-old) or Z-score (vs your own age and sex) for bone. The single most useful habit is comparing the same machine over time, not chasing one absolute number. This is information, not a diagnosis — review your report with a clinician.
What is a good body fat percentage on a DEXA scan?▼
Using the widely cited ACE/ACSM ranges, the "fitness" band is roughly 14-17% for men and 21-24% for women, while the "athlete" band is about 6-13% for men and 14-20% for women. Essential fat is around 2-5% for men and 10-13% for women, and "obese" begins near 25%+ for men and 32%+ for women. DEXA tends to read a few points higher than calipers or BIA, so do not compare a DEXA number to a scale-fat number. There is no single ideal — use the band and your trend, and discuss targets with a clinician.
What is a dangerous visceral fat level on a DEXA scan?▼
DEXA reports visceral adipose tissue (VAT) as a mass, volume, or area. For the area measure, a peer-reviewed risk model groups 100-159 cm² as increased cardiometabolic risk and 160 cm² or more as high risk; under 100 cm² is generally considered lower risk. Visceral fat sits around the organs and is more strongly tied to diabetes and cardiovascular risk than subcutaneous fat. "Dangerous" is not a single line in the sand — VAT is one input among many. Have a clinician interpret your number alongside your blood pressure, glucose, and lipids.
What is the difference between a T-score and a Z-score on a DEXA scan?▼
A T-score compares your bone-mineral density to a healthy young adult (around age 30) and is the score used to diagnose osteopenia and osteoporosis in postmenopausal women and men 50 and older, per WHO criteria. A Z-score compares you to people of your own age and sex; per ISCD, it is the preferred score for premenopausal women, men under 50, and children. So the T-score answers "how does my bone compare to peak bone mass" and the Z-score answers "how does my bone compare to people like me." Your report usually shows both — which one matters depends on your age and sex.
What T-score means osteoporosis?▼
Under the WHO classification, a T-score of -1.0 or higher is normal, a T-score between -1.0 and -2.5 is osteopenia (low bone mass), and a T-score of -2.5 or lower is osteoporosis. These thresholds apply to postmenopausal women and men 50 and older. A T-score is not used to diagnose osteoporosis in younger adults or children — a Z-score is read instead, where -2.0 or lower is "below the expected range for age." A diagnosis and any treatment decision belong with your clinician, not a chart alone.
How accurate is a DEXA scan for body composition?▼
DEXA is considered highly accurate compared with most other accessible body-composition methods, and UCSF Radiology notes it tells a clearer story than BMI — in one UCSF figure, 18.5% of women with a normal BMI had excess fat visible on DXA. Its biggest edge is regional detail: it shows lean mass and fat per arm, per leg, and in the trunk, plus a visceral-fat estimate. For tracking, accuracy depends on consistency — same machine, similar time of day, and similar hydration scan to scan. Results are estimates, not a clinical verdict.
Ready to Get a DEXA Scan?
Compare verified body-composition DEXA providers by city — prices, locations, and add-on testing.
Find a DEXA Scan Near You →Related Guides
Sources
- • UCSF Radiology — Why DXA/DEXA beats BMI (accuracy, VAT, regional detail)
- • ISCD — 2023 Official Adult Positions (T-score vs Z-score use)
- • Medical News Today — Z-scores for bone density (WHO T-score chart)
- • Frontiers in Rehabilitation Sciences — DXA VAT cardiometabolic risk thresholds
- • ACE — Body Composition Percentage Chart (body-fat reference bands)
Medical disclaimer: This page is general information, not medical advice. Listings are aggregated from public sources and prices are estimates that may be out of date — confirm current pricing, services, and provider credentials directly with each clinic. Talk to a licensed clinician before starting any medication or treatment.
Affiliate disclosure: VitalityScout may earn a commission from some links, at no additional cost to you. This never affects which providers we list or how we describe them.
Tracking Your Body Composition?
Get our DEXA results cheat-sheet plus tips for reading your scan and tracking real progress over time.
No spam, unsubscribe anytime.