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# How to Read a DEXA Scan Report: A Practical Guide
- URL: https://blog.groovehealth.com/how-to-read-a-dexa-scan-report/
- Published: 2026-09-24T02:11:49.000Z
- Updated: 2026-09-24T03:02:07.000Z
- Description: Your DEXA report packs bone density, T-scores, Z-scores, and sometimes body fat and muscle data onto a few pages. Here is how to read each section, which number sets your diagnosis, and what to ask your doctor.
- Author: Groove Editorial Team
- Tags: DXA Scan, Bone Density, Osteoporosis

## Step-by-Step Breakdown: How to Read a DEXA Scan Report

A dual-energy X-ray absorptiometry (DEXA) scan report is usually organized into a few key sections: patient and scan quality details, scan images with region-of-interest maps, numerical results tables, and reference range graphs. The results table shows each body area measured, such as the lumbar spine L1-L4, total hip, femoral neck, and sometimes the forearm. For each site, it typically reports bone mineral density in grams per square centimeter (g/cm²), a T-score, a Z-score, and often a percentage comparison with young adult and age-matched reference groups. The single lowest T-score among the lumbar spine, total hip, and femoral neck establishes your clinical diagnosis. When [interpreting DEXA scan results](https://blog.groovehealth.com/interpreting-dexa-scan-results/), reviewing these sections in order helps you separate true bone measurements from positioning issues or visual artifacts.

### Patient Information and Scan Quality Data

The top section of the report lists your name, date of birth, biological sex, measured height, and weight. Verifying these details is essential because reference databases compare your results against standard populations based on age and sex. A change in recorded height may also alert your clinician to evaluate for silent vertebral compression fractures.

This section also records the scanner manufacturer, software version, and calibration status. Machine calibration ensures the low-dose X-ray beams measure tissue attenuation accurately.

### Scan Images and Region of Interest Maps

The visual images show the specific bone regions evaluated by the software. For the lower back, the image displays the lumbar vertebrae labeled L1 through L4\. For the hip, boxes outline the femoral neck, trochanter, and total hip area.

![Flowchart of the five sections of a DEXA scan report: patient and scan quality data, scan images, results table, reference charts, and radiologist impression](https://storage.googleapis.com/ai-templates.appspot.com/temp_images/99ffe2d8bc794fdd8d96545b682c10d4.png "DEXA scan analysis process")

Radiologists review these images to confirm that you were positioned straight and that no movement occurred during the scan. They also check for artifacts such as calcified blood vessels, surgical hardware, or severe spinal osteoarthritis. Arthritic bone spurs add extra calcium that can artificially raise bone mineral density (BMD) numbers, making bones look denser than they truly are.

### The Numerical Results Table and Scanned Sites

The results table contains the core data of your scan. Bone mineral density is reported in grams per square centimeter (g/cm²), which measures the mineral content packed into the scanned bone area.

| Scanned Region       | Measured Metric               | Key Purpose                                                       |
| -------------------- | ----------------------------- | ----------------------------------------------------------------- |
| Lumbar Spine (L1–L4) | BMD (g/cm²), T-score, Z-score | Measures central trabecular (spongy) bone strength                |
| Femoral Neck         | BMD (g/cm²), T-score, Z-score | Key site for predicting hip fracture risk                         |
| Total Hip            | BMD (g/cm²), T-score, Z-score | Combines neck, trochanter, and shaft measurements                 |
| Forearm (33% Radius) | BMD (g/cm²), T-score, Z-score | Used if hip or spine cannot be scanned or for hyperparathyroidism |

Clinicians follow the lowest score rule established by the International Society for Clinical Densitometry (ISCD). The single lowest T-score among the lumbar spine, femoral neck, and total hip establishes your diagnostic category.

### The Reference Range Graph and Color Bands

Most reports feature a visual graph plotting your bone density against age trajectories. The vertical axis displays your T-score or BMD, while the horizontal axis tracks age.

Colored horizontal bands provide a quick visual reference: green indicates normal bone density, yellow marks low bone density (osteopenia), and red signifies osteoporosis. A plotted point reveals where your bones rank compared to average age-related bone loss trajectories.

### The Radiologist Impression

The final section contains the radiologist's impression and summary narrative. Here, the interpreting physician synthesizes the numerical findings, notes any anatomical anomalies or excluded vertebrae, compares results against historical scans, and provides diagnostic context for your primary care doctor.

## Understanding Bone Density Scores and What They Mean

Bone density scores show how your bone mass compares to standardized reference populations. Rather than calculating complex formulas yourself, you can review our detailed guide on [what T-scores and Z-scores mean](https://blog.groovehealth.com/what-does-t-score-and-z-score-mean-in-dexa-scans/) to understand the underlying statistical definitions.

| Diagnostic Category        | T-Score Range         | Clinical Meaning                                              |
| -------------------------- | --------------------- | ------------------------------------------------------------- |
| Normal Bone Density        | \-1.0 or higher       | Bone density is within standard young adult ranges            |
| Osteopenia (Low Bone Mass) | Between -1.0 and -2.5 | Bone density is lower than normal; moderate fracture risk     |
| Osteoporosis               | \-2.5 or lower        | Bone density is significantly reduced; elevated fracture risk |

### T-Scores: Peak Bone Mass and Diagnosis

A T-score compares your bone mineral density to a healthy young adult reference baseline. To see where your results fit into clinical categories, explore established [osteopenia T-score ranges](https://blog.groovehealth.com/t-score-osteopenia-range-chart/) and what it means to have a [T-score below -2.5](https://blog.groovehealth.com/t-score-below-25-meaning/). For every drop of one standard deviation, fracture risk roughly doubles.

### Z-Scores: Age-Matched Evaluation

A Z-score compares your bone mineral density to an average person of your same age, sex, and ethnic background. According to [clinical guidelines from the Bone Health and Osteoporosis Foundation (BHOF)](https://pmc.ncbi.nlm.nih.gov/articles/PMC9546973/?ref=blog.groovehealth.com), a Z-score of -2.0 or lower is below the expected range for age. Such a score prompts physicians to investigate [secondary causes of bone loss](https://blog.groovehealth.com/secondary-osteoporosis-causes/), such as vitamin D deficiency, thyroid disorders, or medication side effects.

### Trabecular Bone Score and Fracture Risk

Some modern DEXA systems include a Trabecular Bone Score (TBS) software analysis to evaluate the internal microarchitecture of spinal bone. Clinicians often combine femoral neck scores and TBS inside the Fracture Risk Assessment Tool (FRAX) to calculate 10-year fracture probability. Learning more about [fracture risk assessment](https://blog.groovehealth.com/dexa-t-score-fracture-risk/) helps place these numerical probabilities in perspective.

## Body Composition Metrics: Fat Mass, Lean Mass, and VAT

Full-body DEXA scans measure total body composition alongside bone density by dividing tissue into fat mass, lean muscle mass, and bone mineral content. This analysis provides an accurate evaluation of metabolic health and physical function.

### Reading the Body Composition Summary

Full-body reports list total weight split into fat percentage, total lean mass, and regional distributions across the arms, legs, and torso. The Fat Mass Index (FMI) divides fat mass by height squared, so body fat can be compared across people of different heights.

Regional breakdowns reveal muscle symmetry between your left and right limbs. Significant asymmetries in arm or leg lean mass often point to past injuries, joint compensation, or nerve impingement.

### Visceral Adipose Tissue and Android-to-Gynoid Ratio

The report separates subcutaneous fat (stored directly beneath the skin) from visceral adipose tissue (VAT), which surrounds vital internal organs inside the abdominal cavity.

- **Android Region:** Fat stored around the abdomen and waistline.
- **Gynoid Region:** Fat stored around the hips, buttocks, and upper thighs.
- **Android-to-Gynoid (A/G) Ratio:** A key cardiometabolic indicator. An A/G ratio below 0.8 for women and below 1.0 for men reflects optimal fat distribution.
- **VAT Area Thresholds:** A VAT area under 100 square centimeters (cm²) is associated with low cardiometabolic risk, 100 to 159 cm² with increased risk, and 160 cm² or more with high risk for insulin resistance and cardiovascular disease.

### Appendicular Lean Mass and Sarcopenia Screening

Appendicular lean mass represents the combined muscle tissue of your arms and legs. Dividing this number by your height in meters squared yields the Relative Skeletal Muscle Index (RSMI), also known as the Appendicular Lean Mass Index (ALMI).

Clinicians use RSMI to screen for sarcopenia, the age-related loss of skeletal muscle mass and strength. One widely used set of sarcopenia thresholds is less than 7.26 kg/m² for men and less than 5.45 kg/m² for women. Preserving this skeletal muscle through targeted resistance training protects joint mobility and reduces fall frequency in older adults.

## Tracking Changes Over Time and What to Discuss With Your Doctor

Tracking changes over time requires comparing bone mineral density in grams per square centimeter rather than relying on T-scores alone. Small shifts in reference software can alter T-scores without reflecting actual biological bone changes.

![Infographic on tracking DEXA results over time: compare BMD in g/cm2, check the least significant change, use the same scanner, and review trends with your doctor](https://storage.googleapis.com/ai-templates.appspot.com/temp_images/2b3ed590eda54698bf49e3e1e10d1d57.png "Bone health tracking and physician collaboration")

### Identifying Statistically Significant Changes on Repeat Scans

Every imaging machine has an inherent margin of error. Clinical centers calculate a metric called the Least Significant Change (LSC) to determine whether a measured change is true biological progress or standard equipment variability.

A change in BMD must exceed the facility's LSC (typically 3% to 5% at the spine and hip) to be considered clinically meaningful. To ensure valid comparisons, maintain a consistent [recommended DEXA scan frequency](https://blog.groovehealth.com/dexa-scan-frequency/) and schedule follow-up scans on the same make and model of scanner whenever possible.

### What to Ignore and Preparing for Your Medical Appointment

When reviewing your paper report, you can safely ignore minor variations in individual lumbar vertebrae (such as comparing L1 to L2 in isolation) and focus instead on the total L1–L4 composite score unless a vertebra was specifically excluded. You can also ignore forearm measurements unless your physician specifically requested a forearm scan, which is generally used only when hip or spine scans are not viable or to evaluate hyperparathyroidism.

Bring your full imaging report to your next clinical visit, along with a list of all current medications, daily calcium intake, and any recent history of falls.

Consider asking your physician the following questions during your review:

- Does my lowest T-score fall into the osteopenia or osteoporosis range?
- Did spinal osteoarthritis artificially elevate my lower back bone density reading?
- Does my 10-year FRAX score suggest I should consider bone-specific medical therapy?
- Are my Z-scores low enough to warrant blood tests for secondary causes of bone loss?
- What progressive resistance training guidelines are appropriate for my bone strength?

Groove Health is a Medicare covered bone health program for adults 65 and older that pairs each member with a physician and a physical therapist who designs a personalized exercise plan.

For older adults, building and maintaining bone requires osteogenic loading through heavy resistance training using low repetitions and challenging loads appropriate for individual capacity. Compound functional movements that load the hip and spine (such as squats, lunges, and hip hinges) should prioritize spinal extension while avoiding loaded spinal flexion.

To reduce fall risk, incorporate progressive balance exercises starting on stable, braced supports (such as a sturdy counter or a chair braced against a wall) before advancing to dynamic movements under professional supervision. Light activities like walking, gentle stretching, or light resistance bands support mobility and joint function, but they do not provide the mechanical load necessary to stimulate new bone formation.

## Frequently Asked Questions About DEXA Scan Reports

### How often should older adults get a follow-up DEXA scan?

Follow-up bone mineral density scans are typically recommended every 1 to 2 years for individuals undergoing active medical treatment for osteoporosis or those with significant risk factors. For individuals with stable, normal bone density, intervals of 3 to 5 years or longer may be appropriate based on physician recommendations.

### Does Medicare cover routine DEXA bone density scans?

According to [Medicare.gov](https://www.medicare.gov/coverage/bone-mass-measurements?ref=blog.groovehealth.com) and CMS, Medicare Part B covers a DEXA bone density measurement once every 24 months (or more often if medically necessary) for qualifying beneficiaries, including women with estrogen deficiency at clinical risk for osteoporosis, individuals with vertebral abnormalities, those receiving long-term steroid therapy, and individuals being monitored for osteoporosis drug response. Coverage rules and out-of-pocket costs may vary by specific plan type. You can review detailed [Medicare coverage guidelines](https://blog.groovehealth.com/dexa-medicare-guidelines-2026/) to verify your eligibility criteria.

### What is the difference between total hip and femoral neck scores?

The femoral neck is the narrow strut of bone connecting the ball of the hip joint to the femur shaft. It contains a high proportion of trabecular bone and serves as the primary predictor for hip fracture risk. The total hip score averages the femoral neck, trochanter, and upper femoral shaft, which contains more dense cortical bone and provides a reliable baseline for monitoring long-term treatment response.

## Using Your Report to Protect Your Bones

Understanding your DEXA scan report empowers you to take an active role in managing your bone health. By focusing on your lowest T-score, identifying meaningful trends across repeat scans, and discussing comprehensive fracture risk with your doctor, you can take practical steps to protect your bones. Applying these scan insights to personalized, home-based exercise plans designed by a physical therapist and physician provides a structured approach to building bone strength, enhancing balance, and preventing fractures.

For comprehensive resources on bone health, explore [interpreting DEXA scan results](https://blog.groovehealth.com/interpreting-dexa-scan-results/) to continue building your knowledge.

## Works Cited

1. International Society for Clinical Densitometry. "[Official Adult Positions](https://iscd.org/official-positions-2023/?ref=blog.groovehealth.com)." *International Society for Clinical Densitometry*, 2023.
2. LeBoff MS, Greenspan SL, Insogna KL, et al.. "[The clinician's guide to prevention and treatment of osteoporosis](https://pmc.ncbi.nlm.nih.gov/articles/PMC9546973/?ref=blog.groovehealth.com)." *Osteoporosis International*, 2022.
3. Minetto MA, Busso C, Lalli P, et al.. "[DXA-Derived Adiposity and Lean Indices for Management of Cardiometabolic and Musculoskeletal Frailty: Data Interpretation Tricks and Reporting Tips](https://pmc.ncbi.nlm.nih.gov/articles/PMC9397817/?ref=blog.groovehealth.com)." *Frontiers in Rehabilitation Sciences*, 2021.
4. Baumgartner RN, Koehler KM, Gallagher D, et al.. "[Epidemiology of sarcopenia among the elderly in New Mexico](https://pubmed.ncbi.nlm.nih.gov/9554417/?ref=blog.groovehealth.com)." *American Journal of Epidemiology*, 1998.

This content is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare professional for diagnosis and treatment. If you are on Medicare and interested in a personalized bone health program, you can check your eligibility at [groovehealth.com](https://my.groovehealth.com/signup/osteo/start?ref=blog.groovehealth.com).