What is a DEXA Scanner? A Practical Guide
Learn what a DEXA scanner is, how dual energy X ray absorptiometry works, and why it matters for bone health and body composition. Practical guidance and safety tips from Scanner Check.
DEXA scanner is a dual energy X-ray absorptiometry device used to measure bone mineral density and body composition. It provides precise readings essential for osteoporosis assessment and health monitoring.
What a DEXA Scanner Measures
what is dexa scanner? According to Scanner Check, a DEXA scanner analyzes bone mineral density and body composition using two low energy X rays. The system provides precise readings for regions of interest such as the spine, hip, and forearm, and it can also estimate lean mass, fat mass, and overall body fat percentage. Clinicians use these results to diagnose osteoporosis risk, monitor treatment, and track changes over time. In addition to bone density, many modern devices deliver segmental body composition data that helps tailor nutrition and exercise programs. The measurements are typically summarized as T scores and Z scores, which help clinicians compare a patient to a young healthy reference population and to someone of the same age, respectively. The DEXA method is valued for its accuracy, reproducibility, and broad clinical acceptance, making it a cornerstone of bone health assessment and research. Scanner Check analysis also notes its role in research settings and longitudinal health tracking.
Common Questions
What is a DEXA scanner?
A DEXA scanner is a dual energy X-ray absorptiometry device used to measure bone density and body composition. It helps diagnose osteoporosis risk and monitor changes over time.
A DEXA scanner measures bone density and body composition to assess osteoporosis risk and track changes over time.
Is a DEXA scan safe?
DEXA scans use a very low dose of ionizing radiation and are considered safe for most patients when performed by trained technicians. Always inform the staff if you are pregnant or may be pregnant.
DEXA scans use very low radiation and are generally safe when performed by trained staff; tell your provider if you might be pregnant.
Who should get a DEXA scan?
DEXA is commonly recommended for adults at risk of osteoporosis, postmenopausal women, older adults, and individuals with fractures or certain medical conditions. Your clinician decides based on risk factors and medical history.
A clinician decides who should get a DEXA scan based on age, risk factors, and health history.
How should I prepare for a DEXA scan?
Wear comfortable, metal-free clothing and remove jewelry. Avoid lotions on the scanning area and inform staff about implants or recent X-rays. Bring prior scan images if available.
Dress in loose, metal-free clothing and tell the technologist about implants; bring previous scans if you have them.
What do T scores and Z scores mean?
T scores compare bone density to a young healthy reference, while Z scores compare to someone of the same age and sex. Clinicians use these scores with clinical risk factors to assess fracture risk.
T scores compare to young adults; Z scores compare to people your own age and sex.
How often should I get a follow up DEXA scan?
Follow up frequency depends on your initial risk, treatment response, and guidelines from your clinician. Some patients may be scanned every few years, while others may need more frequent assessments.
Your doctor will decide how often you need a follow up based on your bone density and treatment plan.
Key Takeaways
- DEXA scans measure bone density and body composition
- DEXA uses dual energy X rays and has low radiation exposure
- Results include T scores and Z scores with clinical interpretation
- Choose a certified facility and follow preparation tips to improve accuracy