Here's How a DEXA Scan Works

A DEXA scan, short for Dual-Energy X-Ray Absorptiometry, is a cutting-edge tool for analyzing body composition and bone density. It’s often regarded as the gold standard for precision and accuracy in assessing fat, muscle, and bone. But how does this technology work, and what makes it so reliable? Let’s break it down.

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The Science Behind a DEXA Scan

DEXA technology uses two low-dose X-ray beams at different energy levels to measure your body’s composition. These beams pass through your body, and the scanner detects how much of each beam is absorbed by different tissues—fat, lean muscle, and bone.

Because each type of tissue absorbs X-rays differently:

• Fat absorbs less energy.
• Lean muscle absorbs slightly more.
• Bone absorbs the most.

The scanner captures this data and processes it to produce a highly detailed image and report of your body composition.

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What Happens During a DEXA Scan?

Preparation

• You’ll lie down fully clothed on a padded table, ensuring you’re not wearing anything with metal (like zippers or underwire bras).
• The technician may adjust your position to ensure accurate readings.

To learn more, read this post about how to prepare for a DEXA scan.

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The Scan

• The machine’s arm passes slowly over your body, emitting the dual-energy X-rays.
• The scan takes around 6 minutes and is completely painless.
• There’s no need for you to move or hold your breath during the process.

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Data Analysis

The scanner sends the collected data to a computer, which analyzes the differences in energy absorption to calculate your body composition. The result is a detailed report that includes:

• Body fat percentage
• Lean muscle mass
• Bone mineral density
• Regional composition (e.g., fat and muscle distribution in specific areas)

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Why Is a DEXA Scan So Accurate?

Unlike other methods like bioelectrical impedance or calipers, a DEXA scan directly measures tissue densities. This reduces the margin of error caused by factors like hydration levels or operator error, making it the most reliable option for body composition analysis.

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Is a DEXA Scan Safe?

Yes, DEXA scans are very safe. The amount of radiation used is minimal—less than what you’d be exposed to during a cross-country flight. This makes it suitable for repeated use to track progress over time.

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What Are the Results Used For?

The insights from a DEXA scan can help you:

• Set fitness goals based on precise fat and muscle metrics.
• Track progress in weight loss or muscle-building programs.
• Assess bone health to prevent or manage conditions like osteoporosis.
• Optimize performance for athletes and fitness enthusiasts.

A DEXA scan offers a deeper understanding of your body’s makeup, empowering you to make informed decisions about your health and fitness journey.

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Book Your DEXA Scan in San Francisco at KALOS Today

If you’re ready to take control of your health with the most accurate body composition analysis available, it’s time to book your DEXA scan at KALOS. Whether you’re looking to get lean, build muscle, improve performance, or optimize longevity, our advanced technology and expert guidance will help you get there. Schedule your scan today at KALOS—your journey to data-driven fitness starts now.