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Friday 25 September 2026 05:04:43 GMT
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Danang Kurniawan :
2026-09-25 08:10:34
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A DEXA scan (dual-energy X‑ray absorptiometry) is a medical imaging test that measures bone mineral density and whole‑body composition using two low‑dose X‑ray beams. Key points: - Purpose: gold standard for diagnosing osteoporosis/osteopenia (bone density) and widely used to measure body composition—total fat mass, lean mass, and regional distribution (arms, legs, trunk).   - How it works: two X‑ray energies pass through the body; differential absorption by bone, fat, and lean tissue lets the machine calculate densities and masses.   - What it shows: precise bone mineral density (T‑score/Z‑score), total and regional fat mass, and lean (non‑fat) mass. Useful for tracking muscle loss/gain and fat changes over time.   - Accuracy & limits: very accurate for bone; body composition is reliable but affected by hydration, recent exercise, and device/model differences. DEXA reports lean mass (includes muscle + organs/fluids) but cannot directly distinguish muscle quality or intramuscular fat. Visceral vs subcutaneous fat estimates vary by machine.   - Procedure: quick (10–20 minutes), lying still on a table while the scanner passes over you. Noninvasive; you remove metal and stay still.   - Safety: low radiation exposure — far less than a chest CT; considered safe for most people.   - Prep & frequency: usually no special prep beyond avoiding heavy exercise and large meals right before; frequency depends on clinical need (e.g., yearly for monitoring in some cases, longer intervals for routine checks).   - Uses in your fasting experiment: excellent objective measure to detect changes in total and regional lean mass over time (paired with strength testing and bloodwork for fuller context). #dexascan #bodyfat
A DEXA scan (dual-energy X‑ray absorptiometry) is a medical imaging test that measures bone mineral density and whole‑body composition using two low‑dose X‑ray beams. Key points: - Purpose: gold standard for diagnosing osteoporosis/osteopenia (bone density) and widely used to measure body composition—total fat mass, lean mass, and regional distribution (arms, legs, trunk). - How it works: two X‑ray energies pass through the body; differential absorption by bone, fat, and lean tissue lets the machine calculate densities and masses. - What it shows: precise bone mineral density (T‑score/Z‑score), total and regional fat mass, and lean (non‑fat) mass. Useful for tracking muscle loss/gain and fat changes over time. - Accuracy & limits: very accurate for bone; body composition is reliable but affected by hydration, recent exercise, and device/model differences. DEXA reports lean mass (includes muscle + organs/fluids) but cannot directly distinguish muscle quality or intramuscular fat. Visceral vs subcutaneous fat estimates vary by machine. - Procedure: quick (10–20 minutes), lying still on a table while the scanner passes over you. Noninvasive; you remove metal and stay still. - Safety: low radiation exposure — far less than a chest CT; considered safe for most people. - Prep & frequency: usually no special prep beyond avoiding heavy exercise and large meals right before; frequency depends on clinical need (e.g., yearly for monitoring in some cases, longer intervals for routine checks). - Uses in your fasting experiment: excellent objective measure to detect changes in total and regional lean mass over time (paired with strength testing and bloodwork for fuller context). #dexascan #bodyfat

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