DEXA

DEXA (Dual Energy X-ray Absorptiometry) is a diagnostic technique used to measure bone density and assess the risk of osteoporosis and fractures. It is considered the gold standard for diagnosing osteoporosis.

Overview

DEXA uses a low dose of ionizing radiation to produce images of the inside of the body. It is most commonly used to measure bone density in the hip and spine, but can also be used to measure total body composition and fat content.

Procedure

During a DEXA scan, the patient lies on a flat table while a machine arm passes over their body. The machine sends low-dose X-rays with two different energy levels through the bones. By measuring the amount of X-rays that pass through the bone from each energy level, the machine can calculate the bone density.

Uses

DEXA is primarily used to diagnose osteoporosis, a condition that weakens bones and makes them more likely to break. It can also be used to assess an individual's risk for developing fractures. In addition, DEXA can measure total body composition and fat content, which can be useful in the diagnosis and treatment of conditions such as obesity.

Risks

While DEXA does involve exposure to ionizing radiation, the dose is very low — less than one-tenth the dose of a standard chest X-ray. As with any medical procedure, there are potential risks and benefits, and these should be discussed with a healthcare provider.

See Also

• Osteoporosis
• Bone density
• Fractures
• Obesity

DEXA Resources
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