DEXA Scans: An Explanation
Ever had a DEXA scan but not sure what it really is?
Simply want to learn more? This is our simplified guide to a DEXA scan.
A bone density scan, often known as a DEXA scan, is a test used to measure bone density. Low bone density means you may be at a higher risk of developing a fracture or broken bones. DEXA scans are commonly used to help diagnose osteoporosis, (sometimes called brittle bone disease) and to assess fracture risks
DEXA stands for dual‑energy X‑ray absorptiometry. Compared to traditional X‑rays, DEXA scans use a very low dose of radiation, making them a preferred option for bone density assessment.
Unlike an MRI, DEXA scans don’t involve the patient being enclosed in any way. Instead, a long arm-like detector will move up and down your body, and then produce images on a nearby monitor, allowing a clinician to assess bone density accurately.
DEXA stands for dual‑energy X‑ray absorptiometry. Compared to traditional X‑rays, DEXA scans use a very low dose of radiation, making them a preferred option for bone density assessment.
Unlike an MRI, DEXA scans don’t involve the patient being enclosed in any way. Instead, a long arm-like detector will move up and down your body, and then produce images on a nearby monitor, allowing a clinician to assess bone density accurately.
There are two main types of DEXA scanning device used in clinical practice.
Central DEXA devices
The most common type. These are large machines that can measure bone density in the centre of your skeleton, such as hip and spine.
Peripheral DEXA devices
Smaller, portable machines that are used to measure bone density in the periphery of your skeleton, such as your wrist, heel or finger. (Patient.Info, 2023)
4ways offer comprehensive DEXA scan reporting services, supporting clinicians with accurate, timely, and reliable results, all from the UK.
Go to Specialist Radiology Services – 4ways to find out more.
References
Patient.Info, 2023. DEXA Scan. [Online]
Available at: https://patient.info/bones-joints-muscles/osteoporosis-leaflet/dexa-scan
[Accessed 5th May 2026].