What should you know about body fat percentage DEXA scan?

DEXA uses low-dose X-rays to distinguish bone mineral from soft tissue. The report may describe total body fat, lean tissue, and how these are distributed across body regions. It is different from a bone-density scan ordered specifically to assess fracture risk, although the same type of equipment may be involved. A result can be influenced by hydration, recent food or exercise, positioning, and the machine's analysis method, so comparisons are most useful when conditions are similar.

Tell the imaging team if you might be pregnant, have recently had a contrast examination, or cannot remain still comfortably. Follow the centre's instructions about clothing, metal items, food, and fluids. Wear simple clothing and bring details of relevant medicines or previous scans. Ask whether the appointment is intended for body composition, bone health, or both. Do not change eating, exercise, or treatment solely because of a body-fat result; discuss the measurement alongside your health goals and medical history.

The scan itself is not an emergency test. Seek prompt clinical advice if the scan was arranged because of unexplained weight loss, weakness, repeated falls, suspected nutritional deficiency, or a major change in health. Tell the clinician about pregnancy possibility before imaging. A body-composition reading cannot explain symptoms such as severe breathlessness, chest pain, fainting, or sudden weakness; those symptoms need urgent assessment rather than waiting for a scan report.

Ask what the scan is designed to answer, which measurements will be reported, and how positioning or hydration may affect them. Clarify whether a bone-density assessment is included, how the result will change your care, and whether repeat measurements are useful. If your scan relates to hormonal or reproductive health, ask how that context affects interpretation, including conditions such as Premature Ovarian Insufficiency.