Why is it necessary? of DEXA scan

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By assessing the bone mineral density of the patient, a DEXA scan can work out whether the readings are significantly lower than normal for their age and sex, and if they are therefore more likely to break a bone. This technique is used to detect osteoporosis in its early stages, as it is very sensitive to slight changes in density.

Conditions other than osteoporosis can also cause low bone density levels and may also cause fractures. These include osteopenia (a milder form of bone loss), brittle bone disease, secondary prostate cancer, Paget's disease and osteomalacia (vitamin D deficiency).

All patients on corticosteroids should have their bone strength measured with a DEXA scan because these medicines can weaken the bones.

DEXA can also be used to detect body composition, including the precise amount of body fat, muscle and body water. This is useful for monitoring general health and weight loss.

DEXA scans are only of limited use in people with a spinal deformity or who have had previous spinal surgery. The presence of vertebral compression fractures or osteoarthritis may interfere with the accuracy of the results.