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What to Expect From a Dexa Scan?

A dexa scan, or a dual energy X-ray absorptiometry scan, is a type of X-ray scan used to measure bone density. It is a noninvasive procedure with very low risks.

  1. What the Procedure Does

    • In a dexa scan, two beams of X-rays at different strengths are directed at the patient's bones. By measuring how much of the X-rays are absorbed by the bones, a doctor can determine the bone density.

    How to Prepare

    • Before the exam, you can eat normally, but avoid taking any calcium supplements. You should avoid wearing any clothing that includes any metal buttons or zippers. You might be asked to remove your clothing and wear a hospital gown during the procedure.

    The Procedure

    • You will be asked to lie on a padded table that contains the device. A detector will be slowly passed over the area. You will be asked to hold very still and avoid breathing for the few seconds the picture is taken. The procedure will take 10 to 30 minutes.

    Results

    • After the test, you will be given a T score and a Z score. The T score compares your bone density with young adults of your gender, while the Z score compares you with people of your age group. A T score of minus 1 to minus 2.5 is low, and below minus 2.5 is osteoporosis.

    Repeating the Procedure

    • If you are considered to be at risk, repeated procedures might be required every two years or so.

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