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DEXA (Bone Density)

What is a DEXA Scan?

A DEXA (Dual-Energy X-ray Absorptiometry) scan measures bone mineral density (BMD) to assess the risk of fractures, osteoporosis, and other bone-related conditions. It’s the gold standard for diagnosing osteoporosis due to its accuracy.

How Does It Work?

    • Preparation:
      • Fasting: Depending on the type of scan, you may need to fast for 4-6 hours before the procedure.
      • Contrast Dye: You might be given a contrast to enhance image clarity. This can be administered orally, intravenously, or rectally. 
      • Medical Records: Bring any relevant medical documents or instructions from your doctor. 
        1. Blood test results for Creatinine and BUN will be required within 30 days prior to the exam for patients aged 60 and over, as well as patients with chronic kidney disease, diabetes, & hypertension.  Please ask your physician to order the blood tests and fax prior to the appointment or bring the results with you on the day of your appointment.
        2. Pregnancy test is required for patients that are of child bearing age.  
      • Inform Your Doctor: Let your doctor know if you have allergies to iodine contrast material, kidney problems, or are pregnant.

During the scan

        • Positioning: You’ll lie on a padded table while the DEXA scanner passes over your body. The scan typically focuses on the spine, hip, and sometimes the forearm.
        • Imaging: The scanner emits two low-dose X-ray beams at different energy levels. One beam is absorbed by soft tissue, and the other by bone. By measuring the absorption of each beam, the device calculates bone density.

Procedure

        • Remove Metal Items: You’ll need to remove any metal objects, such as jewelry, as they can interfere with the imaging.
        • Stay Still: It’s important to remain still during the scan to ensure clear images.
        • Duration: The scan itself usually takes about 10-20 minutes.

What to Expect?

  • Comfort: The procedure is non-invasive, quick, and painless.
  • Radiation: The level of radiation exposure is extremely low, much lower than a standard X-ray.
  • Results: The results are usually presented as a T-score and a Z-score. The T-score compares your bone density to a healthy young adult’s average, while the Z-score compares it to an average person of the same age, sex, and size.  Results will be faxed to your referring physician within 24-72 business hours.

After the Scan:

  • Normal Activities: You can usually resume normal activities immediately after the scan.
  • Follow-Up: Your doctor will discuss the results with you and recommend any necessary treatments or lifestyle changes.

Purpose of the Scan:

  • Diagnosing Osteoporosis: Helps in diagnosing osteoporosis and assessing fracture risk.
  • Monitoring Bone Health: Used to monitor bone health and the effectiveness of treatments for bone loss.
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