What is Bone Densitometry?

Bone densitometry or bone density scanning is used to measure bone loss by examining the density of bone. Several techniques can be used to accomplish this. These include DEXA (Dual Energy X-ray Absorptiometry) and QCT (Quantitative CT).

This guide will primarily deal with DEXA scanning, as much of the information re: CT scans is covered in the CT Patient Guide.

Brentwood Diagnostic Centre uses one of the most advanced DEXA scanners available. Our scan is painless, non-invasive and rapid. Sevenoaks, Weybridge and Leigh Diagnostic Centres do the assessment using their CT Scanners.

Measuring bone density is the gold standard for diagnosing and monitoring osteoporosis (loss of bone density). Bone density scans can also give your doctor information about the likelihood of fractures at a later date; the lower the bone density, the higher the chance of fractures.

One of the advantages of our modern, dedicated scanner is that the x-ray dose you will be exposed to is extremely low. However, because of the risks of radiation exposure to the foetus, pregnant women are advised to avoid this procedure.

On the day of the scan, you may eat normally. You should not take calcium supplements for at least 24 hours before your exam. You should contact the centre before your scan, if you have had an exam involving contrast media in the last 2 weeks. You should also contact the centre if you have metal implants in your lower spine or hips.

There is no need for any special preparation, and you can take the scan fully clothed, provided that you don't have any metal zips in your trousers. You will be asked to lie still on a padded table, and breathe normally. It is an open scan, so there is no need to worry about closed spaces.

The radiographer may place special pads underneath or alongside your body to ensure proper positioning and comfort. The scan lasts for several minutes whilst the arm of the machine passes over the region of your body being scanned.

The full assessment takes approximately 30 minutes and includes a questionnaire about your diet, lifestyle, family history and general health. The actual scan takes around 10 minutes.

Our expert radiologists will use the results of the questionnaire and your scan results to produce a report for your doctor and yourself. This will be complete in approximately 2-3 days. If necessary, you may contact your doctor to follow up with prevention and/ or treatment advice.

If you have any other questions, worries or doubts, do not hesitate to ask one of the staff, we want you to feel as comfortable as possible.