What is a bone mineral density test?

Summary

Rea, a radiologist at MD Anderson, explains the bone mineral density test, known as a DEXA scan. This painless procedure is one of the most accurate methods for assessing bone health, detecting conditions like osteoporosis, and evaluating fracture risk. During the scan, patients lie on a cushioned table while a mechanical arm scans the hip and spine, emitting a low dose of radiation. There’s no special preparation needed, and results are typically available within two days. Rea encourages patients to contact the Diagnostic Imaging Center for any questions about the procedure.

Takeaways

• 😀 A DEXA scan measures bone mineral density and assesses bone health.
• 😀 The test is crucial for detecting osteoporosis, which weakens bones and increases fracture risk.
• 😀 MD Anderson uses dual-energy x-ray absorptiometry for accurate bone density measurement.
• 😀 The radiation exposure during a DEXA scan is very low, about 1/10th of a chest x-ray.
• 😀 No special preparation is needed; you can eat and drink normally before the test.
• 😀 Patients should wear a gown and remove any metal items, like buttons or zippers, before the scan.
• 😀 Pregnant individuals should inform their healthcare provider as the scan involves radiation.
• 😀 If you've had recent radiologic tests with oral contrast dye, wait one week before the DEXA scan.
• 😀 The scan itself takes about 20 minutes and is painless, though some positioning may cause discomfort.
• 😀 Results are typically available within two days and will be discussed at your next appointment.

Q & A

What is a DEXA scan?

A DEXA scan, or bone mineral density test, is a highly accurate method for assessing bone health, measuring bone loss over time, and detecting osteoporosis.

Why is a DEXA scan important?

It helps evaluate the risk of fractures by assessing bone density, which is crucial for identifying osteoporosis.

How does a DEXA scan work?

It uses dual-energy x-ray absorptiometry to measure bone density in areas such as the hip and spine, with very low radiation exposure.

Is there any special preparation required before a DEXA scan?

No special preparation is needed; you can eat and drink normally before the test.

What should I wear for a DEXA scan?

You should change into a gown and remove any clothing with metal, such as buttons or zippers.

What should I inform my healthcare provider before the scan?

You should inform them if you are pregnant or think you might be, as the radiation could affect a developing fetus.

How long does the DEXA scan take?

The scan typically takes about 20 minutes to complete.

What can I expect during the scan?

You will lie on a cushioned table while a mechanical arm passes over you, producing low-level radiation without any physical contact.

When will I receive the results of the DEXA scan?

Results are usually available after two days, and your doctor will discuss them at your next appointment.

Is there anything I need to do after the DEXA scan?

There is no need to stay after the exam, and you can resume your normal activities immediately.