What is a Dexa Scan and why is it important?
Dexa scanning stands for “Dual Energy X-ray Absortiometry.” This test is currently the most widely used test in measuring bone mineral density. It is a critical test in determining whether or not a patient is suffering from osteoporosis. Additionally, the dexa scan is considered extremely accurate.
The test itself is a simple scanning procedure that involves the patient lying down on an examining table and the scanner taking an x-ray. It is painless. Specifically during the scan, the scanner sends and directs x-ray energy at a set frequency from two different sources towards the bone that is being scanned. The doctor then is able to read from the results, the bone mineral density found in the bone scanned. This leads to an extremely accurate diagnosis of osteoporosis or not.
The dexa scan is highly recommended for women over age 65, as well as for women that are post menopausal, have had complete hysterectomies, or those individuals who have suffered certain types or frequent bone fractures. Other risk factors that might trigger your doctor advising you to have this test are:
- A family history of osteoporosis (mom, dad, grandparent, sister, brother or aunt)
- A family history of hip fracture
- Any fragility fracture after age 40 in yourself or a close relative (mom, sister, grandparent or aunt)
There are a certain group of individuals who should not have the Dexa Scan test. These are
- Women who are pregnant or who think they might could be pregnant
- Anyone who has had another “contrast x-ray” within the last seven days (examples--upper GI test, CAT scans…)
- Anyone who has had a nuclear scan within the last seven days (examples--bone scan, thyroid study…)
The dexa scan is used to measure bone mineral density as opposed to a regular x-ray or CAT scan for a variety of reasons. First, the dexa scan is extremely accurate; even more so than an x-ray. For bone density loss to show up on a regular x-ray, a person would have to lose 20-30% of their bone mass. Second, the dexa scan requires much less radiation exposure than a CAT scan or “regular” x-ray (Radiographic Absorptiometry). Ironically and interestingly, a person is exposed to more radiation on a “coast-to-coast” airline flight than during a dexa scan! Lastly, dexa scans are much less costly than other tests. The current cost (January 2008) for a dexa scan is around $250.00. Thus, if you do not have insurance, it might be worth your while to have this test if your doctor advises it or you are in one of the risk groups listed above.
Stop Vitamins and Medications the Day Before the Dexa Scan
In preparing for the test, as suggested above, it is quite simple. The one thing worthy of note and vitally important, however is calcium supplements. If you are taking calcium supplements (which is good) stop taking them 48 hours before your scheduled test. Additionally, if you are taking any medications for osteoporosis, do not take this the day of your test. Of course, if your doctor tells you differently, go by your doctor’s recommendations. Usually, normal drinking and eating is allowed, even on the day of the test.
Usually the nurse will suggest you wear loose clothing with no metal zippers or metal buttons or else you will have to disrobe. In regard to jewelry, as with any type of x-ray or scan, you will have to remove it prior to the test.
The dexa scan is a fantastic test for measuring bone mineral density. It is affordable, painless and extremely accurate. Most definitely this is a test worthy of your time in relation to osteoporosis diagnosis and treatment.
Osteoporosis Treatment: Find One The is Safe and Effective
