Dual energy x-ray absorptiometry
(Redirected from DEXA Scan)
<languages /><translate> An X-ray test used to measure bone density and check for osteoporosis.
Pronunciation[edit | edit source]
MIH-neh-rul DEN-sih-tee skan
Other names[edit | edit source]
Also called BMD scan, DEXA, DEXA scan, dual energy x-ray absorptiometric scan, dual x-ray absorptiometry, and DXA.
How is it performed?[edit | edit source]
An imaging test that measures bone density, or the the amount of bone mineral contained in a certain volume of bone) by passing x-rays with two different energy levels through the bone.
Clinical use[edit | edit source]
It is used to diagnose osteoporosis (decrease in bone mass and density).
Indications[edit | edit source]
A DEXA scan or bone mineral density scan is indicated in the following conditions:
- Diagnose osteopenia
- Diagnose osteoporosis
- Predict risk of future fractures
- See if treatment for osteoporosis is working
Who needs a DEXA scan?[edit | edit source]
- Most women age 65 or older should have a bone density scan.
- Women in this age group are at high risk for losing bone density, which can lead to fractures.
Risk factors for low bone density[edit | edit source]
- Have a very low body weight
- Have had one or more fractures after the age of 50
- Have lost a half inch or more in height within one year
- Are a man over the age of 70
- Have a family history of osteoporosis
- Lack of physical activity
- Smoking cigarettes
- Heavy drinking
- Not getting enough calcium and vitamin D in your diet
Process of getting tested[edit | edit source]
During a DEXA scan, you would be on a table just like when you get an X-ray
Risks[edit | edit source]
A bone density scan uses very low doses of radiation. It is safe for most people.
Contra-indications[edit | edit source]
A DEXA scan, due to use of X-rays, is not recommended for pregnant woman as even low doses of radiation could harm an unborn baby.
What is T-score?[edit | edit source]
- Bone density results are often given in the form of a T score.
- A T score is a measurement that compares your bone density measurement with the bone density of a healthy 30-year-old.
- A low T score means you probably have some bone loss.
Normal and abnormal values[edit | edit source]
A T score of -1.0 or higher is considered normal bone density. A T score between -1.0 and -2.5 means you have low bone density or osteopenia and may be at risk for developing osteoporosis. A T score of -2.5 or less means you probably have osteoporosis.
What is osteoporosis?[edit | edit source]
Osteoporosis is a bone disease. As we age, after 30 years, the bone mineral density gradually goes down.
Prevention[edit | edit source]
- Add more calcium and vitamin D to your diet
- Get more physical activity
- Take medicine to slow down bone loss
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