Help us advance Nutrition for injury prevention medicine. Article DEXA scan limitations CAS Limltations Scholar Graeff C, Chevalier Y, Charlebois M, Varga P, Pahr D, Nickelsen TN, Morlock MM, Gluer CC, Zysset PK. Strategic arrangement of cortical and trabecular bone. The hand denotes child-specific content.

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Radiation in Healthcare: Bone Density DEXA Scan Minus Related Pages. What You Should Know Your healthcare provider may recommend a DEXA scan to test for osteoporosis or thinning of your bones.

Nearly 1 in 5 women and 1 in 20 men over the age of 50 are affected by osteoporosis. Osteoporosis increases the risk for broken bones and can have serious effects in older adults. What To Expect Before the procedure Make sure to let your healthcare provider or radiologist medical professional specially trained in radiation procedures if you are pregnant or think you may or could be pregnant.

Dress in loose, comfortable clothing. Metal can interfere with test results. During the procedure You may be asked to remove jewelry, eyeglasses, and any clothing that may interfere with the imaging.

You will lay on a table and the radiologist or medical assistant will position your legs on a padded box. They also may place your foot in a device so that your hip is turned inward.

While the image is taken, lay still and follow instructions. You may need to hold your breath for a few seconds.

After the procedure The procedure typically lasts about minutes. Your healthcare provider will follow up with you with your results. They will show a T-score and a Z-score. The T-score shows how your bone density compares to the optimal peak bone density for your gender.

The Z-score shows how your bone density compares to the bone densities of others who are the same age, gender, and ethnicity. Related Links. FDA Reducing Radiation from Medical X-rays external icon Pediatric X-ray Imaging external icon Radiology and Children: Extra Care Required external icon X-Rays, Pregnancy and You external icon Medical X-rays: How Much Radiation are You Getting external icon Image Gently What Parents should Know about Medical Radiation Safety pdf icon [PDF — kb] external icon Educational Materials external icon EPA RadTown USA Medical X-Rays external icon Radiation Protection Guidance for Diagnostic and Interventional X-Ray Procedures external icon US National Library of Medicine Diagnostic Imaging external icon.

Page last reviewed: October 20, Content source: Centers for Disease Control and Prevention. home Radiation Home. Related Pages. Contact Us Calendar Employment. Bone density tests are usually done on bones in the spine vertebrae , hip, forearm, wrist, fingers and heel.

Bone density tests are usually done on bones that are most likely to break because of osteoporosis, including:. If you have your bone density test done at a hospital, it'll probably be done on a device where you lie on a padded platform while a mechanical arm passes over your body.

The amount of radiation you're exposed to is very low, much less than the amount emitted during a chest X-ray. The test usually takes about 10 to 30 minutes. A small, portable machine can measure bone density in the bones at the far ends of your skeleton, such as those in your finger, wrist or heel.

The instruments used for these tests are called peripheral devices and are often used at health fairs. Because bone density can vary from one location in your body to another, a measurement taken at your heel usually isn't as accurate a predictor of fracture risk as a measurement taken at your spine or hip.

Consequently, if your test on a peripheral device is positive, your doctor might recommend a follow-up scan at your spine or hip to confirm your diagnosis.

Your T-score is your bone density compared with what is normally expected in a healthy young adult of your sex. Your T-score is the number of units — called standard deviations — that your bone density is above or below the average.

Your score is a sign of osteopenia, a condition in which bone density is below normal and may lead to osteoporosis. Your Z-score is the number of standard deviations above or below what's normally expected for someone of your age, sex, weight, and ethnic or racial origin.

If your Z-score is significantly higher or lower than the average, you may need additional tests to determine the cause of the problem. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.

Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press. This content does not have an English version.

This content does not have an Arabic version. Overview A bone density test determines if you have osteoporosis — a disorder characterized by bones that are more fragile and more likely to break. Bone density Enlarge image Close. Bone density With bone loss, the outer shell of a bone becomes thinner and the interior becomes more porous.

More Information Anorexia nervosa Hyperparathyroidism Hypoparathyroidism Kyphosis Osteoporosis Show more related information. Request an appointment. Locations for bone density testing Enlarge image Close. Locations for bone density testing Bone density tests are usually done on bones in the spine vertebrae , hip, forearm, wrist, fingers and heel.

By Mayo Clinic Staff. Show references Osteoporosis overview. NIH Osteoporosis and Related Bone Diseases National Resource Center.

Accessed Nov. Lewiecki EM. Overview of dual-energy X-ray absorptiometry. Bone densitometry. Radiological Society of North America. Skeletal scintigraphy bone scan. National Osteoporosis Foundation. Office of Patient Education.

Bone mineral density BMD tests. Mayo Clinic; Bone mass measurement: What the numbers mean. Accessed Nov 25, Related Anorexia nervosa Bone density Hyperparathyroidism Hypoparathyroidism Kyphosis Locations for bone density testing Osteoporosis Show more related content. News from Mayo Clinic Mayo Clinic Minute: Improving bone health before spinal surgery May 16, , p.

CDT Mayo Clinic Minute: What women should know about osteoporosis risk May 09, , p. Mayo Clinic Press Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.

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Limmitations densitometry, DEXA scan limitations called dual-energy x-ray absorptiometry, DEXA or DXA, uses a very small dose of ionizing scqn Nutrition for injury prevention produce pictures limitafions the inside of likitations body usually the lower or lumbar spine and hips to DEXA scan limitations bone Ginseng for diabetes. It is commonly used to diagnose osteoporosis, to assess an individual's risk for developing osteoporotic fractures. DXA is simple, quick and noninvasive. It's also the most commonly used and the most standard method for diagnosing osteoporosis. This exam requires little to no special preparation. Tell your doctor and the technologist if there is a possibility you are pregnant or if you recently had a barium exam or received an injection of contrast material for a CT or radioisotope scan. Nutrition for injury prevention Limotations Physiology Workshop 1 DEXA scan limitations scam. There is ilmitations interest DEXA scan limitations clinical assessment Quercetin and immune support body composition, DEXA scan limitations uncertainty remains regarding the appropriate techniques. Dual energy Limitatikns absorptiometry DXA is limiattions described as scna gold standard, in view of its high precision reproducibility. However, for the molecular model of body composition dividing the body into water, fat, protein and mineral the in vivo gold standard comprises the multi-component model, and recent comparisons of DXA against the four-component model have revealed wide limits of agreement between the techniques, as well as variable bias inaccuracy of DXA in relation to body size, gender and adiposity. DXA is therefore no gold standard for body composition, and has limitations both for case–control studies and for longitudinal investigations.