DXA Scan Analysis

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A bone density test is the primary exam used to diagnose osteoporosis. According to the National Osteoporosis Foundation (2016), “a bone density test is the only test that can diagnose osteoporosis before a broken bone occurs.” A DXA scan is a type of bone density test and it stands for dual energy x-ray absorption. The DXA scan analyses the bone density in the hip and spine. The DXA machine sends a beam of low dose x-rays into the bones being examined. The soft tissues absorb a portion of the x-ray and the bones absorb the rest. The amount of energy absorbed by the soft tissues can be subtracted from the total amount introduced into the body and the remaining amount is the bone mineral density. To perform a DXA scan, the patient is …show more content…

Positioning of the patient is crucial to perform a diagnostic study, so the patient’s knees will be bent to keep the spine in contact with the exam table and the foot will need to be rotated slightly inward to rotate the greater trochanter of the hip outward. The technologist will then move a mechanical arm over the patient and place it over the area being examined. When the exam begins, the arm will move over the patient slowly as it takes the measurements. It usually takes at most thirty minutes to perform the exam. A radiologist usually interprets the exam, but a rheumatologist or endocrinologist can interpret these studies as well. A signed report will be sent to the patients referring physician upon completion of their interpretation. The results will contain two scores, a T score and a Z score. The T score “shows the amount of bone you have compared with a young adult of the same gender with peak bone mass” (American College of Radiology, 2016). A score of -1 is considered normal, a score of -1 to -2.5 is considered osteopenia, low bone mass, and below -2.5 is osteoporosis. The Z score is the amount of bone you have compared to other their people in your age group of the same size and

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