DEXA

the number shows the amount of bone you have compared with a young adult of the same gender with peak bone mass.

T-score

Contraindications for DEXA scan: 1. ___ 2. pt who has had another ___ ___ which uses ___ in the last 7 days ( barium enema, upper GI, CT, bone scan)

1. Pregnancy 2. imaging modality, contrast

Limitations of DEXA: 1. cannot predict who will experience a ____ but can provide indications of ___ ___ 2. Limited use on people who have had previous ____ ___, and ____ ___ or ____ may interfere with the accuracy

-fracture, relative risk -spinal surgery, compression fractures, osteoarthritis

patient instructions for DEXA scan: 1. stop taking ___ supplements ___ hours before test 2. do not take ____ for ___ on day of test (causes false increase density of bone)

1. calcium, 48 2. medications, osteoporosis

Person would have to lose ___% of their bone density before it shows up on plain film radiography

30

a T-score above -1 is considered ____

normal

DEXA used to diagnose or monitor treatment of _____, as well as determine risk ____

osteoporosis, fracture

the DXA machine sends a thin, invisible beam of low-dose x-rays with two distinct energy peaks through the bone being examined. One peak is absorbed mainly by ___ ___ and the other by ___. The soft tissue amount can be subtracted from the total and what remains is a patient's ___ ____ ___

soft tissue, bone, bone mineral density

the T-score is used to estimate your risk of developing a ____

fracture

DEXA measures ____ ___ ___ = ___ ___

bone mineral density = bone densitometry

this number reflects the amount of bone you have compared with other people in your age group and of the same size and gender

Z-score

DEXA is performed on the ___ ___ or ___

lower spine, hips

A T-score between -1 and -2.5 is classified as ____ (___ ___ ___)

osteopenia (low bone mass)

A T-score below -2.5 is defined as ____

osteoporosis

benefits of DEXA scans: 1. easily obtained 2. minimal ___ dose 3. ___ (less than ___ minutes) 4. ___ ___

radiation, quick, 10, cost effective

True or False, DEXA is more accurate than x-ray

true