PATIENT ASSESSMENT: DEXA SCANS 2025/2026
QUESSTIONS AND ANSWERS | 100% CORRECT!!
What is the Gold Standard for diagnosing and screening for Osteoporosis
Answer - DEXA (Dual-Energy XRAY Absorptiometry)
DEXA Scans measure Bone Density in what locations? Answer - 1) Lumbar
Spine
2) Total Hip
3) Femoral Neck
4) Distal 1/3 of Radius
Measuring Bone Density at which location is the best predictor for Hip
Fractures Answer - Femoral Neck
What is a Fragility Fracture? Answer - Fracture from forces that would not
usually cause a fracture
ex) Fall from standing height
How to Calculate Areal BMD (g/cm^2) Answer - BMD =
(Bone Mineral Content - Grams) /
(Bone Area - Centimeters)
, What is a T-Score and how is it calculated? Answer - BMD compared to Healthy
Young Adults
T-Score =
(Patient's BMD - Mean BMD of Young Adult Reference) /
(SD of Young Adult Population)
What is a Z-Score and how is it calculated? Answer - BMD compared to Age-
Matched Adults
Z-Score =
(Patient's BMD - Mean BMD of Age, Ethnic, Sex Reference) /
(SD of Reference Population)
Which Value is used to Diagnose Osteoporosis? Answer - T-Score
Which Value is used to Differentiate bone loss secondary to age or underlying
diseases/conditions? Answer - Z-Score
List the T-Score Values for the following:
Normal, Osteopenia, Osteoporosis, Severe Osteoporosis Answer - Normal: > /
= (-1.0)
Osteopenia: (-1.0) to (-2.5)
Osteoporosis: < / = (-2.5)
QUESSTIONS AND ANSWERS | 100% CORRECT!!
What is the Gold Standard for diagnosing and screening for Osteoporosis
Answer - DEXA (Dual-Energy XRAY Absorptiometry)
DEXA Scans measure Bone Density in what locations? Answer - 1) Lumbar
Spine
2) Total Hip
3) Femoral Neck
4) Distal 1/3 of Radius
Measuring Bone Density at which location is the best predictor for Hip
Fractures Answer - Femoral Neck
What is a Fragility Fracture? Answer - Fracture from forces that would not
usually cause a fracture
ex) Fall from standing height
How to Calculate Areal BMD (g/cm^2) Answer - BMD =
(Bone Mineral Content - Grams) /
(Bone Area - Centimeters)
, What is a T-Score and how is it calculated? Answer - BMD compared to Healthy
Young Adults
T-Score =
(Patient's BMD - Mean BMD of Young Adult Reference) /
(SD of Young Adult Population)
What is a Z-Score and how is it calculated? Answer - BMD compared to Age-
Matched Adults
Z-Score =
(Patient's BMD - Mean BMD of Age, Ethnic, Sex Reference) /
(SD of Reference Population)
Which Value is used to Diagnose Osteoporosis? Answer - T-Score
Which Value is used to Differentiate bone loss secondary to age or underlying
diseases/conditions? Answer - Z-Score
List the T-Score Values for the following:
Normal, Osteopenia, Osteoporosis, Severe Osteoporosis Answer - Normal: > /
= (-1.0)
Osteopenia: (-1.0) to (-2.5)
Osteoporosis: < / = (-2.5)
