DEXA Data Interpretation & Reporting

Question 1

What does a T-score represent?

Accepted Answer

Comparison to young adult average

Answer

A T-score in DEXA scanning compares a patient's Bone Mineral Density (BMD) to the average BMD of a healthy young adult of the same sex at peak bone mass. This score is used to diagnose osteoporosis or osteopenia in postmenopausal women and men over 50. It helps assess the risk of fractures based on bone density relative to a healthy reference population.

Question 2

What does a Z-score compare?

Accepted Answer

Bone density of age-matched peers

Answer

A Z-score in DEXA scanning compares a patient's Bone Mineral Density (BMD) to the average BMD of individuals of the same age, sex, and ethnic background. This score is primarily used for children, premenopausal women, and men under 50 to determine if their bone density is lower than expected for their age, helping identify secondary causes of low bone mass.

Question 3

What T-score indicates osteoporosis?

Accepted Answer

Below -2.5

Answer

According to the World Health Organization (WHO) criteria, a T-score of -2.5 or lower indicates osteoporosis. This signifies significantly reduced bone mineral density, placing the individual at a high risk for fragility fractures. T-scores between -1.0 and -2.5 indicate osteopenia, or low bone mass.

Question 4

What should be included in a DEXA report?

Accepted Answer

BMD, scan site, interpretation

Answer

A comprehensive DEXA report should include the measured Bone Mineral Density (BMD) values for all scanned sites (e.g., lumbar spine, hip), along with the corresponding T-scores and Z-scores. Crucially, it must also contain a clear interpretation of these findings by a qualified physician, including diagnostic classification and recommendations.

Question 5

Why is follow-up recommended?

Accepted Answer

Monitor changes over time

Answer

Follow-up DEXA scans are recommended to monitor changes in bone mineral density over time, especially for patients diagnosed with osteopenia or osteoporosis, or those undergoing treatment. These scans allow healthcare providers to assess the effectiveness of interventions, track disease progression, and adjust treatment plans as needed to prevent fractures.

(DEXA) DEXA Bone Density Scan Certification Practice Test

(DEXA) DEXA Bone Density Scan Certification Practice Test

DEXA Data Interpretation & Reporting