How to Read a Bone Density Scan

A bone density scan, also known as DXA scan, is a test used to measure bone strength. It can determine whether you have osteoporosis (brittle bones) or osteopenia (less severe than osteoporosis). The scan requires the patient to lay on a table for about 20 minutes while an X-ray machine scans his or her spinal bones, hip bones and wrist bones. The bone scan generates scores for the bones called the T-score and Z-score measured in standard deviation (SD). According to the Mayo Clinic, the T-score is a value that compares bone strength to normal bone strength values. The Z-score is a value that compares the patient's bone strength to the normal bone strength of someone the same age, race and gender.

Things You'll Need

• Bone density scan results

Instructions

1. Read your T-score value. Compare it to the T-scores expected in a normal patient (-1 or higher SD), osteopenic patient (between -1 and -2.5 SD) and osteoporotic patient (below -2.5 SD).

2. Read your Z-score. Call your doctor if your Z-score is below -1.5 SD. This means that your low bone density is due to another medical condition other than menopause or aging.

3. If your test reveals that you have osteoporosis or osteopenia, discuss treatment options with your doctor. Continue to eat and drink products rich in calcium to improve your bone strength.

References

• Oscal
• Mayo Clinic