Understanding T-Scores and Z-Scores

The Z score compares your bone density to what’s expected for someone your age, sex, and body size. It’s especially useful for premenopausal women, men under 50, and children.

• A Z score above -2.0 is typically considered within the expected range.
• A Z score below -2.0 may indicate something abnormal is contributing to bone loss, such as a medical condition or medication.

In contrast…

T score vs Z score in bone density: What’s the difference?

• T score: Compares your bone density to a healthy 30-year-old of the same sex.
• Z score: Compares your bone density to someone your same age and size.

Doctors typically use:

• T scores to diagnose osteopenia or osteoporosis
• Z scores to investigate unusual bone loss patterns, especially in younger patients

What Does a Bone Density Test Show?

A DEXA scan provides more than just a number. It can reveal:

• Bone Mineral Density (BMD) in grams per cm²
• T score: for diagnosing bone loss
• Z score: for identifying unexpected bone issues
• Fracture risk based on your current density levels

These results help determine if you’re at risk and how aggressively you should act.

How Often Should You Get a Bone Density Test?

At Kalos, we follow Core Rule #1:

You should get a DEXA scan every month, or at least every other month for meaningful health tracking. Anything less frequent makes it hard to adjust your fitness, diet, or supplements in time to make a difference.

Who Should Get a Bone Density Test?

You may need a DEXA scan if you:

• Are a woman over 40
• Have a family history of osteoporosis
• Have had a fracture from a minor fall
• Are experiencing postmenopausal changes
• Take medications like steroids or thyroid treatments
• Follow a restrictive diet or have an eating disorder history

Even if you feel fine, a DEXA scan helps you catch problems before they become serious.

What Is the Z Score Bone Density Threshold for Concern?

• A Z score below -2.0: Suggests further evaluation is needed. Your doctor may recommend blood tests or investigate secondary causes of bone loss.
• A Z score within normal limits: Indicates your bone density is in line with your age group—but you may still need to monitor your T score for osteoporosis risk.

Where to Get the Most Accurate Bone Density Test Near You

Searching for a bone density test near me? At Kalos, we use medical-grade DEXA scan equipment to deliver ultra-precise results—no insurance referrals required. You’ll get both T and Z scores, expert interpretation, and a tailored plan to protect and improve your bone health.

Book Your DEXA Scan in San Francisco at Kalos Today

If you’re ready to take control of your bone health and overall longevity, a DEXA Scan in San Francisco at Kalosis the smartest place to start. In just six minutes, you’ll uncover critical data about your bone density, fracture risk, and long-term health.

Schedule your scan today at Kalos - where data meets performance.

‍