You had the bone density test.

It was easy enough. You lay on a table while a scanner passed over you, and then you went home.

A few days later, the results appear.

T-score: –2.2. Osteopenia.

And unless someone explains what that means, you’re left staring at a negative number wondering:

Is that bad? Do I have osteoporosis? Am I going to break a bone?

Bone density results look much more complicated than they need to be.

Let’s make them understandable.

First, What Is a DXA Scan?

A DXA—sometimes written DEXA—is a bone mineral density test.

It uses a very small amount of radiation to measure the mineral content of your bones. The hip and spine are commonly measured because fractures in these areas can have significant consequences.

The test is quick, painless and noninvasive.

But the scan itself is only the beginning.

The important part is understanding the result.

What Is a T-Score?

For postmenopausal women and men age 50 and older, bone density is generally reported using something called a T-score.

Your T-score compares your bone density with the bone density of a healthy young adult.

Think of 0 as the reference point.

As the number becomes more negative, bone density is lower.

The general ranges are:

–1.0 or higher: Normal bone density

Between –1.0 and –2.5: Low bone density, often called osteopenia

–2.5 or lower: Osteoporosis

So a T-score of –1.3 and a T-score of –2.4 both fall into the osteopenia range—but they clearly don’t represent exactly the same amount of bone loss.

The number matters.

And according to the National Institutes of Health, fracture risk rises approximately 1.5 to 2 times for every one-point decrease in T-score.

That’s useful information, but it still doesn’t tell your entire story.

So What Exactly Is Osteopenia?

This word causes a lot of unnecessary worry.

Osteopenia means your bone density is lower than the range considered normal but has not reached the bone-density threshold used to define osteoporosis.

It doesn’t mean you’re inevitably progressing toward osteoporosis.

And it doesn’t mean a fracture is waiting around the corner.

It means:

Your bone density deserves attention.

For one person, that may mean looking at calcium and vitamin D intake, increasing appropriate weight-bearing and strengthening activity, working on balance and fall prevention, and following bone density over time.

For someone else with additional fracture risks, the conversation may be different.

That’s why the word osteopenia by itself isn’t enough to make every treatment decision.

And Osteoporosis?

A T-score of –2.5 or below generally falls into the osteoporosis range.

That tells your healthcare provider that your bone density has decreased significantly enough to raise concern about fracture risk.

But here’s something important:

A T-score isn’t the only way osteoporosis can be identified.

A person who has experienced certain fragility fractures—particularly a hip or spinal fracture—may be considered to have osteoporosis even if the T-score isn’t –2.5 or lower.

That makes sense when you think about it.

We’re not treating a number.

We’re trying to prevent broken bones.

Your T-Score Isn’t Your Fortune Teller

Patients sometimes see a low number and immediately assume the worst.

A T-score cannot tell you:

“You will break your hip.”

It tells us something about the strength of your bones and helps estimate your risk.

Your healthcare provider may also consider your age, previous fractures, family history, medications, smoking, alcohol use, medical conditions and likelihood of falling.

Sometimes a tool called FRAX is used to estimate the chance of having certain osteoporosis-related fractures over the next 10 years.

Two people with the same T-score can have very different overall fracture risks.

That’s why the conversation should be bigger than one number.

What About a Z-Score?

You may also see a Z-score on your report.

Unlike a T-score, which compares you with a healthy young adult, a Z-score compares your bone density with what’s expected in people of similar age, sex and other characteristics.

Z-scores are particularly important when evaluating younger adults and children.

A very low Z-score may prompt the healthcare provider to ask another question:

Is something else contributing to this person’s bone loss?

That could mean looking at medications or medical conditions that affect bone.

Again, the number is a clue.

Not the entire diagnosis.

Ask What Your Number Means for You

If someone tells you:

“You have osteopenia.”

Don’t let the conversation end there.

Ask:

What was my T-score?

Where was the lowest measurement—my hip or spine?

Has it changed since my previous scan?

What other fracture risks do I have?

Do I need treatment, or do we watch it?

When should the test be repeated?

Those questions turn a report into information you can actually use.

The Number Is There to Help You—Not Frighten You

I’ve always believed patients handle information better when someone actually explains what it means.

A T-score of –2.3 can look frightening when it appears in a medical record without context.

Once you understand it, it becomes something different.

Information.

It tells you where your bone density stands today.

It gives you and your healthcare provider something to follow.

And most importantly, it can give you an opportunity to protect your bones before a fracture is the thing that tells you there was a problem.

Next, we’ll look at something else patients often misunderstand:

Who actually gets osteoporosis?

Because it isn’t only little old ladies.

References

National Institute of Arthritis and Musculoskeletal and Skin Diseases. Bone Mineral Density Tests: What the Numbers Mean.

National Institute of Arthritis and Musculoskeletal and Skin Diseases. Osteoporosis: Diagnosis, Treatment, and Steps to Take.

Bone Health & Osteoporosis Foundation. Bone Density Testing.

Bone Health & Osteoporosis Foundation. Low Bone Density.