Osteoporosis Diagnosis: What's Really Important to Know

Osteoporosis diagnosis is not only necessary when a fracture has already occurred. The problem is that osteoporosis can be asymptomatic for a long time and is often first manifested by a fracture. Therefore, the key task of diagnosis is to detect a decrease in bone density before a serious injury occurs, especially in people with age or risk factors.

Most often, when talking about diagnosing osteoporosis, they mean densitometry - DXA or DEXA scan. This method is considered the main and most reliable for assessing bone mineral density, especially in the hip and spine. The examination is quick, painless, non-invasive and uses low doses of X-ray radiation.

What does the patient's route look like if osteoporosis is suspected?

In practice, diagnosing osteoporosis is rarely a one-step process. First, the doctor assesses age, gender, menopausal status, history of fractures, smoking, low body weight, glucocorticoid use, or other risk factors. Then, if the risk is elevated, DXA densitometry may be recommended, and the results are interpreted together with the clinical picture and sometimes with a fracture risk assessment using clinical tools.

Table: what methods are included in the diagnosis of osteoporosis

This table is important for understanding one simple thing: diagnosing osteoporosis is not only densitometry, but also the correct interpretation of the results in the context of fracture risk and possible causes of bone loss.

DXA densitometry: the main test for osteoporosis

In short, DXA is the gold standard for assessing bone mineral density. The lumbar spine and femoral neck are the most commonly scanned areas because these are the areas best suited to assess future fracture risk. Peripheral devices that measure density at the heel or wrist may be useful for screening, but they are less suitable for accurately predicting fractures and monitoring treatment.

Another advantage of DXA is that it doesn't require any special preparation. The NHS says the procedure is quick and painless, and no special preparation is usually needed. Sometimes, it's enough to come in comfortable clothes without metal fasteners or change clothes before the scan.

What does T-score mean and how to read the result

After densitometry, the patient most often sees a T-score in the report. This indicator is used to assess how much your bone density differs from the average level in young healthy people. If the T-score is -1 or higher, this is considered normal; from -1 to -2.5 - this is osteopenia; -2.5 and below - a sign of osteoporosis. It is also known that with each decrease in the T-score by 1 point, the risk of fractures increases significantly.

For the reader, this means something important: osteopenia is not osteoporosis, but it is a signal that bone mass is reduced and the risks may increase with age or in the presence of additional factors. That is why the same result can be interpreted differently in different people: for someone, observation and prevention are enough, while for someone, more active tactics are needed.

Who should get diagnosed with osteoporosis?

According to the updated 2025 USPSTF recommendation, osteoporosis screening is recommended for all women aged 65 years and older. For postmenopausal women younger than 65 years, screening is also recommended if one or more risk factors are present and clinical assessment indicates an increased risk of osteoporotic fracture. For men, the evidence is not yet sufficient to make a universal recommendation for population-based screening, so the decision is more likely to be made on an individual basis.

In addition to age, reasons to consider diagnosing osteoporosis include a fracture from a minor trauma, short stature, long-term use of glucocorticoids, low body weight, smoking, or other risk factors. In clinical practice, densitometry may also be recommended for people over 50 years of age with suspected increased risk of bone fragility.

Is densitometry alone enough?

Not always. Although the diagnosis of osteoporosis is based on DXA, decisions about further tactics are not made based on one number alone. In real life, age, gender, previous fractures, comorbidities, and individual fracture risk are taken into account. That is why the densitometry result is often considered together with the clinical assessment of fracture risk, and not in isolation.

It is also important to remember that a regular X-ray is not as good as DXA for early diagnosis of osteoporosis. But it can be useful if there is already a suspicion of a fracture, especially a compression fracture of the vertebra. That is, an X-ray more often helps to see the consequences of osteoporosis, and not to detect early loss of bone density. This is another reason why densitometry is so important in preventive diagnostics.

Are blood tests needed?

When people seek a diagnosis of osteoporosis, they often expect there to be an «osteoporosis blood test.» In fact, there is no standard single test that confirms osteoporosis in the same way as DXA. But tests may be needed if the doctor wants to rule out secondary causes of bone loss — such as endocrine disorders or other diseases that affect the bones. That is why laboratory tests do not replace densitometry, but complement it in certain clinical situations.

Osteoporosis diagnosis works best when a person is not waiting for the first fracture. If there is age, risk factors, or concerns after menopause, it is better to discuss densitometry in a timely manner. In this topic, it is not only the presence of the disease today that is important, but also the risk of fractures tomorrow - and this is what makes early screening truly valuable.

Author: Ulyana Anatolyivna Dzyuba

Director of Medi Lab Plus LLC, a doctor of the highest category. Has over 45 years of practical experience in medicine and laboratory diagnostics. Founder and head of the laboratory since 2007. More details…