BMD T Score (Right Femoral Neck)

One in two women and one in four men over fifty will break a bone because of weak bones, and the hip is the break that changes everything. A hip fracture can end independence, mobility, and sometimes life itself. The right femoral neck T-score is the number that tells you, years in advance, whether your hip is heading in that direction.

This is a measurement of bone strength at the narrow part of your upper thigh bone where it meets the hip joint, the exact spot where most hip fractures occur. It compares your bone density to that of a healthy 20 to 29 year old, giving you a single number that doctors, guidelines, and large studies have used for decades to decide who needs treatment.

How the Score Works

Your bone density is measured by a low-dose X-ray scan called DXA (dual-energy X-ray absorptiometry). The result is converted into a T-score by counting how many standard deviations your density sits above or below the peak density of a young adult. A score of zero means you match the young adult average. Negative numbers mean your bones are less dense; positive numbers mean denser.

World Health Organization thresholds, adopted globally and used by major labs and guidelines, split T-scores into three categories: normal, low bone mass (called osteopenia), and osteoporosis. These cutoffs apply to the right femoral neck just as they do to the left hip or lumbar spine.

Hip Fracture Risk

This is the headline finding. In a study of about 273,000 Asian women, each one-unit drop in hip T-score roughly doubled the risk of hip fracture. In a UK cohort of postmenopausal women followed for ten years, femoral neck DXA was a stronger predictor of hip fracture than measurements taken at the spine or wrist, with risk rising in a non-linear, accelerating way as scores fell.

What this means for you: the femoral neck is the single most informative bone site for predicting whether you will break your hip. A score of minus 2.5 is not a minor blip on a report. It signals roughly four times the fracture rate of someone with normal bone density.

Major Osteoporotic Fractures

Beyond the hip, lower femoral neck T-scores predict spine, wrist, shoulder, and other fragility fractures. A study of more than 42,000 adults found that the relationship between femoral neck T-score and major fracture risk was essentially identical in people with and without type 2 diabetes. The same threshold meant the same risk, regardless of diabetes status.

Many fractures still happen in people whose scores fall in the osteopenia range, not just full osteoporosis. In the BoMIC study of more than 7,000 older adults, most incident fractures occurred in people with T-scores above minus 2.5. This is why doctors do not treat the T-score in isolation but combine it with age, prior fractures, and other risk factors using tools like FRAX.

Beyond the Bones

Lower femoral neck T-scores also flag broader health risks. In a study of about 12,700 Asian women, T-score-defined osteoporosis roughly doubled the risk of atherosclerotic cardiovascular disease compared to normal bone density. In acute ischemic stroke patients, osteoporosis at the right femoral neck nearly tripled the odds of poor functional recovery at three months, with an odds ratio of 2.97 even after adjusting for age, sex, and stroke severity.

Bone is not isolated from the rest of your body. A low T-score often coincides with systemic processes (chronic inflammation, hormonal shifts, vascular aging) that affect more than the skeleton. Treating it as a hip-only number misses the larger signal.

Reference Ranges

These cutoffs come from World Health Organization criteria based on white young adult reference data and are adopted by major guideline bodies including the National Bone Health Alliance and the International Society for Clinical Densitometry. Different ethnic groups may benefit from slightly adjusted thresholds (research in older East Asians suggests cutoffs closer to minus 2.7 in some populations), and your specific DXA machine and lab may use slightly different references. Compare results from the same scanner over time for the most meaningful trend.

Note: Compare your results within the same lab and same scanner over time for the most meaningful trend. Small differences between machines can shift T-scores by 0.1 to 0.3 without any real change in your bones.

Right Versus Left Hip

Most DXA reports include measurements from both hips, the spine, and sometimes the forearm. Right and left femoral neck T-scores are highly correlated and usually agree on the diagnosis. In a study of more than 2,300 women, measuring both sides only changed the classification in a small minority of cases.

That said, using the lowest T-score from all measured sites (spine plus both hips) catches more cases of osteoporosis than relying on a single site. If your right femoral neck is normal but your spine or left hip is in osteoporosis range, the lowest number wins for diagnosis. Do not assume a normal right hip means your skeleton is in the clear.

Tracking Your Trend

A single T-score is a snapshot. What matters more is the direction of travel. Bone density changes slowly, so meaningful change usually takes one to two years to detect. The right femoral neck has a known measurement variability of roughly 1 to 2 percent on the same machine, meaning small changes can be noise rather than signal.

For tracking: get a baseline scan, retest in one to two years if you are at risk or starting treatment, and at least every two years thereafter. If you are on osteoporosis medication, repeat scans confirm whether the drug is working. If you are perimenopausal or just starting hormone changes, more frequent monitoring helps catch accelerated loss early. People with normal density and no risk factors can often wait longer, but having an early baseline gives you something to compare against decades later.

What to Do With an Abnormal Result

If your T-score lands in the osteopenia range (minus 1.0 to minus 2.5), the next step is to calculate your 10-year fracture probability using the FRAX tool, which combines your T-score with age, weight, prior fractures, smoking, and other clinical factors. A FRAX score above 3 percent for hip or 20 percent for major fractures usually triggers treatment consideration.

If your T-score is minus 2.5 or below, treatment is typically indicated regardless of FRAX. Companion workup should include vitamin D (25-hydroxy), calcium, parathyroid hormone (PTH), thyroid function (TSH), and a basic metabolic panel to look for secondary causes. In men or younger women with unexpectedly low bone density, testosterone (for men) or sex hormone testing and a celiac screen are reasonable additions. If your scores are dropping fast despite good lifestyle measures, an endocrinologist or rheumatologist can evaluate for less common causes including Cushing syndrome, multiple myeloma, or hyperparathyroidism.