FRAX Score Interpretation: What Your 10-Year Risk Actually Means

What does a FRAX score actually mean?

It is the probability that you will break a bone in the next ten years — nothing more specific than that, and nothing less useful.

The Royal Osteoporosis Society puts it plainly: the assessment "uses your answers to calculate your risk of breaking a bone in the next 10 years", and "The result of your assessment is given as a percentage, which shows the probability of you breaking a bone in the next 10 years." Royal Osteoporosis Society

The word doing the work is probability. A FRAX result of 14% does not mean something will happen to you, and it does not mean you are 14% broken. It means that out of a large group of people sharing your risk profile, roughly fourteen in a hundred would sustain such a fracture over a decade — and you are somewhere in that group without knowing where.

This is why a FRAX score is genuinely useful for deciding what to do and genuinely useless for predicting your future. It is a decision aid.

You get two numbers — which one matters?

FRAX returns the 10-year probability of hip fracture and of major osteoporotic fracture, which NOGG defines as "a clinical spine, hip, forearm or humerus fracture". NOGG, 2024

People often assume the bigger-sounding number is the one to worry about, or that you average them. Neither is right. NOGG is specific:

"When BMD is included in a FRAX assessment, the patient's risk (high, very high or low) is determined by the higher of the two (MOF and hip fracture) risk assessments." NOGG, 2024

The more concerning of your two percentages is the one that drives the decision. Hip fracture probability is always the smaller number in absolute terms — hip fractures are rarer than wrist fractures — but it is reported separately precisely because the consequences are so much greater.

The four UK risk categories

This is where a raw percentage turns into an actual plan. UK guidance sorts FRAX results into four bands, set by two cut-offs: "The intervention threshold (IT) and very high-risk threshold (VHRT) denote the thresholds for high and very high risk." NOGG, 2024

Category	What NOGG says should happen
Low	"Can be reassured that their fracture risk is low and offered lifestyle advice as appropriate"
Intermediate	"Should be referred for BMD measurement, if practical. Thereafter, fracture probability should be reassessed using FRAX"
High	DXA scan and consideration of drug treatment
Very high	"Should be considered for specialist referral"

NOGG, 2024

Two things are worth drawing out of that table.

Intermediate isn't a holding pattern — it's an instruction to go and measure. The recommended action is a bone density scan, then re-running FRAX with the new information. That is the single most common real-world outcome of a first FRAX assessment, and it is why so many people are sent for a scan after a calculation they thought was the end of the process.

Low risk still comes with advice. The guideline pairs reassurance with lifestyle advice rather than simply closing the file.

Why isn't there just one "high" number?

Because the same percentage means different things at different ages.

This is the most common source of confusion about FRAX results, and it trips people up when they compare scores with a friend or look for a magic number online. A 10-year fracture probability that is genuinely alarming in a 55-year-old is close to expected in an 80-year-old, simply because age itself is one of the largest drivers of the calculation. A fixed cut-off applied across all ages would over-treat the old and under-treat the young.

UK thresholds are therefore age-dependent rather than a single figure, which is why this article explains the categories rather than quoting a number at you. Your clinician reads your result against the threshold for your age — and that is the interpretation that counts.

If you have a percentage in front of you and no category, that is the question to ask: which band does this put me in?

A FRAX score is not an osteoporosis diagnosis

These get conflated constantly, and they are genuinely different things measuring different quantities.

• Osteoporosis is a diagnosis based on measured bone mineral density — see DEXA scan results and T-scores explained.
• A FRAX score is an estimate of fracture probability, which can be driven high by age, a previous fracture or long-term steroids even with no density measurement at all.

You can have a high FRAX score without a confirmed osteoporosis diagnosis. You can also have osteoporosis on a scan and a FRAX score that looks unremarkable. The usual resolution is the same in both directions: measure the bone, then reassess.

One thing not to do with your score

Don't carry a FRAX percentage across to a different calculator's thresholds.

FRAX is not the only fracture risk tool in UK use — the Royal Osteoporosis Society names "a FRAX® or QFracture® test" as the tools doctors use. Royal Osteoporosis Society Both produce a 10-year percentage, which makes them look interchangeable. They are not. NOGG states that its intervention thresholds, "recommended by NICE Quality Standards, are based on FRAX probability and thus cannot be used with fracture risk derived from QFracture or other calculators." NOGG, 2024

Same-looking number, different scale. Worth knowing if you have results from more than one source.