A FRAX score estimates your probability of certain fractures over the next ten years. It combines information about your age, health history, and other risk factors, sometimes with a bone-density measurement.
Your clinician may use it to help decide whether you need further assessment or osteoporosis treatment—particularly when your scan shows osteopenia.
The result is an estimate, not a prediction that a fracture definitely will or will not happen.
Affiliate disclosure: This article contains affiliate links. We may earn a commission if you purchase through them.
Exploring additional osteoporosis guidance? You can review this commercial program, including its claims and terms. A paid program cannot replace professional interpretation of your fracture risk.
What Does FRAX Measure?
FRAX stands for Fracture Risk Assessment Tool. It produces two ten-year probability estimates:
| FRAX result | What it covers |
|---|---|
| Hip fracture probability | The estimated chance of a hip fracture |
| Major osteoporotic fracture probability | The estimated chance of a hip, clinical spine, forearm, or upper-arm fracture |
“Major osteoporotic fracture” does not include every possible broken bone.
The two percentages should not be added together. Hip fractures are already included within the major osteoporotic fracture outcome.
A simple example
Suppose a report shows:
- Hip fracture probability: 4%
- Major osteoporotic fracture probability: 16%
A practical interpretation is that, among 100 people with a similar risk profile, approximately four would be expected to experience a hip fracture over ten years, while approximately sixteen would experience a major osteoporotic fracture.
This does not mean a 20% combined risk. It also does not tell you which individuals will fracture.
These figures are an illustration, not a personal assessment.
What Information Goes Into the Calculator?
The standard FRAX calculation considers factors including:
- Age and sex.
- Height and weight.
- Previous fracture.
- Parental hip fracture.
- Current smoking.
- Glucocorticoid use.
- Rheumatoid arthritis.
- Certain other causes of secondary osteoporosis.
- Alcohol intake of three or more units daily, using the tool’s definition.
- Femoral-neck bone mineral density, when available.
The calculator is designed for ages 40–90. A displayed result should not be treated as validated for someone outside that range.
FRAX also uses country-specific models because background fracture and mortality rates differ. The model selection matters; changing the language alone does not select the appropriate population model.
Can FRAX Be Used Without a DXA Scan?
Yes. FRAX can estimate risk without a bone-density measurement.
A clinician may use this initial estimate to help decide whether DXA testing would be useful. Adding an appropriate measurement can refine the assessment.
When bone density is entered, standard FRAX uses the femoral neck, a specific part of the hip.
Do not substitute a spine measurement, total-hip result, heel screening score, or whichever number looks lowest on your report.
Our bone-density testing guide explains the different measurements.
How Is FRAX Different From a T-Score?
A T-score describes bone density relative to a young-adult reference population. FRAX estimates fracture probability using several pieces of information.
Two people with the same T-score can have different fracture risks because their ages and medical histories differ.
This is particularly relevant in osteopenia. Some people with osteopenia have sufficiently high fracture risk to warrant medication, while others may be managed with lifestyle measures and monitoring.
Read our osteopenia vs osteoporosis guide for that distinction.
What FRAX Score May Lead to Treatment?
There is no single treatment threshold used worldwide.
In the United States, BHOF guidance commonly supports considering medication for postmenopausal women and men aged 50 or older who have osteopenia at the hip and either:
- A ten-year hip fracture probability of 3% or higher, or
- A ten-year major osteoporotic fracture probability of 20% or higher.
These are US thresholds, not universal rules.
Other countries use different approaches. For example, UK NOGG guidance uses age-dependent thresholds over part of the age range.
Your clinician should apply the relevant local guidance and consider your preferences and medical circumstances.
Treatment can be appropriate without crossing a FRAX threshold
An established osteoporosis diagnosis or a qualifying fragility fracture may already justify treatment.
A low-looking FRAX result should not be used to dismiss a previous hip or vertebral fracture or override a full assessment.
Our osteoporosis treatment guide explains the broader decision.
Comparing commercial programs? Review the program information here. Be cautious of claims that a calculator result proves you can safely replace prescribed treatment.
What Can Standard FRAX Miss?
FRAX simplifies a complex clinical picture. Some factors are entered as yes-or-no answers even though their severity matters.
Important limitations include:
| Factor | Why further interpretation may be needed |
|---|---|
| Recent or multiple fractures | A single “previous fracture” entry does not fully describe timing or number |
| Steroid dose | The standard entry does not capture every dose and exposure pattern |
| Falls | Standard FRAX does not directly include fall frequency |
| Much lower spine density than hip density | A femoral-neck calculation may not fully reflect the discrepancy |
| Type 2 diabetes | Risk may be underestimated in some people |
Clinicians may use additional assessment or validated adjustments where appropriate. Some adjustments are available through FRAXplus.
Do not manually increase or decrease your percentage based on a guess. Explain the missing information to your clinician.
For readers taking glucocorticoids, our steroids and osteoporosis guide explains why dose and duration matter.
Does a Ten-Year Estimate Mean There Is No Immediate Risk?
No. A ten-year estimate does not tell you precisely when a fracture might occur.
A recent fragility fracture can signal increased near-term risk that needs prompt attention. Do not wait for the next routine calculation if you develop a new fracture or a substantial change in health.
Similarly, do not simply divide the ten-year percentage by ten to obtain a dependable annual risk.
Can You Use FRAX to Check Whether Treatment Is Working?
FRAX is not a treatment-response calculator.
Changes in the percentage can reflect aging or changes in the information entered. A falling score does not prove that a particular medicine, diet, or program caused an improvement.
Clinicians assess treatment using information such as fractures, adherence, appropriate repeat bone-density measurements, and the broader clinical picture.
FRAX may have a role in reassessing risk in selected treated patients, but that is different from using it to measure treatment success yourself.
How to Prepare for a FRAX Discussion
Bring your DXA report, medicine list, and details of previous fractures.
Ask:
- Was the appropriate country model used?
- Was femoral-neck bone density included?
- Have all relevant fractures and steroid treatments been considered?
- Are there important factors the standard calculation misses?
- Which treatment guideline applies to me?
- What would change our current plan?
Tell your clinician about falls even if the calculator does not ask about them.
Our home fall-prevention guide offers practical steps that complement medical care.
What Should You Do With Your Result?
Use the result to support a clear conversation about fracture prevention.
Depending on your circumstances, next steps may include further testing, medication, suitable exercise, nutrition review, and fall prevention.
You do not need to repeatedly calculate your score or compare it with someone else’s. The useful outcome is a care plan that fits your risk and explains when to reassess.
Before purchasing additional guidance: You can review this commercial osteoporosis program. Assess its evidence separately; a FRAX estimate does not validate a seller’s claims.
References and Further Reading
- Official FRAX Calculator
- FRAX Frequently Asked Questions
- BHOF: Fracture Risk Assessment
- BHOF: Osteoporosis Treatment
- NOGG: Fracture Risk Assessment
- NOGG: Intervention Thresholds and Strategy
Medical disclaimer: This article provides general education and does not replace individualized risk assessment, diagnosis, or treatment.
Affiliate notice: Commercial links do not establish that a program reduces fracture risk.