How to Use the FRAX Questionnaire to Assess Osteoporosis Risk
Osteoporosis quietly increases fracture risk as people age, but estimating that risk can be confusing for patients and clinicians alike. The FRAX questionnaire — short for Fracture Risk Assessment Tool — is widely used to estimate a person’s 10-year probability of a major osteoporotic fracture and hip fracture. It combines age, sex, clinical risk factors and, optionally, femoral neck bone mineral density (BMD). Understanding how to complete and interpret the FRAX questionnaire helps prioritize who needs a bone density scan, lifestyle intervention, or medication review. This article explains what the FRAX tool measures, how to complete the questionnaire step by step, how to interpret results in the context of guidelines, and key limitations to keep in mind so the score is used safely and effectively.
What does the FRAX questionnaire measure and why it matters?
The FRAX calculator produces two 10-year probabilities: one for hip fracture and one for major osteoporotic fracture (hip, clinical spine, forearm, and humerus). It uses simple inputs — age, sex, weight, height (for BMI), prior fracture, parental hip fracture, current smoking, long-term oral glucocorticoid use, rheumatoid arthritis, secondary causes of osteoporosis, and alcohol intake of three or more units per day — plus optionally femoral neck BMD. Many national FRAX models are calibrated to country-specific fracture and mortality rates, which makes the output more relevant for local populations. Clinicians use FRAX to guide decisions about further testing (such as DXA scanning) and to estimate whether a patient meets treatment thresholds according to local osteoporosis guidelines.
How to complete the FRAX questionnaire step by step
Begin by collecting accurate measurements and clinical history: date of birth (or age), sex, current weight and height to calculate BMI, and a history of prior fragility fractures. Ask about parental hip fracture, smoking status, prolonged steroid treatment (typically equivalent to prednisolone ≥5 mg daily for three months or more), and conditions associated with secondary osteoporosis (for example, type 1 diabetes, untreated long-standing hyperthyroidism, or malabsorption syndromes). Record whether alcohol consumption averages three or more units per day and whether the patient has rheumatoid arthritis. If you have a recent femoral neck BMD (T-score or g/cm2), include it to refine the estimate. Accurate inputs reduce the margin for error in the FRAX output.
Interpreting FRAX output: 10-year probabilities and common thresholds
The FRAX result is expressed as percentages for hip fracture and major osteoporotic fracture over 10 years. There is no universal “magic number” for treatment; thresholds vary by guideline and country. For example, some clinical guidelines use a 10-year hip fracture probability of 3% or a major osteoporotic fracture probability of 20% as action points to consider pharmacologic therapy in older adults, while other health systems set different cutoffs or use age-adjusted criteria. Use FRAX as one piece of the clinical assessment: compare the calculated probabilities with your local osteoporosis screening guidelines and discuss options that may include DXA scanning, lifestyle interventions, and, when appropriate, medication.
Key FRAX questionnaire items and what they mean
| FRAX Input | How it is recorded | Clinical significance |
|---|---|---|
| Age, sex, BMI | Numeric values from patient | Primary drivers of baseline fracture risk |
| Prior fracture | Yes/No (fragility fracture after age 50) | Strong predictor of future fractures |
| Parental hip fracture | Yes/No | Reflects family history and genetic predisposition |
| Glucocorticoid use | Yes/No (chronic oral steroids) | Increases bone loss and fracture risk |
| Optional femoral neck BMD | Enter T-score or g/cm² | Improves accuracy of the 10-year risk estimate |
Limitations and important caveats when using FRAX
The FRAX questionnaire gives an estimate, not a definitive diagnosis. It does not account for some important risk modifiers such as history or frequency of falls, the dose and duration of glucocorticoid exposure, detailed secondary conditions, frailty, or vertebral fractures not previously identified. Ethnic and regional differences matter; use the country-specific model when available. FRAX is validated for adults over 40 and performs best in untreated populations; results should be interpreted alongside clinical judgment, recent DXA results, and patient preferences. Overreliance on a single percentage without clinical context can lead to under- or overtreatment.
How clinicians use FRAX to guide decisions
Clinicians typically use FRAX to triage patients: a low 10-year probability may support conservative measures (exercise, fall prevention, calcium and vitamin D review), while a higher risk prompts DXA testing and a discussion about pharmacologic therapy. Many specialists combine FRAX with other data — vertebral imaging, trabecular bone score where available, and biochemical testing — before recommending long-term medication. Shared decision-making is critical: discuss the magnitude of risk, potential benefits and side effects of treatments, and non-pharmacologic strategies such as strength training, smoking cessation, and limiting high alcohol intake.
Next steps after a FRAX assessment
After completing the FRAX questionnaire, review the numbers in the context of the patient’s age, comorbidities and local treatment thresholds. If risk is uncertain or near a decision threshold, a DXA scan of the hip and spine can provide more precise data and is the usual next step. Regardless of the score, emphasize evidence-based lifestyle changes and ensure adequate calcium and vitamin D intake per local recommendations. Always document the FRAX inputs and discuss results with the patient so they understand the rationale for any follow-up testing or treatment plan.
Disclaimer: This article provides general information about fracture risk assessment and does not replace professional medical evaluation. For personalized advice about osteoporosis screening and treatment, consult a qualified healthcare provider who can interpret FRAX results alongside clinical examination, DXA testing, and local guideline recommendations.
This text was generated using a large language model, and select text has been reviewed and moderated for purposes such as readability.
