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Calculate Frax Score Usa

Reviewed by Calculator Editorial Team

The FRAX score is a tool used to estimate the 10-year probability of a major osteoporotic fracture in women and men aged 20 years and over. Developed by the World Health Organization (WHO), the FRAX tool provides a standardized method for assessing fracture risk based on clinical and demographic factors.

What is the FRAX score?

The FRAX score is a validated risk assessment tool that calculates the 10-year probability of a major osteoporotic fracture. It was developed by the WHO Collaborating Centre for Metabolic Bone Diseases and is widely used in clinical practice and research.

FRAX uses a combination of clinical and demographic factors to estimate fracture risk. These include:

  • Age
  • Sex
  • Body mass index (BMI)
  • Previous fracture history
  • Parental history of hip fracture
  • Menopausal status (for women)
  • Glucocorticoid use
  • Ethnicity
  • Smoking status
  • Alcohol intake

The FRAX score is expressed as a percentage, representing the estimated probability of a major osteoporotic fracture occurring within the next 10 years.

How to use this calculator

To calculate your FRAX score, follow these steps:

  1. Enter your age in years
  2. Select your sex (male or female)
  3. Enter your body mass index (BMI)
  4. Indicate if you have had a previous fracture (yes or no)
  5. Indicate if you have a parental history of hip fracture (yes or no)
  6. For women: enter your age at menopause (if applicable)
  7. Indicate if you use glucocorticoids (yes or no)
  8. Select your ethnicity
  9. Indicate your smoking status
  10. Enter your alcohol intake in standard drinks per week

Click the "Calculate" button to generate your FRAX score. The calculator will display your estimated 10-year fracture risk percentage.

Note: This calculator uses the WHO FRAX tool with US-specific parameters. The results are estimates and should be interpreted in conjunction with clinical judgment.

Interpreting your FRAX score

The FRAX score provides an estimate of your 10-year probability of a major osteoporotic fracture. The interpretation of your score depends on your age and sex:

Women

  • Low risk: 1.3% or less
  • Moderate risk: 1.4% to 3.0%
  • High risk: 3.1% to 6.1%
  • Very high risk: 6.2% or more

Men

  • Low risk: 2.2% or less
  • Moderate risk: 2.3% to 4.2%
  • High risk: 4.3% to 7.2%
  • Very high risk: 7.3% or more

A higher FRAX score indicates a greater probability of a major osteoporotic fracture occurring within the next 10 years. The FRAX tool can help guide clinical decision-making regarding osteoporosis prevention and treatment.

Limitations of the FRAX tool

While the FRAX tool is a valuable risk assessment instrument, it has several limitations:

  • FRAX estimates fracture risk over a 10-year period, which may not be directly applicable to shorter or longer timeframes
  • The tool does not account for all potential risk factors, including certain medications, vitamin D levels, and other medical conditions
  • FRAX scores are population-based estimates and may not be as accurate for individual patients
  • The tool does not predict the type or location of fractures that may occur

It's important to use the FRAX score in conjunction with clinical judgment and other risk assessment tools when making decisions about osteoporosis prevention and treatment.

FAQ

What is the difference between FRAX and other fracture risk assessment tools?
FRAX is a standardized, internationally validated tool developed by the WHO. Other fracture risk assessment tools may have different methodologies and may not be as widely accepted or validated.
How accurate is the FRAX score?
The FRAX score provides a reasonable estimate of fracture risk based on clinical and demographic factors. However, it should be interpreted in conjunction with clinical judgment and other risk assessment tools.
Can the FRAX score predict the type or location of fractures?
No, the FRAX score estimates the probability of a major osteoporotic fracture but does not predict the specific type or location of fractures that may occur.
How often should I recalculate my FRAX score?
The frequency of FRAX score recalculation depends on individual circumstances. Generally, it's recommended to reassess fracture risk when there are significant changes in clinical factors or when initiating osteoporosis prevention or treatment.