Z-score DEXA
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
Z-score
About this calculator
The Z-score DEXA calculator is a useful tool for doctors and patients who need to compare bone age with chronological age. It uses the Z-score formula, which is a statistical measure that indicates the number of standard deviations of an observation from the mean. This calculation is crucial for evaluating the bone health of patients with diseases such as osteoporosis.
The Z-score is calculated by subtracting the bone age from the chronological age and dividing by the standard deviation of bone age at that age. This provides an objective measure of bone loss. In orthopedic cases, comparing bone age with chronological age is especially important for evaluating the risk of fractures and other bone health-related problems.
It is essential to note that the Z-score DEXA should be interpreted carefully, as the result may be influenced by several factors, including the patient's previous bone density, age, and sex. Moreover, it is vital to consider the appropriate bone health care and recommendations for each individual, especially in cases of diseases such as osteoporosis.
Here is an example of a real-life case: a 60-year-old patient was diagnosed with osteoporosis. His bone age was measured by DEXA, and the result was -2.5. This means that his Z-score is -2.5, indicating a significant loss of bone mass relative to his chronological age.
Frequently asked questions
What is the Z-score DEXA and what is it for?
The Z-score DEXA is a statistical measure that compares bone age with chronological age, providing an objective evaluation of bone health. It is especially useful in cases of osteoporosis and orthopedics.
How is the Z-score DEXA calculated?
The Z-score DEXA is calculated by subtracting bone age from chronological age and dividing by the standard deviation of bone age at that age.
What are the bone health care and recommendations that I should follow after using the Z-score DEXA calculator?
It is essential to consider the appropriate bone health care and recommendations for each individual, especially in cases of diseases such as osteoporosis. Consult a doctor to get personalized guidance.
What does a negative Z-score mean?
A negative Z-score indicates a significant loss of bone mass relative to chronological age. This may be a sign of diseases such as osteoporosis.
Can I use the Z-score DEXA calculator to diagnose osteoporosis?
No, the Z-score DEXA calculator is not a substitute for a medical diagnosis. Consult a doctor to get an accurate diagnosis and personalized guidance.