FIB-4 (fibrose hepática)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
FIB-4
About this calculator
The FIB-4 calculator is an online tool that helps evaluate the risk of liver fibrosis in patients with hepatitis C. It uses a simple but effective mathematical formula to calculate the FIB-4 index, which indicates the probability of developing liver fibrosis.
The formula used by the calculator is (age · AST) / (platelet count · √ALT). FIB-4 results are classified into different categories, allowing healthcare professionals to identify patients with a high risk of liver fibrosis.
It is essential to remember that the FIB-4 calculator is not an automatic diagnosis, but rather a tool that can help doctors make informed decisions. Additionally, it is crucial to perform imaging tests and other evaluations to confirm the diagnosis of liver fibrosis.
Common precautions when using the calculator include ensuring that AST, ALT, and platelet count values are up-to-date and accurate, as well as considering the presence of other medical conditions that may affect FIB-4 results.
Frequently asked questions
What is the FIB-4?
The FIB-4 is an index that indicates the probability of developing liver fibrosis in patients with hepatitis C.
When should I use the FIB-4 calculator?
The FIB-4 calculator should be used by healthcare professionals to evaluate the risk of liver fibrosis in patients with hepatitis C.
How do I interpret the FIB-4 results?
FIB-4 results are classified into different categories, indicating the probability of liver fibrosis, from low to high.
What is important to remember when using the FIB-4 calculator?
It is essential to ensure that AST, ALT, and platelet count values are up-to-date and accurate, as well as considering the presence of other medical conditions that may affect FIB-4 results.
Can I rely on the FIB-4 calculator results?
Yes, the FIB-4 calculator is a reliable tool, but it is essential to remember that it is not an automatic diagnosis and that other tests and evaluations should be performed to confirm the diagnosis of liver fibrosis.