Fibrosis-4 (FIB-4)
Optimal Result:
0 - 1.33 Score.
Fibrosis-4 (FIB-4) is a clinical marker used to evaluate the degree of liver fibrosis, particularly in patients with chronic liver diseases like hepatitis C and non-alcoholic fatty liver disease (NAFLD). It is a non-invasive test that helps doctors assess the extent of liver damage without the need for a liver biopsy, which is more invasive and can be risky.
The FIB-4 index is calculated using a simple formula that includes the patient's age, levels of two liver enzymes (AST and ALT), and platelet count.
Specifically, the formula is:
FIB-4 Score = (Age* x AST) / (Platelets x √(ALT))
*Use with caution in patients <35 or >65 years old, as the score has been shown to be less reliable in these patients.
A higher FIB-4 score indicates a greater likelihood of significant liver fibrosis, while a lower score suggests minimal or no fibrosis. This test is particularly useful because it is derived from routine blood tests, making it accessible and cost-effective for monitoring liver health. Clinicians use the FIB-4 score to make decisions about the need for further testing, like imaging studies or liver biopsy, and to guide treatment plans for liver disease. Overall, the FIB-4 index is a valuable tool in the management of liver disease, helping to identify patients at risk for advanced liver fibrosis who might benefit from more aggressive treatment and monitoring.
When to use Fibrosis-4 (FIB-4):
- Patients with any known risk factors for liver disease, including chronic hepatitis, alcoholic liver disease, non-alcoholic fatty liver disease (NAFLD) and the cholestatic and metabolic liver diseases.
- Patients with known liver fibrosis should have their fibrosis trended over time to evaluate for progression or stabilization.
Other notes:
- Liver fibrosis often progresses non-linearly, so it is important to be able to re-assess fibrosis trends in individual patients over time, and invasive re-assessments carry significant risk to patients. FIB-4 allows for non-invasive liver fibrosis assessment.
- FIB-4 was developed in patients with HIV and HCV co-infection.
- FIB-4 was developed to correlate with Ishak levels of fibrosis (by biopsy) with 3 levels: 0-2 (mild fibrosis), 3-4 (moderate fibrosis), 5-6 (severe fibrosis/cirrhosis)
Why use Fibrosis-4 (FIB-4):
- While liver biopsy is the gold standard for the diagnosis of liver fibrosis, it is not ideal; biopsy only evaluates a minute portion of the liver itself, so sampling errors can occur. Liver biopsy also comes with substantial morbidity.
- Liver fibrosis often progresses non-linearly, so it is important to be able to re-assess fibrosis trends in individual patients over time.
- It is critical that tests to identify liver cirrhosis are highly sensitive, as patients with the disease require screening for hepatocellular carcinoma (HCC) and gastroesophageal varices.
- The FIB-4 Index was shown to be superior to 7 other noninvasive markers of fibrosis in patients with NAFLD, including the NAFLD Fibrosis Score (Shah 2009).
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