ARFI reference values:
- 1.35 - absent or mild fibrosis (F0 or F1)
- 1.35-1.55 - significant fibrosis (F2)
- 1.55- 1.80 - severe fibrosis (F3)
- >1.80 - cirrhosis (F4)
Based on meta-analysis of pooled data which included a predominance of HCV patients - Friedrich-Rust et al J Viral hepatitis 2012, 19 e212-1219.
These threshold values are not absolute and results should be interpreted in clinical context. Such things as inflammatory activity and venous congestion can elevate the ARFI value.