Liver stiffness is a measure of how "dense" the liver tissue has become. The more scars it contains (fibrosis), the higher the stiffness. It is measured non-invasively with elastography (for example, FibroScan) in kilopascals (kPa).
This is a way to assess fibrosis without a biopsy: low stiffness almost rules out marked fibrosis, while high stiffness points to cirrhosis and a risk of complications.
How it is measured
The most common method is vibration-controlled transient elastography (FibroScan). There are also ultrasound-based elastography methods (pSWE, 2D-SWE) and the most accurate MR elastography. The result is expressed in kPa; the same device also estimates the amount of fat via the CAP parameter.
What the values mean
For metabolic fatty liver disease the rough guide is: below 8 kPa marked fibrosis is unlikely, 8–12 kPa is a "gray zone", above 12 kPa marked fibrosis or cirrhosis is likely. Under the Baveno VII approach, a stiffness of 25 kPa and above indicates a high risk of clinically significant portal hypertension.
The exact thresholds depend on the cause of the liver disease, so the result is always interpreted together with indices (for example, FIB-4) and the clinical picture.
What affects the result
Stiffness can be overestimated with active inflammation and high ALT (cytolysis), cholestasis, venous congestion in heart failure, and right after eating. Obesity and ascites make measurement difficult. That is why the test is done fasting and interpreted taking these factors into account.
Reference ranges
An approximate interpretation of liver stiffness (FibroScan/VCTE); the thresholds depend on the cause of the disease.
| < 8 kPa | marked fibrosis unlikely |
| 8–12 kPa | indeterminate, further work-up needed |
| > 12–15 kPa | marked fibrosis likely (F3–F4) |
| ≥ 25 kPa | high risk of clinically significant portal hypertension (Baveno VII) |
Calculate using this marker
Calculators where Liver stiffness is used directly:
Frequently asked questions
Is liver stiffness the same as fibrosis?
It is an indirect measure of fibrosis: usually the higher the stiffness, the more scarring. But it can be inflated by inflammation, cholestasis and venous congestion, so the result is assessed in context.
Is a biopsy needed if you have a FibroScan?
Often not. In typical cases elastography together with calculated indices (FIB-4) replaces a biopsy; it is reserved for uncertain situations.
Related terms
Sources
- StatPearls (NCBI) — Metabolic Dysfunction-Associated Steatotic Liver Disease (MASLD)
- RadioGraphics (RSNA) — Nomenclature, Diagnosis and Management of MASLD
- EASL–EASD–EASO Clinical Practice Guidelines on MASLD