AI Summary ARFI elastography is a painless ultrasound scan that estimates liver stiffness to check for scarring (fibrosis). Doctors order it for chronic liver disease, often after a blood score such as FIB-4. A technician moves a probe over your upper abdomen, with no needle or radiation. Higher stiffness suggests more fibrosis, though food, alcohol, and body size can affect readings. It cannot diagnose a disease alone, so your care team reads it with other results.
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ARFI elastography is an ultrasound-based test that estimates how stiff your liver is. Stiffness matters because scar tissue, called fibrosis, makes the liver firmer.
The scan tracks how fast a shear wave, a tiny ripple, moves through liver tissue. A faster wave points to a stiffer liver.
The test is painless and needs no biopsy needle. It cannot diagnose a disease by itself. Your care team reads it with blood tests, your health history, and other imaging.
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Ultrasound Liver Stiffness Test
ARFI elastography is a noninvasive, ultrasound-based test that estimates liver stiffness. Doctors use stiffness as a stand-in for fibrosis, the scar tissue that builds up after long-term liver injury.
Imaging methods that measure stiffness can estimate fibrosis severity. They include transient elastography, shear wave elastography (SWE), and magnetic resonance elastography (MRE).
The measurement is called liver stiffness measurement (LSM). It reflects how fast a shear wave moves through liver tissue. Higher stiffness points to more fibrosis.
Noninvasive tests avoid the pain, bleeding risk, and sampling variability of a liver biopsy, and doctors can repeat them over time. ARFI is a different test from FibroScan. It is also different from a standard liver ultrasound, which shows the structure of the liver but does not measure how stiff it is.
Reasons for Fibrosis Testing
Doctors use elastography to look for fibrosis in people with chronic liver disease, such as [hepatitis C](/liver-diseases/viral-hepatitis/hepatitis-c), hepatitis B, or fatty liver disease. Finding scarring early gives you and your care team time to act.
Doctors often use a staged approach. A simple blood score such as [FIB-4](/liver-tests/medical-scores/fibrosis-scores/fib-3-fib-4) comes first. If the result is unclear or raises concern, an elastography scan can confirm it.
Stiffness scans help some people avoid or delay a liver biopsy. Because the test is noninvasive, your doctor can repeat it over time to see whether stiffness changes.
Very high stiffness can signal cirrhosis, which is advanced scarring. Doctors also read stiffness together with your platelet count to judge whether clinically significant portal hypertension, raised pressure in the liver's blood vessels, is likely.
Scan Preparation and Process
Exact steps vary by clinic and machine. This is the general pattern for an ultrasound-based scan.
Understanding Stiffness Numbers
These reference points apply to transient elastography (TE) and shear wave elastography (SWE), reported in kilopascals (kPa). Your ARFI report may use different units or cutoffs, so rely on the ranges printed on your own report.
| Liver stiffness (TE or SWE) | What it generally suggests |
|---|---|
| Below 5 kPa | Generally rules out significant fibrosis when the chance of liver disease is low |
| 8 to 11 kPa | Suggests significant fibrosis |
| 12 kPa or higher | Compatible with advanced fibrosis |
| 15 kPa or higher | Suggests cirrhosis, with high specificity |
Exact cutoffs vary by cause of liver disease and should be read in clinical context. Only your care team can tell you what your number means.
Accuracy Factors and Limits
Stiffness can read falsely high during an alanine aminotransferase (ALT) flare, which signals active liver inflammation. Blocked bile flow outside the liver (extra-hepatic cholestasis) and congestive heart failure can also raise it.
Recent food intake and heavy alcohol use can push stiffness readings up. Follow your clinic's preparation instructions, and tell the team about your alcohol use.
Extra body fat makes ultrasound harder to read. Elastography can give unreliable results in people with a high body mass index (BMI), in up to 20% of some studies of transient elastography. Ask your clinic how ARFI performs in your situation.
Fibrosis Test Comparison
[FibroScan](/liver-tests/imaging-non-invasive-testing/elastography-fibrosis-testing/fibroscan) uses transient elastography and also estimates liver fat. [Shear Wave Elastography (SWE)](/liver-tests/imaging-non-invasive-testing/elastography-fibrosis-testing/shear-wave-elastography) and [Velacur](/liver-tests/imaging-non-invasive-testing/elastography-fibrosis-testing/velacur) are other ultrasound-based ways to measure stiffness.
[MR Elastography (MRE)](/liver-tests/imaging-non-invasive-testing/cross-sectional-imaging/mr-elastography) measures stiffness with magnetic resonance imaging instead of ultrasound. MRE uses different stiffness cutoffs, so numbers from the two tests are not interchangeable.
A liver biopsy takes a tissue sample and remains the most precise way to stage fibrosis. It carries risks of pain and bleeding, which is why doctors try noninvasive tests first when they can.
Follow-Up and Care Planning
Your result is one piece of the picture. What happens next depends on the number, your blood tests, and your health history.
A low result may mean your doctor can rule out significant fibrosis and simply keep watching your liver.
An in-between result may lead to more testing, such as another imaging test or blood-based scores.
A high result may lead to a visit with a liver specialist. For portal hypertension, a stiffness below 15 kPa with a platelet count of 150,000 per microliter or higher generally rules it out. A stiffness of 25 kPa or higher makes it very likely.
Bring your report to your appointment and ask what the result means for your cause of liver disease. If you do not yet have a liver specialist, use the search below.
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Common Questions
No. ARFI elastography estimates how stiff your liver is, and stiffness points to scarring (fibrosis). It does not name the cause of the scarring or diagnose a specific disease. That is why your care team reads the result with your blood tests, your health history, and other imaging. A high number is a reason for follow-up, not a diagnosis. Abnormal results do not always mean severe disease, and your doctor may repeat the test or order more tests to get a clearer picture.
No. The scan is painless. You lie on an exam table, usually face-up, with the right side of your upper abdomen exposed. A technician spreads a water-based gel on your skin and moves a handheld probe over the area. The test uses no needle and no radiation. You may be asked to change position or hold your breath briefly so the probe gets a clear reading. It is usually done at a hospital or imaging center, and you go home the same day.
Not always. Stiffness scans can help some people avoid or delay a biopsy, and because the scan is noninvasive, your doctor can repeat it over time to see whether stiffness changes. A liver biopsy takes a tissue sample and remains the most precise way to stage fibrosis. It also carries risks of pain and bleeding. Your doctor may still suggest a biopsy if the scan result is unclear or does not fit the rest of your results.
Several things can make stiffness read falsely high. These include a flare of alanine aminotransferase (ALT), which signals active liver inflammation, blocked bile flow outside the liver, and congestive heart failure. Recent food and heavy alcohol use can also raise the number. Follow your clinic's preparation steps, such as when to stop eating and drinking before the scan. Tell the team about your alcohol use and any heart or liver conditions. If your result seems out of line with your other tests, ask whether the scan should be repeated.
No. Both are ultrasound-based tests that estimate liver stiffness, but they use different machines and methods. FibroScan uses transient elastography and also estimates liver fat. Because the methods differ, stiffness numbers and cutoffs from the two tests are not interchangeable. The reference points on this page apply to transient and shear wave elastography, so rely on the ranges printed on your own ARFI report. Ask your care team which cutoffs apply to you.
Medical disclaimer: LiverDirectory provides educational information and a directory of providers. It does not provide medical advice, diagnosis, or treatment. Always consult a licensed physician regarding any medical condition.
