Patient guide · Reviewed May 2026
FibroScan Limitations — What Patients Need to Know
FibroScan is the most widely used liver elastography device in Australia and a significant advance over liver biopsy for routine non-invasive liver assessment. However, it has well-documented limitations that every patient should understand — particularly if their result was flagged as unreliable or if they have a higher BMI.
This guide covers the known limitations of FibroScan, when results should be interpreted cautiously, and what alternatives are available.
Published 2026-05-31 · Clinically reviewed 2026-05-31
Patient guide · Reviewed May 2026
Limitation 1 — Obesity and Higher BMI
FibroScan's standard M probe is designed for patients with a normal to moderately elevated BMI. In patients with significant obesity — particularly a…
FibroScan's standard M probe is designed for patients with a normal to moderately elevated BMI. In patients with significant obesity — particularly a skin-to-liver-capsule distance greater than 25mm — the standard M probe cannot adequately reach the liver parenchyma, producing unreliable or failed measurements.
Echosens addressed this with the XL probe — a wider-frequency probe designed for obese patients. However, not all Australian FibroScan operators have the XL probe, and even with the XL probe, accuracy is reduced compared to normal-weight patients.
The practical implication: if your FibroScan result came back as "unreliable" or showed an IQR/median ratio above 30%, a high BMI may be the cause. In this situation, ask about:
- Repeat scanning with an XL probe (if your clinic has one)
- Guided elastography devices with a universal probe designed to handle higher BMI without probe switching (such as the iLivTouch, which uses a single wideband probe for all patient types)
- MRI-based elastography at a specialist centre
Limitation 2 — Liver Inflammation (Active Hepatitis)
Liver stiffness is not exclusively caused by fibrosis. Active liver inflammation — from any cause including acute viral hepatitis, alcohol-related liver injury, or drug-induced liver injury — temporarily increases liver stiffness independent of fibrosis stage.
This means FibroScan can overestimate fibrosis stage in patients with significant active inflammation. A patient with F1 fibrosis but severe active hepatitis may produce a kPa reading consistent with F3 — not because they have F3 fibrosis, but because the inflammation is stiffening the liver independently.
For this reason, liver function tests (particularly ALT) should always be reviewed alongside FibroScan results. Significant ALT elevation at the time of scanning — generally above 5 times the upper limit of normal — reduces the reliability of the stiffness result for fibrosis staging purposes. A specialist will always interpret FibroScan results in the context of concurrent liver function tests.
Patient guide · Reviewed May 2026
Limitation 3 — Fasting State
FibroScan results can be artificially elevated if the scan is performed within 2 hours of a meal. Post-meal portal venous blood flow increases, temporarily…
FibroScan results can be artificially elevated if the scan is performed within 2 hours of a meal. Post-meal portal venous blood flow increases, temporarily increasing liver stiffness.
Most Australian FibroScan clinics ask patients to fast for 2–4 hours before scanning. If you did not fast before your scan, the result may be less reliable — particularly if the kPa reading is borderline between fibrosis stages.
Limitation 4 — Operator Experience
Transient elastography result quality is operator-dependent. The IQR/median ratio on your result report indicates measurement consistency — but a low IQR/median ratio can be achieved by an experienced operator even in difficult anatomical situations. An inexperienced operator may produce a low IQR ratio that appears reliable but actually reflects poor probe positioning.
In Australia, FibroScan operators are typically trained by Echosens or by experienced clinicians, but training standards and ongoing competency assessment vary between clinics. High-volume specialist liver clinics will generally have more experienced operators than low-volume general imaging centres.
If you are concerned about operator experience, look for clinics that perform high volumes of liver elastography as part of a dedicated hepatology or gastroenterology service.
Patient guide · Reviewed May 2026
Limitation 5 — Cannot Diagnose MASH
FibroScan measures liver stiffness (fibrosis proxy) and liver fat content (CAP score). It cannot directly detect MASH — the inflammatory form of fatty liver…
FibroScan measures liver stiffness (fibrosis proxy) and liver fat content (CAP score). It cannot directly detect MASH — the inflammatory form of fatty liver disease — because inflammation does not produce a distinct elastography signal that differentiates it from fibrosis alone.
Diagnosing MASH definitively still requires liver biopsy. For most clinical purposes, however, the combination of FibroScan result, liver function tests, and clinical context provides sufficient information to guide management without biopsy.
Limitation 6 — IQR/Median Ratio and Reliability
A reliable FibroScan result requires an IQR/median ratio below 30%. Results with a ratio above 30% should be interpreted with caution and may need to be repeated.
Common causes of a high IQR/median ratio:
- Patient movement or breathing during the scan
- Incorrect probe placement
- Very small intercostal window (narrow space between ribs)
- High BMI limiting probe-liver contact
- Severe liver inflammation
If your report shows an IQR/median above 30%, discuss with your GP whether a repeat scan or alternative assessment is warranted.
Patient guide · Reviewed May 2026
When FibroScan Results May Need Verification
Consider seeking a second opinion or alternative assessment if:
Consider seeking a second opinion or alternative assessment if:
- Your IQR/median ratio was above 30%
- You have a BMI above 35 and an XL probe was not used
- Your ALT was significantly elevated at the time of scanning
- Your result appears inconsistent with your clinical picture or symptoms
- You did not fast before the scan
Alternatives to FibroScan
Several non-invasive alternatives to FibroScan are available in Australia:
Guided elastography (e.g. iLivTouch): Uses real-time ultrasound imaging to guide probe placement before taking measurements — reducing operator variability and improving accuracy in difficult patients including those with higher BMI. Uses a single universal probe rather than requiring M/XL probe switching.
2D Shear Wave Elastography (2D-SWE): Available on some high-end ultrasound machines. Measures liver stiffness using a different mechanical wave approach. Accurate and available at specialist centres.
MRI elastography: The most accurate non-invasive liver stiffness assessment available. Requires MRI access and is significantly more expensive. Reserved for complex cases where other modalities are inconclusive.
Liver biopsy: Still the diagnostic gold standard for definitive fibrosis staging and MASH diagnosis. Reserved for cases where non-invasive tests are inconclusive and management decisions require certainty.
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Frequently asked questions
Why did my FibroScan come back as unreliable?
An unreliable result (IQR/median above 30%) most commonly occurs due to high BMI, scanning without fasting, patient movement, or limited intercostal window. Ask your clinic whether a repeat scan with appropriate preparation or a different probe/device would give a more reliable result.
Is FibroScan accurate for overweight patients?
Accuracy decreases with increasing BMI. The XL probe improves performance in obese patients compared to the standard M probe, but accuracy remains lower than in normal-weight patients. Guided elastography devices with universal probes may offer improved performance in higher-BMI patients.
Can FibroScan miss fibrosis?
FibroScan has high sensitivity for significant fibrosis (F2 and above) but may miss minimal fibrosis (F1) in some patients. A normal FibroScan result is reassuring but does not entirely exclude early fibrosis if clinical risk factors are high.
How does guided elastography differ from FibroScan?
Traditional FibroScan is performed blind — the operator positions the probe without real-time imaging guidance. Guided elastography systems add real-time ultrasound imaging so the operator can see exactly where measurements are being taken, avoiding vessels and confirming correct positioning. This can improve reproducibility, particularly in complex patients.
This article is for educational purposes only. It does not constitute medical advice. Always consult your GP or a specialist about your individual health circumstances.
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