The FibroScan CAP score is the number on your report that tells you how much fat has accumulated in your liver. Most people focus on the kPa — the liver stiffness figure — and barely register the controlled attenuation parameter sitting beside it. That’s a mistake. The CAP score is what catches hepatic steatosis at the stage where the most can still be done about it. And unlike liver stiffness, it moves fast — in both directions — making it the more immediately actionable of the two numbers for most fatty liver patients.
Here’s what it actually measures, what the ranges mean, and what moves it.
What Is a FibroScan CAP Score and What Does It Measure?
The controlled attenuation parameter is a measurement built into the FibroScan device that quantifies liver fat non-invasively, in the same session that produces your liver stiffness kPa reading.
The physics behind it: ultrasound signals lose energy — attenuate — as they pass through tissue. Fat cells absorb ultrasound energy more readily than healthy liver cells. The more fat present in liver tissue, the more the signal is dampened before it returns to the probe. The FibroScan CAP score quantifies this attenuation and translates it into a dB/m value that maps to a steatosis grade.
What this means practically: without cutting anything open, without a biopsy, without contrast dye — a 10–15 minute FibroScan session tells you what percentage of your liver cells are estimated to contain fat droplets. That estimate is the CAP score.
Two things worth understanding about what it does and doesn’t tell you:
It measures current fat content. The liver’s fat accumulation responds to metabolic conditions — diet, blood sugar, exercise, body weight. The FibroScan CAP score reflects where things stand right now, not where they’ve been for years. This is why it can improve meaningfully between scans when the underlying metabolic drivers are properly addressed.
It measures fat content only — not damage. A high CAP score tells you fat is present. It doesn’t tell you whether that fat has triggered inflammation or scarring. That’s what the liver stiffness kPa reading is for. Reading either number without the other gives an incomplete picture of what’s actually happening.
CAP Score Ranges — The Full Steatosis Grading Scale
The FibroScan CAP score maps to a four-grade hepatic steatosis classification. The grades reflect what proportion of liver cells contain fat droplets, estimated from the attenuation measurement.
| CAP Score (dB/m) | Steatosis Grade | Estimated Fat in Liver Cells |
| Below 238 | S0 | Less than 5% — normal, no significant fat |
| 238–259 | S1 | 5–33% — mild hepatic steatosis |
| 260–290 | S2 | 34–66% — moderate hepatic steatosis |
| Above 290 | S3 | Above 67% — severe hepatic steatosis |
What the table doesn’t convey — and what matters for reading your own result:
The FibroScan CAP score cutoffs are the same regardless of why someone developed fatty liver. Whether the cause is NAFLD from metabolic syndrome, alcohol use, medication effect, or rapid weight loss — the grading scale is the same. But what the grade implies for treatment and prognosis differs by cause. A S3 reading in a patient with uncontrolled Type 2 diabetes and central obesity has a different management path than S3 in someone who developed fatty liver secondary to a medication that’s now been stopped.
The other thing the table misses: a CAP score sitting just above a cutoff — say, 241 — is clinically closer to the S0 threshold than to the middle of S1. These are continuous measurements forced into discrete categories. A 241 and a 258 are both technically S1, but one is almost normal and one is approaching S2. Your gastroenterologist interprets the actual number, not just the grade label.
What Is a Good FibroScan Score for Fatty Liver?
For the FibroScan CAP score specifically, a good result is below 238 dB/m — S0, no meaningful hepatic steatosis. That’s the clean baseline.
For the liver stiffness kPa alongside it, a good result is below 6.0 kPa — F0–F1, no significant fibrosis. Both values below their normal thresholds simultaneously means the liver has no detectable fat accumulation and no detectable scarring. That’s the result you want.
But “good” in a follow-up context isn’t purely about the absolute value — it’s about direction and distance travelled.
Consider two patients, both with a current FibroScan CAP score of 255:
Patient A was at 302 twelve months ago. Diet changed, weight loss of 8%, exercise added consistently. The 255 is significant progress — still mild hepatic steatosis, but moving in the right direction with clear momentum. A follow-up in 6 months will likely show further improvement.
Patient B was at 228 (normal) eight months ago. Diet slipped, blood sugar control worsened, weight increased. The 255 is a deterioration — still mild steatosis numerically, but heading in the wrong direction. The trajectory here demands immediate attention, not reassurance.
Same number. Different stories. Which is why Dr. Vibhor Pareek at Gastro Plus reviews serial results together rather than reading each scan in isolation — the trend tells more than the number.
For the kPa specifically in fatty liver patients: a good result combined with hepatic steatosis is a kPa below 6. It means the fat is present but hasn’t triggered significant scarring yet. This is the most recoverable combination — the window for full reversal is still fully open.
Is Grade 3 Fatty Liver the Same as Fibrosis?
No — and this confusion is worth clearing up properly because it changes how patients understand their risk.
Grade 3 fatty liver (S3 on the FibroScan CAP score scale, or Grade 3 on ultrasound) means severe hepatic steatosis — the majority of liver cells are estimated to contain fat. This is a fat content measurement. It says nothing, by itself, about whether scarring has begun.
Liver fibrosis — measured by the kPa reading on FibroScan — is a completely separate process. It develops when fat accumulation triggers inflammation (NASH), and that inflammation causes liver cells to die and be replaced by scar tissue. Fat causes fibrosis indirectly, through the inflammatory cascade — not automatically, and not in every patient.
The relationship in practice:
- Grade 3 fatty liver with F0 fibrosis (kPa below 6): Severe fat, no scarring. The liver is carrying a large fat burden but hasn’t started structurally deteriorating in response to it yet. This scenario is still fully reversible — and critically, it’s the grade where acting now matters most.
- Grade 3 fatty liver with F2–F3 fibrosis (kPa 8–12): Both active. The fat has triggered enough inflammation to produce meaningful scarring. This needs specialist-directed management — lifestyle intervention alone at F3 is not sufficient without medical support.
- Grade 3 fatty liver with F4 fibrosis (kPa above 12.5): Severe fat alongside cirrhosis. The fibrosis is now the dominant clinical problem. Recovery from cirrhosis itself isn’t possible, but treating the underlying cause and controlling metabolic factors changes the long-term trajectory.
The grade tells you the fat content. The kPa tells you the structural damage. They’re correlated — higher NAFLD grades carry higher fibrosis risk over time — but they’re not the same thing. A high FibroScan CAP score is a warning about what could develop; the kPa is the measure of whether it already has.
Reading CAP Score and Liver Stiffness Together
The two numbers on a FibroScan report only tell a complete story when read together. Four combinations cover the clinical territory most patients land in:
High CAP, low kPa (S2–S3, F0–F1):
Significant fat, no meaningful fibrosis. The most actionable scenario. Every effective intervention is still available. Sustained weight loss of 7–10% combined with dietary correction and exercise at this stage consistently produces meaningful FibroScan CAP score reduction and prevents fibrosis from developing. This combination doesn’t need panic — it needs a plan and follow-through.
High CAP, high kPa (S2–S3, F2–F4):
Fat and fibrosis together. The progression from simple steatosis to NASH to fibrosis has happened. Urgency depends on the kPa level — F2 needs a structured specialist plan; F3 needs prompt specialist review; F4 needs immediate workup and complication screening.
Low CAP, high kPa (S0–S1, F2–F4):
Minimal fat with significant fibrosis. This is the combination that catches people off guard — a near-normal CAP score alongside a concerning kPa. It suggests the cause of fibrosis is non-metabolic: Hepatitis B, Hepatitis C, alcohol-related, autoimmune, or burnt-out NASH where the fat has resolved as fibrosis advanced. Needs a cause investigation; the near-normal FibroScan CAP score is not reassurance here.
Low CAP, low kPa (S0, F0–F1):
Clean result. Reassuring baseline. Continue addressing the underlying risk factor that prompted the scan, and repeat in 1–2 years.
Read More: Fatty Liver Grade 2 — Symptoms, Risks and Recovery Timeline
What Affects the Accuracy of Your CAP Score?
The controlled attenuation parameter is reliable in most clinical contexts — but several factors can push it artificially high or low. Knowing them prevents one scan from being misread as definitive.
Factors that raise the CAP score artificially:
- Eating within 2 hours of the scan — food in the stomach affects signal behaviour; this is the most common technical issue and the reason fasting is recommended
- Large meals before scanning — post-prandial liver changes temporarily elevate the reading
- Very high BMI — standard probe depth may be insufficient; if BMI is above 35–40, an XL probe produces more reliable results
Factors that reduce reliability overall:
- IQR/M ratio above 30% on the report — this figure reflects variability across the 10 measurements taken; when it’s above 30%, the result is considered less reliable and a repeat is often recommended
- Narrow intercostal spaces making probe positioning difficult
- Dehydration — modestly affects measurement consistency
What doesn’t affect it:
Normal hydration levels, time of day, or mild activity. The FibroScan CAP score is consistent across properly standardised conditions. If the scan was done fasted on a stable day with a valid IQR/M ratio — the number is reliable.
How to Lower Your FibroScan CAP Score
The FibroScan CAP score is the most responsive liver health marker available — it reflects current fat content, and fat responds to metabolic change faster than fibrosis does. Meaningful improvement is documentable on a repeat scan within 3–6 months of consistent intervention.
What the evidence consistently supports:
Weight loss — the most impactful single intervention:
- 3–5% body weight loss begins reducing hepatic steatosis measurably
- 7–10% sustained loss is where steatosis grade improvement on FibroScan becomes consistent and significant
- Beyond 10% — S3 can move to S1 in patients who sustain it
Dietary correction:
- Reduce refined carbohydrates and added sugars — the liver converts excess fructose and glucose directly to fat
- Mediterranean-pattern eating has the strongest specific evidence for NAFLD and hepatic steatosis reduction
- Eliminate or significantly reduce alcohol — no safe minimum for elevated CAP scores
- Smaller, more frequent meals reduce peak fat delivery to the liver
Physical activity:
- 150+ minutes weekly moderate aerobic exercise reduces hepatic steatosis measurably, independent of weight loss
- Resistance training twice weekly adds benefit beyond aerobic activity alone through improved insulin resistance
- Consistency matters more than intensity — 30 minutes daily walking beats sporadic high-intensity sessions
Metabolic control:
- HbA1c improvement in diabetic patients directly reduces liver fat synthesis
- GLP-1 agonists and SGLT-2 inhibitors have accumulating evidence for direct hepatic steatosis reduction beyond glycaemic effects — ask your specialist
Conclusion
The FibroScan CAP score is the liver’s fat meter — precise, non-invasive, and responsive enough to show meaningful change within months when the right things change. Most patients who receive a high number are focused on the wrong question: how bad is it? The better question is: which direction is it moving, and what’s going to move it?
Hepatic steatosis at S1, S2, or even S3 — with a kPa still in the normal range — is a problem with a clear, well-documented solution. Weight loss, dietary correction, metabolic control. The liver at this stage is still yielding. It hasn’t scarred. It’s carrying fat it can absolutely shed.
Know your number. Understand what drives it. Get a plan that targets the driver — not just the symptom.
A High CAP Score Has a Clear Path Forward — But It Needs a Plan, Not Just a Printout.
Most patients with an abnormal FibroScan CAP score leave their scan with a number and a vague recommendation. At Gastro Plus, the number gets context — reviewed alongside kPa, blood work, metabolic history, and a structured follow-up schedule that tells you exactly what the liver needs next.
Dr. Vibhor Pareek and the Gastro Plus team offer:
- FibroScan in Gurgaon — controlled attenuation parameter and liver stiffness measurement with same-session specialist interpretation
- NAFLD staging and management — grading hepatic steatosis, confirming fibrosis stage, and building a treatment plan that matches where you are
- Metabolic liver disease consultation — diabetes, dyslipidaemia, and obesity managed in coordination with liver health improvement
- Serial FibroScan monitoring — tracking CAP score and kPa response over time as lifestyle and medical interventions take effect
- Dietary and lifestyle prescription — specific to your steatosis grade and fibrosis stage, not generic advice
👉 Book a Consultation at Gastro Plus
Frequently Asked Questions
Q1. What are 5 signs of a fatty liver?
Fatty liver — even at moderate to severe steatosis grade — is usually silent. When signs appear:
- Dull heaviness or pressure under the right ribcage, particularly post-meal
- Persistent fatigue that doesn’t resolve with rest
- Mildly elevated SGPT or SGOT on blood work — often the first objective clue
- Bloating and early satiation after meals
- Unexplained weight changes alongside consistently abnormal liver enzymes
Most people discover hepatic steatosis through an ultrasound or FibroScan done for another reason entirely.
Q2. What does a FibroScan of 75 mean?
A kPa reading of 75 is severely elevated — far beyond the cirrhosis threshold of 12.5 kPa. Clinically, this suggests very advanced liver fibrosis with significant active inflammation simultaneously, or a technical reading in a patient with confounding factors like severe cardiac congestion or acute hepatitis. At this level, immediate specialist evaluation is essential — complication screening for varices, ascites, and liver cancer, plus a full cause assessment. This is not a result to defer.
Q3. Can a FibroScan CAP score improve quickly?
Yes — fat responds faster than fibrosis. The FibroScan CAP score can drop measurably within 3–6 months of sustained intervention:
- Dietary change reducing refined carbohydrates and fructose
- 5–7% body weight loss
- 150+ minutes weekly aerobic activity
The kPa (liver stiffness) typically takes longer — 12 months or more — before fibrosis regression shows on a repeat scan. Expect the fat number to improve before the scar number does.
Q4. Is a CAP score of 300 dangerous?
A CAP score of 300 indicates severe hepatic steatosis (S3) — significant fat accumulation. Whether it’s immediately dangerous depends entirely on the kPa reading alongside it. CAP 300 with kPa below 6 = severe fat, no scarring, fully recoverable. CAP 300 with kPa above 10 = severe fat with significant fibrosis, needs specialist-directed management. The controlled attenuation parameter alone doesn’t determine urgency — the combination does.
Q5. Does fasting before FibroScan affect the CAP score?
Significantly. Eating within 2 hours before the scan is the most common technical factor that artificially elevates the FibroScan CAP score — food in the stomach alters portal blood flow and signal behaviour. Most guidelines recommend a minimum 2-hour fast before scanning. Alcohol should be avoided for at least 24 hours before. A scan done without fasting may overestimate hepatic steatosis and should ideally be repeated under proper fasting conditions before any clinical decisions are made.
Q6. Can you have a high CAP score with normal liver enzymes?
Yes — and it’s common. Hepatic steatosis doesn’t reliably elevate SGPT or SGOT, particularly in the earlier grades. Many patients with S2 or even S3 on FibroScan CAP score have entirely normal liver function tests. Normal enzymes do not mean normal liver fat content. This is one of the key limitations of using enzymes alone to monitor fatty liver — they miss a significant proportion of patients with meaningful NAFLD who would otherwise qualify for intervention.
