Understanding CAP (Controlled Attenuation Parameter) Fatty Liver: Normal vs Optimal Ranges

?What is CAP (Controlled Attenuation Parameter) Fatty Liver?

CAP (Controlled Attenuation Parameter) is a non-invasive ultrasound-based measurement that quantifies fat content in the liver. It uses transient elastography technology to assess hepatic steatosis (fatty infiltration) and is expressed in decibels per meter (dB/m). Values below 238 dB/m are generally considered normal, while higher values may suggest increasing levels of liver fat accumulation.

!Why It Matters

Elevated CAP scores may suggest fatty liver disease (NAFLD or AFLD), which can be associated with metabolic dysfunction, inflammation, and progressive liver damage if left unaddressed. Monitoring CAP helps identify early-stage liver fat accumulation before more serious fibrosis or cirrhosis develops, enabling timely lifestyle or clinical intervention.

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Fatigue and low energy
• Right upper abdominal discomfort or heaviness
• Abdominal bloating or distension
• Difficulty losing weight despite diet efforts
• Brain fog or difficulty concentrating

How to Improve Your Levels

• 1Reduce refined carbohydrate and added sugar intake; prioritise whole grains and fibre
• 2Limit alcohol consumption or eliminate it entirely
• 3Increase physical activity; aim for 150 minutes of moderate aerobic exercise weekly
• 4Achieve and maintain a healthy body weight through balanced nutrition
• 5Include omega-3 rich foods (fatty fish, flax, walnuts) and antioxidant-rich vegetables
• 6Manage underlying metabolic conditions such as insulin resistance and dyslipidaemia

When to Test

CAP is useful for individuals with metabolic risk factors (obesity, type 2 diabetes, metabolic syndrome), abnormal liver enzymes, a history of heavy alcohol use, or family history of liver disease. Periodic monitoring may be recommended for those diagnosed with fatty liver disease.

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