Liver Ultrasound
A liver ultrasound is the usual first test for fat in the liver - a bright, echogenic liver on the scan, which is very common with excess weight.
Plain English
Patient-Friendly Explanation
A liver ultrasound is a painless scan that uses sound waves, not radiation, to show the size, shape and texture of the liver. The probe is moved over the upper abdomen and takes only a few minutes; you usually need to fast for a few hours beforehand, because a full stomach hides the view. In weight management it is the standard first test for fat in the liver. Fat in liver cells makes the organ reflect sound more strongly, so it looks bright - radiologists call it increased echogenicity - and this is how fatty liver is usually first detected, very often incidentally. The scan also shows gallstones, cysts, an enlarged liver and signs of more advanced liver disease, and it can estimate how stiff the liver is when extra measurements are added. Its limits are worth knowing: it cannot reliably say how much fat is present, it cannot see inflammation, and it is not as accurate as MRI for small amounts of fat, so it is always read together with your blood tests. If the scan shows simple fat, the treatment is the same as for your weight - and the fat usually begins to clear within months of losing 5 to 10 per cent of body weight.
Medical
Clinical Definition
Abdominal ultrasound is the recommended first-line imaging investigation for suspected hepatic steatosis and is widely used to screen for metabolic dysfunction-associated steatotic liver disease (MASLD) in at-risk patients. Steatosis produces a diffuse increase in hepatic parenchymal echogenicity with increased liver-to-kidney contrast, impaired visualisation of intrahepatic portal vein walls and of the diaphragm, and often hepatomegaly, graded subjectively as mild, moderate or severe. Sensitivity for detecting steatosis of more than 20 to 30 per cent is approximately 85 to 95 per cent, but it falls markedly below that threshold, so ultrasound cannot exclude mild steatosis and is unreliable for quantifying fat or for detecting change over time; it is also operator and body-habitus dependent, and higher body mass index and rib-adjacent liver segments reduce image quality. Ultrasound reliably identifies gallstones, biliary dilatation, focal fatty change and focal sparing, hepatic cysts and hepatic venous congestion, and it can demonstrate features suggestive of cirrhosis such as surface nodularity, caudate hypertrophy, splenomegaly and portal hypertension, but it does not stage fibrosis. Quantitative approaches - the hepatorenal index, attenuation imaging and the controlled attenuation parameter obtained with vibration-controlled transient elastography - improve accuracy, while magnetic resonance imaging with proton density fat fraction provides the current reference standard for hepatic fat quantification. In practice ultrasound is combined with liver enzymes, serological fibrosis scores and, where fibrosis is suspected, elastography or referral. Ultrasonographic steatosis improves with weight loss of 5 to 10 per cent of body weight, although the modality is too coarse to follow modest changes reliably.
Key Insight
Why It Matters
An ultrasound is the simplest way to see whether extra weight has reached your liver - and the fat it shows is usually the first thing to improve once you start losing. We arrange it at assessment when your liver enzymes or your waist suggest it is worth a look.
Sources
Reviewed against standard medical references.
Medically reviewed by
Family Physician & Registered Acupuncturist, Accord Medical Clinic. MBBS (NUS), Graduate Diploma in Family Medicine (NUS), Graduate Diploma in Acupuncture (Singapore College of TCM).
Last reviewed: September 2026
This page is general health education, not medical advice. Whether any treatment is appropriate for you is a decision made in consultation after assessment.
