What can a blood test tell you about your liver?
The liver is an important organ in the body. It processes essential nutrients from food, including proteins, carbohydrates and fats, helps regulate cholesterol, metabolizes medications and alcohol and removes waste products from the body. A simple blood test called a liver panel, which also can be part of a comprehensive metabolic panel (CMP), is an important first step in evaluating your liver health. Dr. Gagan Sood, a liver specialist and professor of medicine at Baylor College of Medicine, explains how liver blood tests can provide early warning signs of liver disease.
"Liver disease is often silent in its early stages but can progress over time. Liver blood tests can help detect abnormalities early, even before symptoms develop," Sood said.
Within the liver panel, alanine aminotransferase (ALT) and aspartate aminotransferase (AST) can indicate injury to liver cells. Alkaline phosphatase (ALP) can show information about bile flow and may suggest blockage or other problems affecting the bile ducts. These blood tests can provide important clues about liver injury, but normal liver tests do not always rule out liver disease. In some cases, additional tests may be needed.
"The liver panel is like the dashboard of your car. The results can signal if something is wrong with your liver and help guide us toward further evaluation," Sood said.
Sood cares for patients with a wide range of liver diseases – the most common being fatty liver disease.
“Fatty liver disease can be associated with alcohol consumption, but an increasingly common form is metabolic dysfunction-associated steatotic liver disease (MASLD),” Sood said. “MASLD is linked to obesity, diabetes, high cholesterol and other metabolic conditions. Fat can accumulate in the liver without causing noticeable symptoms, and over time some people may develop inflammation, scarring, cirrhosis and even liver cancer.”
He adds that early detection, weight management, regular physical activity, healthy eating and appropriate treatment of diabetes and high cholesterol can improve liver health and reduce the risk of serious complications. He also emphasizes the importance of discussing dietary supplements with healthcare providers.
“Natural does not always mean safe. Certain herbal supplements, including concentrated green tea extracts, bodybuilding products and weight-loss supplements, have been linked to liver injury. Patients should always inform their healthcare providers about any supplements they are taking and consult a physician before starting products marketed as liver cleanses or detox remedies,” Sood said.
Liver disease can develop silently, but early recognition can make a difference. People with diabetes, obesity, high cholesterol, significant alcohol use or other risk factors should talk with their healthcare provider about whether liver testing is appropriate. Protecting your liver now can help prevent serious complications in the future.
