The blood sample for liver function tests is usually taken from a vein in your arm. However, it also can be higher if you're taking certain blood-thinning drugs, such as warfarin. PT is the time it takes your blood to clot. However, other conditions also may cause higher levels of LD. This test is nonspecific and may be elevated in conditions other than liver disease. Higher-than-usual levels may mean liver or bile duct damage. At times, conditions such as a blockage of the liver ducts or certain types of anemia also can lead to elevated bilirubin. Higher levels of bilirubin might mean liver damage or disease. Bilirubin passes through the liver and is excreted in stool. Bilirubin is a substance produced during the breakdown of red blood cells. These low levels also can be seen in other gastrointestinal and kidney-related conditions. Lower-than-usual levels of albumin and total protein may mean liver damage or disease. Your body needs these proteins to fight infections and to perform other functions. Albumin is one of several proteins made in the liver. Higher-than-usual levels of ALP may mean liver damage or disease, such as a blocked bile duct, or certain bone diseases, as this enzyme is also present in bones. ALP is an enzyme found in the liver and bone and is important for breaking down proteins. This test is sometimes referred to as SGOT. An increase in AST levels may mean liver damage, liver disease or muscle damage. Like ALT, AST is usually present in blood at low levels. AST is an enzyme that helps the body break down amino acids. This test is sometimes referred to as SGPT. When the liver is damaged, ALT is released into the bloodstream and levels increase. ALT is an enzyme found in the liver that helps convert proteins into energy for the liver cells. Some common liver function tests include: The pattern and degree of elevation of these tests along with the overall clinical picture can provide hints to the underlying cause of these problems. Levels that are higher or lower than usual can mean liver problems. Liver function tests check the levels of certain enzymes and proteins in your blood. Monitor possible side effects of medicines.Look for signs of serious disease, particularly scarring of the liver, called cirrhosis.Monitor a disease, such as viral or alcoholic hepatitis, and determine how well a treatment is working.Screen for liver infections, such as hepatitis.
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