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3 comments:
What are liver function tests?
As the liver performs its various functions, it makes chemicals that pass into the bloodstream and bile. Various liver disorders alter the blood level of these chemicals. Some of these chemicals can be measured in a blood sample. Some tests that are commonly done on a blood sample are called liver function tests (LFTs). These usually measure the following:
Alanine transaminase (ALT). This is an enzyme that helps to process proteins. (An enzyme is a protein that helps to speed up chemical reactions. Various enzymes occur in the cells in the body.) Large amounts of ALT occur in liver cells. When the liver is injured or inflamed (as in hepatitis), the blood level of ALT usually rises.
Aspartate aminotransferase (AST). This is another enzyme usually found inside liver cells. When a blood test detects high levels of this enzyme in the blood it usually means the liver is injured in some way. However AST can also be released if heart or skeletal muscle is damaged. For this reason ALT is usually considered to be more specifically related to liver problems.
Alkaline phosphatase (ALP). This enzyme occurs mainly in liver cells next to bile ducts, and in bone. The blood level is raised in some types of liver and bone disease.
Albumin. This is the main protein made by the liver, and it circulates in the bloodstream. The ability to make albumin (and other proteins) is affected in some types of liver disorder. A low level of blood albumin occurs in some liver disorders.
Total protein. This measures albumin and all other proteins in blood.
Bilirubin. This chemical gives bile its yellow/green colour. A high level of bilirubin in your blood will make you jaundiced ('yellow'). Bilirubin is made from haemoglobin. Haemoglobin is a chemical in red blood cells that is released when the red blood cells break down. Liver cells take in bilirubin and attach sugar molecules to it. This is then called 'conjugated' bilirubin which is passed into the bile ducts.
A raised blood level of 'conjugated' bilirubin occurs in various liver and bile duct conditions. It is particularly high if the flow of bile is blocked. For example, by a gallstone stuck in the common bile duct, or by a tumour in the pancreas. It can also be raised with hepatitis, liver injury, or long-term alcohol abuse.
A raised level of 'unconjugated' bilirubin occurs when there is excessive breakdown of red blood cells - for example, in haemolytic anaemia.
Dr Sarah Jarvis: What does Blood Liver Function Testing do?
Other tests of the liver
LFTs are useful, and are often the first marker of disease in the liver. However, other tests of the liver may also be done to confirm the diagnosis of a particular disorder, and/or to monitor the activity of the disorder and response to treatment.
Other blood tests which may be done include:
Blood clotting tests. The liver makes many of the proteins needed to make blood clot. In certain liver disorders the liver cannot make enough of these proteins and so blood does not clot so well. Therefore, blood clotting tests may be used as a marker of the severity of certain liver disorders. See separate leaflet called Blood Clotting Tests.
Gamma-glutamyltransferase (GGT or 'gamma GT'). This is another enzyme that occurs in liver cells. A high level of this enzyme is particularly associated with heavy alcohol drinking. (The liver breaks down and clears alcohol from the body and this enzyme is involved in the process.)
Immunology. Blood tests may be done to detect:
Viruses and antibodies to viruses. Various viral infections can cause hepatitis (inflammation of the liver) - for example, hepatitis A virus, hepatitis B virus, etc.
Auto-antibodies. These are antibodies which attack a part of your own body and occur in autoimmune disorders. The most common autoimmune disorders of the liver are:
Primary biliary cirrhosis (associated with anti-mitochondrial antibodies).
Autoimmune hepatitis (associated with smooth muscle antibodies).
Love this pic. Cheers!
proyatt chleung team kdor veuil!
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