The liver has many important metabolic functions - it converts the nutrients in your diet, including fats, carbohydrates and proteins, into substances that your body can use. It also stores vitamins and minerals and supplies cells with them when needed.
Your liver also has an important detoxifying role - it processes drugs and alcohol and filters toxic chemicals, converting them into harmless substances or making sure they are released from the body.
Your liver processes drugs and alcohol, filters toxic chemicals, stores vitamins and minerals, and makes bile, proteins and enzymes. This liver function test examines enzymes and other markers for evidence of damage to your liver cells or a blockage near your liver which can impair its function.
Removed from the body by the liver, and elevated levels may indicate liver disease.
Conjugated, or direct, bilirubin travels freely through your bloodstream to your liver. Most of this bilirubin passes into the small intestine. A very small amount passes into your kidneys and is excreted in your urine. This bilirubin also gives urine its distinctive yellow color.
Alkaline phosphatase (ALP) is an enzyme located mainly in the liver and the bones. High levels can indicate liver disease.
Aspartate aminotransferase (AST) is an enzyme created mainly by the liver and the heart. High levels can indicate damage to your liver caused by alcohol, drugs or hepatitis.
Alanine aminotransferase (ALT) is an enzyme mainly produced by the liver. A good indicator of liver damage caused by alcohol, drugs or hepatitis.
Gamma-glutamyl transferase (GGT) is a liver enzyme which can be used to diagnose alcohol abuse as it is typically raised in long term drinkers.
Albumin is a protein which keeps fluid from leaking out of blood vessels, nourishes tissues, and carries hormones, vitamins, drugs, and ions like calcium throughout the body. Albumin is made in the liver and is sensitive to liver damage.
Any of a group of simple proteins found in the blood.
A measure of all of the proteins in the plasma portion of your blood. Proteins are important building blocks of all cells and tissues - they are important for body growth and health.
Your finger prick test kit and all instructions are posted directly to you, and there is no need to visit a collection centre.
Fast from all food and drink other than water for at least 8 hours, and no more than 12 hours prior to your test.