Alkaline Phosphatase
Understanding Alkaline Phosphatase
What is Alkaline Phosphatase?
The alkaline phosphatase test is used to check the level of alkaline phosphatase enzyme present in the bloodstream of an individual. The enzyme test is important for screening, diagnosis, and monitoring the health of the liver, gallbladder, and bile ducts. A medical expert will take a small amount of blood sample from the arm vein and do the enzyme analysis. The needle piercing may cause a faint pain for one or two days.
The abnormal levels of alkaline phosphatase enzyme in the blood indicate liver problems, gallstones, abnormal tissue growth, or cancers. Depending upon the age, the diagnosis, and the prognosis of the problem, the doctor will plan a course of treatment to bring back the enzyme levels to the normal range.
What is Alkaline Phosphatase used for?
The Alkaline Phosphatase, Serum test is done:
As a part of the liver function test
If you have signs or symptoms of a liver disorder like loss of appetite, nausea, vomiting, fatigue, abdominal pain, jaundice, and itching
If you have signs or symptoms of bone disease like bone pain and increased frequency of fractures
What does Alkaline Phosphatase measure?
The alkaline phosphatase, serum test measures the alkaline phosphatase levels in the blood. Alkaline phosphatase (ALP) is an enzyme which is found in various tissues throughout the body. The maximum concentrations of ALP are present in cells of bone and liver. Usually, raised levels of ALP are caused due to liver disease or bone disorders.
ALP is found in the liver on the cell edges that join to form bile ducts. The bile ducts are the tiny tubes which drain bile from the liver to the bowels. The bile juice formed is required by the small intestine to help digest fat in the diet.
ALP is produced by osteoblasts cells in the bone which are involved in bone formation. The various tissue types produce distinct forms of ALP which are known as isoenzymes.
The levels of ALP generally increase to a great extent if one or more bile ducts get blocked. The reason could be inflammation of the gallbladder which is known as cholecystitis or the presence of gallstones. The small amount of increase of ALP in the blood can be seen in liver cancer and cirrhosis. These high levels can also be observed if there is intake of medications toxic to the liver and hepatitis.
In conditions, where there is formation of excessive bones such as Paget’s disease one can also have increased levels of ALP. Along with that, higher blood ALP levels can be seen in children and adolescents, as they are in the growing stage and so are their bones.
Interpreting Alkaline Phosphatase results
Interpretations
Alkaline phosphatase, serum: 74 - 390 U/L.
Reference range may vary from lab to lab*