ALP clinically stands for alkaline phosphatase, which hydrolyzes phosphate in an alkaline environment to produce phosphate. Alkaline phosphatase exists in free form in the human liver, small intestine and bones, and most of the ALP in human serum originates from the liver and bones, so ALP is often used as one of the indicators to detect liver or bone diseases. elevated ALP is usually associated with human bone growth and development, female pregnancy, etc., and some elevations are caused by pathological factors. 1, digestive system diseases: such as gallstones caused by biliary obstruction, primary biliary cirrhosis, obstructive jaundice, etc., ALP is significantly elevated, and the bilirubin level of obstructive jaundice will also be significantly elevated. If the patient has hepatitis, cirrhosis, etc., ALP will appear mildly elevated, primary liver cancer, metastatic liver cancer, liver abscess, etc. ALP is significantly elevated, alanine aminotransferase is not significantly elevated, and serum bilirubin is mostly normal; 2. Skeletal diseases: when skeletal diseases such as fibrous osteitis, metastatic osteoma, rickets, osteochondrosis, etc. are present, ALP in the serum will be found to be elevated during the examination; 3. Other: such as severe anemia or malnutrition, hyperthyroidism and other conditions may also lead to elevated ALP.