Ph value, also called pH, is a reaction to the acidity or alkalinity of a solution. There are different body fluids in the human body, such as: blood, joint fluid, saliva, gastric fluid, bile, gastric juice, pancreatic juice, urine, etc. The acidity and alkalinity of each body fluid varies. The Ph value of blood is 7.35-7.45; urine is 5.0-7.0; tissue fluid is 7.0-7.4; gastric juice Ph value is 7.0-7.2 when the stomach is emptying, 2-3 when eating; pancreatic juice is 7.8-8.4; bile is 7.4. So Ph value 5.4 needs to be clear which body fluid test result, if it is blood, it is low; if it is urine, it should be a normal result.