SAA is an alias for serum amyloid A, an acute time-phase protein derived primarily from liver cells. SAA levels are usually measured clinically for diagnosis and monitoring of infectious diseases, such as pneumonia and mumps in children, and combined with other inflammatory indicators such as white blood cell counts to analyze the pathogens that the patient may be infected with, and non-infectious diseases are also tested separately for SAA to assist in diagnosis and analysis of the condition, such as rheumatoid arthritis. The normal range of SAA is 0 to 10mg/L, which is extremely low in the blood. As long as the blood concentration of SAA exceeds 10mg/L, it is recognized as an abnormality, suggesting that inflammation exists in the patient’s body, and if the SAA rises rapidly to a higher value, it indicates that the inflammation is more serious. If the patient’s blood concentration of SAA exceeds 10mg/L, he/she may experience uncomfortable symptoms such as fever, chills, pain, and profuse sweating, etc. These uncomfortable symptoms should go to the hospital in time and ask the doctor for treatment.