SAA 17.9 means that the concentration of serum amyloid A(SAA) is 17.9 mg/L. SAA is an acute phase protein mainly derived from hepatocytes, and its normal range is 0 to 10 mg per liter. When the content of SAA in blood is low, it may indicate that there is inflammation in the patient.

The above contents are for reference only. It is recommended to consult a professional doctor for more accurate information.