When serum amyloid is measured, enzyme immunoassay, radioimmunoassay, and immunoscattering assay can be chosen for testing. Serum amyloid is a protein produced by hepatocytes that binds to serum HDL and is a very sensitive indicator that can rise rapidly during an infection and fall to normal levels after the infection is controlled. Increased levels of serum amyloid can be seen in viral infections, bacterial infections, mycoplasma infections, etc. It is a relatively sensitive and specific protein that rises rapidly within 6 hours of inflammatory infections and is very important in the determination of rheumatic diseases, herpes simplex oral inflammation, and hand, foot and mouth disease. For serum amyloid testing, it is recommended to consult the internal medicine department of a regular hospital, and not to be negligent so as not to delay the condition.