Antistreptolysin O is a blood test that checks for an antibody to a toxin (Streptolysin O), produced against Streptococcus(GAS) bacteria.
Interpretation:If the patient has symptoms of poststreptococcal infection, complications like bacterial endocarditis, glomerulonephritis and rheumatic fever, the clinician orders ASO test. ASO peaks between three to eight weeks after a streptococcus infection. Levels may remain high for several months. Usually, when a patient has a streptococcus infection like strep throat, the doctor will give antibiotics to kill the bacteria but some patients might not have symptoms of the infection. In this case, an untreated infection may cause poststreptococcal complications. Therefore, the doctor can determine if the patient has has a recent streptococcal infection with ASO blood levels.
Sample: Arm vein blood. Nonfasting
Working day: Everyday
Result Time: Same day 6:00 PM
