What is the role of streptococcal antibody testing in the diagnosis of scarlet fever?

Updated: Jun 21, 2019
  • Author: Bahman Sotoodian, MD; Chief Editor: William D James, MD  more...
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Answer

Streptococcal antibody tests (eg, antideoxyribonuclease B [ADB] and antistreptolysin O [ASO] titers) are used to confirm previous group A streptococcal infection. The most commonly available streptococcal antibody test is the ASO test. An increase in ASO titers can sometimes be observed but is a late finding and usually of value only in retrospect.

Streptococcal antibody tests can provide confirmatory evidence of recent infection but have no value in acute infection and currently are not indicated in this setting. They may be of value in patients with suspected acute renal failure or acute glomerulonephritis.


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