My child was negative for a strep culture. Should I have get ASO or AntiDNAse B tests?
Yes, ASO and Anti-DNAse together are better than either test individually; however, you still need to determine when you likely were exposed to strep. ASO rises approximately 1-4 weeks from colonization and Anti-DNAseB rises between 6-8 weeks from colonization. Even then ASO and Anti-DNAse B together fail to show a rise in 31% of children with strep colonization.
