According to Wambaugh's AOS Dx, if most features in category B and some in category A are present, the probability of AOS is which?

• A. High probability
• B. Moderate probability
• C. Low probability
• D. No AOS

Answer: (B)

In Wambaugh's AOS Dx framework, the pattern of features across two categories guides how confident you can be about apraxia of speech. Category B contains the more diagnostic indicators, while Category A has supportive but less specific signs. When most of the Category B features are present and there are also some Category A features, the evidence points strongly toward AOS, but not so strongly that it’s considered highly certain. That middle ground is why the result is a moderate probability. If you saw nearly all Category B features (and strong Category A support), you’d lean toward a higher probability. If only a few Category B features were present or you had little Category A evidence, the probability would be lower. The absence of both types would suggest no AOS.