<unk>  can be diagnosed by a speech language pathologist (SLP) through specific exams that measure oral mechanisms of speech. The oral mechanisms exam involves tasks such as pursing lips, blowing, licking lips, elevating the tongue, and also involves an examination of the mouth. A complete exam also involves observation of the patient eating and talking. Tests such as the Kaufman Speech Praxis test, a more formal examination, are also used in diagnosis. A differential diagnosis of DVD/CAS is often not possible for children under the age of two years old. Even when children are between 2–3 years, a clear diagnosis cannot always occur, because at this age, they may still be unable to focus on, or cooperate with, diagnostic testing.
Developmental verbal dyspraxia
Nonverbal autism
Selective mutism
Klismaphilia
Trichothiodystrophy
Tardive dysmentia
Multiple complex developmental disorder
Zellweger spectrum disorders