6/2/10. Until there is a biological marker for ADHD --- , there will be no convincing some skeptics that ADHD exists and that medication helps many people cope with the chronic and pervasive symptoms of distractibility, restlessness, and self-control. Those with ADHD have significant problems filtering out external distractions and "putting the brakes" on their behaviors.
ADHD is not the only psychiatric disorder without a biological marker. In fact, etiology unknown with no biological marker is true for all psychiatric disorders.
Tests for ADHD often claim to take the subjectivity out of the diagnostic process.
These so-called objective tests are no substitute for clinical experience and sound judgment.
http://www.nytimes.com/2010/06/01/health/01attention.html?hpw
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