Since no lab test can determine whether or not a teenager—or anyone, for that matter—has ADHD, health care professionals rely on detailed questionnaires and interviews. Results from these can pinpoint the behaviors that make up an ADHD diagnosis. Expect an in-office assessment using standardized rating scales and a review of your teen's school records. The doctor will also evaluate his or her emotional functioning and developmental achievements. Symptoms to look for include distractibility, trouble concentrating, moodiness, attention problems, insomnia, and impulsive acts that seem above and beyond normal teenage behavior.

• Teens who have ADHD are more likely to abuse drugs and alcohol—in fact, they're three times more likely to abuse drugs other than marijuana.
• Car accidents are two to four times more common in teens who have ADHD.
• Social problems may trouble teens who have ADHD, because they're often too distracted to perform well in school, athletics, or in extra curricular activities.
• Drug abuse, particularly stimulants like cocaine, can cause behavioral problems whose symptoms mimic ADHD.
• Other problems, including learning disabilities, anxiety disorders, and serious conduct and behavior issues, can go hand-in-hand with ADHD.

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