Assessing an adolescent for a possible substance use disorder can be streamlined by choosing age-appropriate screening tools and asking targeted questions. Based on our experience, we offer a 4-step approach to these at-risk patients1 (Box) that focuses on:
- quantifying alcohol or drug abuse and/or dependence
- identifying and treating psychiatric comorbidity
- evaluating and addressing social influences that contribute to substance use
- assessing negative consequences associated with substance abuse.
Adolescent substance use increases the risk of motor vehicle accidents, suicide, transmission of HIV and other sexual diseases, criminal behaviors, and psychological problems. Alcohol and marijuana are the substances most commonly abused by adolescents.
In 2002, the University of Michigan Institute for Social Research’s annual “Monitoring the Future” study reported:
- drunkenness in 7% of 8th graders, 18% of 10th graders, and 30% of 12th graders at least once in the previous 30 days.
- illicit drug use by 18% of 8th graders, 35% of 10th graders, and 41% of 12th graders in the previous 12 months.
Boys used substances more frequently than girls, and boys’ use was more severe. Within the previous month, boys reported greater alcohol use, binge drinking (five or more drinks in one sitting), and heavy drinking, as well as greater illicit drug use in the past year.1
INITIAL EVALUATION
Adolescents generally do not seek substance abuse treatment but are referred because of alcohol- or drug-related legal, school, or family problems. Thus, most present for evaluation with their parents, legal guardians, or officers of the court.
We begin by finding out from parents or guardians the reasons for the evaluation, their perspectives on the adolescent’s behavior, and their expectations of treatment. Then we interview the adolescent alone, assessing for substance use and evaluating peer relationships.
Components. A typical initial evaluation takes 90 minutes to 2 hours and includes:
- psychiatric history and symptoms
- medical history
- previous hospitalizations (medical and psychiatric)
- family history
- social history.
Specifically, the assessment focuses on the reason for the evaluation, with attention to diagnostic criteria for substance use/dependence.
STEP 1: QUANTIFYING DEPENDENCE
As with adults, clinical diagnosis of substance abuse or dependence in adolescents is based on DSM-IV diagnostic criteria (Table 1). Adolescents, however, differ from adults in diagnostic presentation, risk of dependence, and patterns of substance use.
Diagnostic ‘orphans.’ DSM-IV criteria for alcohol use disorders have limitations in adolescents.2 Teens who report one or two dependence symptoms and no abuse symptoms have been described as “diagnostic orphans”3—they fall short of criteria for dependence or abuse but clearly demonstrate substance use patterns. This presentation is common; in a survey of 74,008 high school students, almost 10% of 12th graders reported one or two dependence symptoms and no abuse symptoms.4
Risk of dependence. Adolescents who begin using alcohol or drugs develop dependence more rapidly than adults do.5
Patterns of use. Adolescents are more likely than adults to binge with alcohol and drugs, which may conceal the severity of their abuse. DSM-IV diagnostic criteria for substance abuse or dependence do not consider quantity of use, such as number of drinks or percent of days drinking or using drugs.
Assessment instruments. Many assessment instruments are available to explore adolescent substance use and its associated consequences. Some are described in detail and are available on the Internet. Common screening instruments that can be used for adolescent substance use are compared in Table 2.
DUSI-A and POSIT. Two self-report instruments—Drug Use Screening Inventory-Adolescents (DUSI-A)6 and Problem Oriented Screening Instrument for Teenagers (POSIT)7—can help explore alcohol or drug use in teens who admit to substance use. Anyone who endorses at least one DSM-IV abuse or dependence criterion requires further evaluation. Either test is a good starting point, and both have a built-in “lie” scale.
T-ASI and CASI. The Teen Addiction Severity Index (T-ASI)8 and Comprehensive Adolescent Severity Inventory (CASI)9 are more labor-intensive and require training to administer. These assessments are more appropriate for adolescents with extensive alcohol or drug abuse.
A-OCDS and Deas-MOCS. Our group recently developed the Adolescent Obsessive Compulsive Drinking Scale (A-OCDS)10 and the Deas-Marijuana Obsessive Compulsive Scale (Deas-MOCS).11
These self-report instruments have been validated in treatment- and nontreatment-seeking adolescents and young adults in inpatient and outpatient populations. They are sensitive and specific in identifying problem drinkers and marijuana users, respectively, and are quick, useful screens to determine need for further assessment.
Toxicology is useful for initial assessment and to monitor substance use patterns during treatment.
Urine samples are used to assess marijuana, sedative/hypnotic, amphetamine, cocaine, opiate, and phencyclidine use. Alcohol may be detected in urine, but alcohol levels detected by blood and breath testing are more accurate.