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Diagnosis and Treatment

Diagnosis of ADHD in Adults (WWK9)

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WWK refers to the What We Know series of information sheets on ADHD. See the complete list. See the PDF version of this sheet.

Individuals wishing to seek an evaluation for ADHD should use this information and resource sheet as a set of guidelines for what to expect from the clinician conducting the evaluation.

This What We Know sheet will describe:

  • the common symptoms of ADHD in adults
  • how professionals evaluate adults for possible ADHD
  • what to expect when consulting a professional for an ADHD evaluation

What is ADHD?

Attention-deficit/hyperactivity disorder (ADHD) is a common neurobiological condition affecting 5-8 percent of school age children,1,2,3,4,5,6,7 with symptoms persisting into adulthood in as many as 60 percent of cases (i.e. approximately 4% of adults). 8,9

In most cases, ADHD is thought to be inherited, and tends to run in some families more than others. ADHD is a lifespan condition that affects children, adolescents, and adults of all ages. It affects both males and females, and people of all races and cultural backgrounds.

Some common symptoms and problems of living with ADHD include:

  • Poor attention; excessive distractibility
  • Physical restlessness or hyperactivity
  • Excessive impulsivity; saying or doing things without thinking
  • Excessive and chronic procrastination
  • Difficulty getting started on tasks
  • Difficulty completing tasks
  • Frequently losing things
  • Poor organization, planning, and time management skills
  • Excessive forgetfulness

Not every person with ADHD displays all of the symptoms, nor does every person with ADHD experience the symptoms of ADHD to the same level of severity or impairment. Some people have mild ADHD, while others have severe ADHD, resulting in significant impairments. ADHD can cause problems in school, in jobs and careers, at home, in family and other relationships, and with tasks of daily living.

ADHD is thought to be a biological condition, most often inherited, that affects certain types of brain functioning. There is no cure for ADHD. When properly diagnosed and treated, ADHD can be well managed, leading to increased satisfaction in life and significant improvements in daily functioning. Many individuals with ADHD lead highly successful and happy lives. An accurate diagnosis is the first step in learning to effectively manage ADHD.

How is ADHD diagnosed?

There is no single medical, physical, or genetic test for ADHD. However, a diagnostic evaluation can be provided by a qualified mental health care professional or physician who gathers information from multiple sources. These include ADHD symptom checklists, standardized behavior rating scales, a detailed history of past and current functioning, and information obtained from family members or significant others who know the person well. ADHD cannot be diagnosed accurately just from brief office observations, or just by talking to the person. The person may not always exhibit the symptoms of ADHD in the office, and the diagnostician needs to take a thorough history of the individual's life. A diagnosis of ADHD must include consideration of the possible presence of co-occurring conditions.

Clinical guidelines for diagnosis of ADHD are provided in the American Psychiatric Association diagnostic manual commonly referred to as the DSM-IV-TR (Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision). These established guidelines are widely used in research and clinical practice. During an evaluation, the clinician will try to determine the extent to which these symptoms apply to the individual now and since childhood. The DSM-IV-TR symptoms for ADHD are listed below:

Symptoms of Inattention

  1. Often fails to give close attention to details or makes careless mistakes in schoolwork, work, or other activities
  2. Often has difficulty sustaining attention in tasks or play activities
  3. Often does not seem to listen when spoken to directly
  4. Often does not follow through on instructions and fails to finish schoolwork, chores, or duties in the workplace (not due to oppositional behavior or failure to understand instructions)
  5. Often has difficulty organizing tasks and activities
  6. Often avoids, dislikes, or is reluctant to engage in tasks that require sustained mental effort
  7. Often loses things necessary for tasks or activities
  8. Is often easily distracted by extraneous stimuli
  9. Is often forgetful in daily activities

Symptoms of Hyperactivity

  1. Often fidgets with hands or feet or squirms in seat
  2. Often leaves seat in classroom or in other situations in which remaining seated is expected
  3. Often runs about or climbs excessively in situations in which it is inappropriate (in adolescents or adults, may be limited to subjective feelings of restlessness)
  4. Often has difficulty playing or engaging in leisure activities quietly
  5. Is often "on the go" or often acts as if "driven by a motor"
  6. Often talks excessively

Symptoms of Impulsivity

  1. Often blurts out answers before questions have been completed
  2. Often has difficulty awaiting turn
  3. Often interrupts or intrudes on others (e.g., butts into conversations or games)

A diagnosis of ADHD is determined by the clinician based on the number and severity of symptoms, the duration of symptoms, and the degree to which these symptoms cause impairment in various life domains (e.g. school, work, home). It is possible to meet diagnostic criteria for ADHD without any symptoms of hyperactivity and impulsivity. The clinician must further determine if these symptoms are caused by other conditions, or are influenced by co-existing conditions.

It is important to note that the presence of significant impairment in at least two major settings of the person's life is central to the diagnosis of ADHD. Impairment refers to how ADHD interferes with an individual's life. Examples of impairment include losing a job because of ADHD symptoms, experiencing excessive conflict and distress in a marriage, getting into financial trouble because of impulsive spending or failure to pay bills in a timely manner, or getting on academic probation in college due to failing grades. If the individual manifests a number of ADHD symptoms but does not manifest significant impairment, s/he may not meet the criteria for ADHD as a clinical disorder.

The DSM-IV TR specifies three major subtypes of ADHD:

  1. Primarily Inattentive Subtype. The individual mainly has difficulties with attention, organization, and follow-through.
  2. Primarily Hyperactive/Impulsive. The individual mainly has difficulties with impulse control, restlessness, and self-control.
  3. Combined Subtype. The individual has symptoms of inattention, impulsivity, and restlessness.

Internet Self-Rating Scales

There are many Internet sites about ADHD that offer various types of questionnaires and lists of symptoms. These questionnaires are not standardized or scientifically validated and should never be used to self-diagnose or to diagnose others with ADHD. A valid diagnosis can only be provided by a qualified, licensed professional.

Who is qualified to diagnose ADHD?

For adults, an ADHD diagnostic evaluation should be provided by a licensed mental health professional or a physician. These professionals include clinical psychologists, physicians (psychiatrist, neurologist, family doctor, or other type of physician), or clinical social workers.

Whichever type of professional the individual may choose, it is important to ask about their training and experience in working with adults with ADHD. Many times the professional's level of knowledge and expertise about adult ADHD is more important for obtaining an accurate diagnosis and effective treatment plan than the type of professional degree. Qualified professionals are usually willing to provide information about their training and experience with adults with ADHD. Reluctance to provide such information in response to reasonable requests should be regarded with suspicion and may be an indicator that the individual should seek out a different professional.

How do I find a professional qualified to diagnose ADHD?

Ask your personal physician for a referral to a health care professional in your community who is qualified to perform ADHD evaluations for adults. It may also be helpful to call a university-based hospital, a medical school, or a graduate school in psychology in your area. If there is an ADHD support group in your area, it may be very helpful to go there and talk with the people attending the group. Chances are that many of them have worked with one or more professionals in your community and can provide information about them.

How do I know if I need an evaluation for ADHD?

Most adults who seek an evaluation for ADHD experience significant problems in one or more areas of living. Some of the most common problems include:

  • Inconsistent performance in jobs or careers; losing or quitting jobs frequently
  • A history of academic and/or career underachievement
  • Poor ability to manage day-to-day responsibilities (e.g., completing household chores or maintenance tasks, paying bills, organizing things)
  • Relationship problems due to not completing tasks, forgetting important things, or getting upset easily over minor things
  • Chronic stress and worry due to failure to accomplish goals and meet responsibilities
  • Chronic and intense feelings of frustration, guilt, or blame

A qualified professional can determine if these problems are due to ADHD, some other cause, or a combination of causes. Although some ADHD symptoms are evident since early childhood, some individuals may not experience significant problems until later in life. Some very bright and talented individuals, for example, are able to compensate for their ADHD symptoms and do not experience significant problems until high school, college, or in pursuit of their career. In other cases, parents may have provided a highly protective, structured and supportive environment, minimizing the impact of ADHD symptoms until the individual has begun to live independently as a young adult.

How should I prepare for the evaluation?

Most people are a little nervous and apprehensive about being evaluated for any type of condition such as ADHD. This is normal and should not stop anyone from seeking an evaluation if s/he is having significant problems in life and ADHD is suspected. Unfortunately, some of the common misperceptions about ADHD (e.g., it only occurs in children, or the person is just looking for an excuse) make many people reluctant to seek help.

Many professionals find it helpful to review old report cards and other school records, dating back to kindergarten or even the preschool years. If such records are available, they should be brought to the first appointment. Copies of reports from any previous psychological testing should also be brought to the appointment. For adults who experience problems in the workplace, job evaluations should be brought for review if available.

Many professionals will ask the individual to complete and return questionnaires before the evaluation, and to identify a significant other who will also participate in parts of the evaluation. Timely completion and return of the questionnaires will expedite the evaluation.

What is a comprehensive evaluation?

Although different clinicians will vary somewhat in their procedures and testing materials, certain protocols are considered essential for a comprehensive evaluation. These include a thorough diagnostic interview, information from independent sources such as the spouse or other family members, DSM-IV symptom checklists, standardized behavior rating scales for ADHD, and other types of psychometric testing as deemed necessary by the clinician. These are discussed in more detail below.

The Diagnostic Interview: ADHD Symptoms

The single most important part of a comprehensive ADHD evaluation is a structured or semi-structured interview, which provides a detailed history of the individual. In a "structured" or "semi-structured" interview, the interviewer asks a pre-determined, standardized set of questions, in order to increase reliability and decrease the chances that a different interviewer would come up with different conclusions. This allows the clinician to cover a broad range of topics, discuss relevant issues in more detail, and ask follow up questions while ensuring coverage of the domains of interest. The examiner will review the diagnostic criteria for ADHD and determine how many of them apply to the individual, both at the present time and since childhood. The interviewer will further determine the extent to which these ADHD symptoms are interfering with the individual's life.

The Diagnostic Interview: Screening for Other Psychiatric Disorders

The examiner will also conduct a detailed review of other psychiatric disorders that may resemble ADHD or commonly co-exist with ADHD. ADHD rarely occurs alone. In fact, research has shown that many people with ADHD have one or more co-existing conditions. The most common include depression, anxiety disorders, learning disabilities, and substance use disorders. Many of these conditions mimic some ADHD symptoms, and may, in fact, be mistaken for ADHD. A comprehensive evaluation includes some interviewing to screen for co-existing conditions. When one or more co-existing conditions are present along with ADHD, it is essential that all are diagnosed and treated. Failure to treat co-existing conditions often leads to failure in treating the ADHD. And, crucially, when the ADHD symptoms are a secondary consequence of depression, anxiety, or some other psychiatric disorder, failure to detect this will result in incorrectly treating the individual for ADHD. Other times, treating the ADHD will eliminate the other disorder and the need to treat it independently of ADHD.

The examiner is also likely to ask questions about the person's health history, developmental history going back to early childhood, academic history, work history, family and marital history, and social history.

Participation of a Significant Other

It is also essential for the clinician to interview one or more independent sources, usually a significant other (spouse, family member, parent, partner) who knows the person well. This procedure is not to question the person's honesty, but rather to gather additional information. Many adults with ADHD have a spotty or poor memory of their past, particularly from childhood. They may recall specific details, but forget diagnoses they were given or problems they encountered. Thus, the clinician may request that the individual being evaluated have his or her parents fill out a retrospective ADHD profile describing childhood behavior.

Many adults with ADHD may also have a limited awareness of how ADHD-related behaviors cause problems for them and have impact on others. In the case of married or cohabitating couples, it is to the couple's advantage for the clinician to interview them together when reviewing the ADHD symptoms. This procedure helps the non-ADHD spouse or partner develop an accurate understanding and an empathetic attitude concerning the impact of ADHD symptoms on the relationship, setting the stage for improving the relationship after the diagnostic process has been completed.

Finally, it should be noted that many adults with ADHD feel deeply frustrated and embarrassed by the ongoing problems caused by their ADHD. It is very important that the person being evaluated discuss these problems openly and honestly, and not hold back information due to feelings of shame or fear of criticism. The quality of the evaluation, and the accuracy of the diagnosis and treatment recommendations, will be largely determined by the accuracy of the information provided to the examiner.

Standardized Behavior Rating Scales

A comprehensive evaluation includes the administration of one or more standardized behavior rating scales. One of the rating scales may be a checklist of the DSM-IV-TR ADHD symptoms reviewed earlier in this information and resource sheet. These are questionnaires based on research comparing behaviors of people with ADHD to those of people without ADHD. Scores on the rating scales are not considered diagnostic by themselves, but serve as an important source of objective information in the evaluation process. Most clinicians ask the individual undergoing the evaluation and the individual's significant other to complete these rating scales.

Psychometric Testing

Depending on the individual and the problems being addressed, additional psychological, neuropsychological, or learning disabilities testing may be used as needed. These do not diagnose ADHD directly but can provide important information about ways in which ADHD affects the individual. The testing can also help determine the presence and effects of co-existing conditions. For example, in order to determine whether the individual has a learning disability, the clinician will usually give a test of intellectual ability as well as a test of academic achievement.

Medical Examination

If the individual being evaluated has not had a recent physical exam (within 6-12 months), a medical examination is recommended to rule out medical causes for symptoms. Some medical conditions (e.g., thyroid problems, seizure disorders) can cause symptoms that resemble ADHD symptoms. A medical examination does not "rule in" ADHD but is extremely important in helping to "rule out" other conditions or problems.


Towards the end of the evaluation the clinician will integrate the information that has been collected through diverse sources, complete a written summary or report and provide the individual and family with diagnostic opinions concerning ADHD as well as any other psychiatric disorders or learning disabilities that may have been identified during the course of the assessment.The clinician will then review treatment options and assist the individual in planning a course of appropriate medical and psychosocial intervention. Afterwards, the clinician will communicate with the individual's primary care providers, as deemed necessary.

Suggested Reading

American Psychiatric Association: Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision. Washington, DC, American Psychiatric Association, 2000.

Brown, T.E. (Ed.) (2000). Attention-Deficit Disorders and Comorbidities in Children, Adolescents, and Adults. Washington, DC: American Psychiatric Press.

Goldstein, S., & Teeter Ellison, A. (Eds.) (2002). Clinician's guide to adult AD/HD: Assessment and intervention. New York: Academic Press.

Murphy, K.R., & Gordon, M. (1998). Assessment of adults with AD/HD. In Barkley, R. (Ed.) Attention-Deficit Hyperactivity Disorder: A handbook for diagnosis and treatment. (pp. 345-369). New York: Guilford Press.


1. American Psychiatric Association (2000). Diagnostic and statistical manual of mental disorders: DSM IV (4th ed., text, revision), Washington, D.C.: American Psychiatric Association.

2. Mayo Clinic. (2002). How Common is Attention-Deficit/Hyperactivity Disorder? Archives of Pediatrics and Adolescent Medicine 156(3): 209-210.

3. Mayo Clinic (2001). Utilization and Costs of Medical Care for Children and Adolescents with and without Attention-Deficit/Hyperactivity Disorder. Journal of the American Medical Association 285(1): 60-66.

4. Surgeon General of the United States (1999). Mental Health: A Report of the Surgeon General. Rockville, MD: U.S. Department of Health and Human Services.

5. American Academy of Pediatrics (2000). Clinical practice guidelines: Diagnosis and evaluation of the child with attention-deficit/hyperactivity disorder. Pediatrics, 105, 1158-1170.

6. Centers for Disease Control and Prevention (2003). Prevalence of diagnosis and medication treatment for attention-deficit/hyperactivity disorder.  Morbidity and Mortality Weekly Report 54: 842-847.

7. Froehlich, T.E., Lanphear, B.P., Epstein, J.N., et al. Prevalence, recognition, and treatment of attention-deficit/hyperactivity disorder in a national sample of US children. Archives of Pediatric and Adolescent Medicine (2007), 161:857-864.

8. Faraone, S.V., Biederman, J., & Mick, E. (2006) The age-dependent decline of attention-deficit hyperactivity disorder:  A meta-analysis of follow-up studies. Psychol Med (2006), 36: 159-65.

9. Kessler, R.C., Adler, L., Barkley, R., Biederman, J., et al. The prevalence and correlates of adult ADHD in the United States:  Results from the National Comorbidity Survey Replication.  Am Journal of Psychiatry (2006), 163:724-732.

The information provided in this information and resource sheet was supported by Cooperative Agreement Number The information provided in this information and resource sheet was supported by Cooperative Agreement Number 5U38DD000335-03 from the Centers for Disease Control and Prevention (CDC).  The contents are solely the responsibility of the authors and do not necessarily represent the official views of CDC. It was approved by CHADD's Professional Advisory Board in May 2003.

2003 Children and Adults with Attention-Deficit/Hyperactivity Disorder (CHADD).

Updated March 2008

For further information about ADHD or CHADD, please contact:

National Resource Center on ADHD Children and Adults
with Attention-Deficit/Hyperactivity Disorder

4601 Presidents Drive, Suite 300
Lanham, MD 20706

Please also visit the CHADD Web site at

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