How Long Does ADHD Testing Take?

If you suspect someone of having ADHD, the earlier the diagnosis, the better. While symptoms of ADHD start showing in childhood, adults with ADHD usually are better at masking. However, there isn’t a singular or primary test to diagnose this condition, and the duration may also vary. Furthermore, while symptoms like inattention and hyperactivity are often apparent, a formal diagnosis requires a comprehensive evaluation process. Furthermore, the reason for this is that neurodivergent people often become proficient in masking their symptoms, which can make diagnosis challenging in some cases. That is why a crucial question for many seeking an ADHD diagnosis is: how long does ADHD testing take?

The article explores the different types of ADHD testing and how long they can take. As a result, by understanding the process, you can better prepare for evaluation and gain a clearer picture of the timeline.

Types of ADHD Testing

ADHD diagnosis relies on a comprehensive evaluation rather than a singular test. Here’s a closer look at some commonly used FDA-approved ADHD tests:

Test of Variables Attention (T.O.V.A)

TOVA stands for Test of Variables of Attention. It’s a computer-based neuropsychological assessment tool used to evaluate attention span and screen for ADHD. Here’s a breakdown of how it’s conducted:


  • TOVA is accessible on a computer screen, similar to a simple video game.
  • There are two main versions: visual and auditory. The visual version is more commonly used.


Instructions: The examiner will provide clear instructions about the task. You’ll be shown examples of target and non-target stimuli (usually letters or geometric shapes) and asked to respond (usually by pressing a button) only when you see the target stimuli.

The Test: The test consists of several short blocks with varying difficulty levels and takes nearly 20 minutes to complete. The difficulty can be manipulated by factors like:

Frequency of target stimuli: Sometimes targets appear more frequently, requiring sustained attention.

Distractors: Additional stimuli might be introduced to increase distraction and assess impulse control.

Monitoring: The examiner will monitor your performance throughout the test, recording your:

  • Response time: How quickly you respond to the target stimuli.
  • Accuracy: How many correct responses you make and how many errors you commit.
  • Omissions: Instances where you fail to respond to a target stimulus.


After the test, the software analyzes your response patterns and generates a report. This report compares your performance to established norms for your age group. It examines factors like:

Reaction time variability: Consistency in your response times.

Commission errors: Responding to non-target stimuli, indicating impulsivity.

Omission errors: Missing target stimuli, suggesting inattention.

Important Note:

TOVA is not a definitive diagnostic tool for ADHD, but it is helpful in establishing a baseline for further evaluation. That is why it’s used alongside a comprehensive evaluation, including clinical interviews and other standardized tests, to arrive at a diagnosis.

Additional Considerations:

Factors like fatigue, motivation, and practice effects (improved performance with repeated exposure) may influence the test’s effectiveness.

Psychological Testing

Psychological testing in ADHD assessment is another tool that is employed regularly. Additionally, it provides objective data that complements clinical interviews and helps paint a more comprehensive picture. These tests can:

Measure Attention and Processing Speed: Assessments like Continuous Performance Tests (CPTs) gauge an individual’s ability to sustain focus, ignore distractions, and react quickly to stimuli.

Assess Cognitive Abilities: Standardized tests help evaluate various cognitive domains, including verbal comprehension, working memory, and processing speed. This can help identify potential learning disabilities that might co-occur with ADHD.

Evaluate Executive Functioning: Executive functions are essential for planning, organizing, and regulating behavior. As a result, tests can assess skills like working memory, mental flexibility, and time management, which ADHD often impacts.

Types of Psychological Tests Used in ADHD Assessment:

Several psychological tests aid the evaluation of ADHD evaluations. Here are some common examples:

Computerized Continuous Performance Tests (CPTs): As mentioned earlier, CPTs measure attention and impulsivity by presenting visual or auditory stimuli on a computer screen. Individuals respond to target stimuli while inhibiting responses to non-target stimuli. Examples include the Conners Continuous Performance Test-III (CPT-III) and the Test of Variables of Attention (TOVA).

Standardized Achievement Tests: These tests assess academic skills like reading, math, and writing. While not specific to ADHD, they can identify potential learning disabilities that might contribute to academic difficulties often seen in individuals with ADHD.

Electroencephalogram (EEG)-Based Test: The Neuropsychiatric EEG-Based Assessment Aid (NEBA) System is the only FDA-approved EEG test for ADHD in children and adolescents. It measures brain wave activity to assess the ratio of theta and beta waves, which may be high in individuals with ADHD. However, it’s important to remember that the NEBA System works in conjunction with other evaluations and is not a standalone diagnostic tool.

The Procedure for Psychological Testing in ADHD Assessment:

The specific tests administered will depend on the individual’s age, symptoms, and the HCP’s evaluation strategy. Here’s a general breakdown of the procedure:

Consultation: The initial consultation with a qualified healthcare professional (HCP) like a psychologist or psychiatrist involves gathering information about your symptoms, developmental history, and any co-existing medical conditions.

Test Selection: Depending on the initial assessment, the HCP will determine which psychological tests are most appropriate for an individual.

Test Administration: A competent professional will administer the chosen tests, which they might conduct individually or on a computer. Furthermore, the testing environment is typically quiet and distraction-free to ensure accurate results.

Interpretation of Results: The HCP will analyze the test results along with other information from the evaluation, such as clinical interviews and rating scales. Moreover, they will consider how your performance compares to established norms for your age group.

Important Considerations:

  • Psychological testing can be time-consuming, lasting anywhere from 1 to 4 hours, depending on the number of tests administered.
  • The cost of testing can vary depending on the specific tests used, the HCP’s fees, and insurance coverage.
  • Some tests might require specialized training for administration and interpretation.

All in all, understanding the role and procedures involved in psychological testing for ADHD can give you valuable insight into this crucial component of the diagnostic process. Moreover, remember clear communication with your healthcare professional throughout the evaluation journey is essential to ensure a thorough and accurate diagnosis.


In conclusion, ADHD testing is a crucial step in understanding and managing this condition. However, while the timeline can vary, a thorough evaluation usually takes several appointments spread over a few weeks. Therefore, you can better prepare yourself for an ADHD evaluation by understanding the types of tests and their time duration.

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