How to Score the Adult ADHD Self-Report Scale (ASRS-v1.1)

The ASRS-v1.1 uses a two-part structure, and most people only need to score Part A, the six-item screener. You look at each of the six questions, check whether your answer falls in the shaded zone on the form, and count how many shaded responses you have. Four or more shaded responses out of six means the screen is positive, suggesting further evaluation for ADHD is warranted. The full 18-item checklist adds more detail but is scored differently and serves a different purpose, which is where most of the confusion starts.

What the ASRS-v1.1 Actually Contains

The Adult ADHD Self-Report Scale version 1.1 is an 18-item questionnaire developed by the World Health Organization as a screening tool for attention-deficit/hyperactivity disorder in adults.¹ It is split into two sections. Part A contains six items and functions as the quick screener. Part B contains the remaining twelve items, which provide a fuller picture of symptom frequency.² Together, the 18 items map onto the 18 diagnostic criteria for ADHD in the DSM-IV, with nine covering inattention and nine covering hyperactivity and impulsivity.³

Each item asks how often you have experienced a particular symptom over the past six months, and the response options are the same across all 18 items: Never, Rarely, Sometimes, Often, and Very Often. That uniformity makes the form look simple. The scoring, however, is not just a matter of adding up numbers.

Scoring Part A Step by Step

Part A is the section most clinicians and researchers use as the primary screen. Here is how to score it:

On the official printed form, each of the six questions has a row of five response boxes. Some of those boxes are shaded (usually in gray or dark coloring), and others are left white. The shading is the key to everything. If you checked a box that falls in the shaded zone for that particular question, that item counts as a positive response. If your check mark is in the white zone, the item does not count.

Once you have gone through all six items, count the number of positive (shaded) responses. A score of four or more out of six is considered a positive screen.⁴ That result does not diagnose ADHD. It means the person’s symptom pattern is consistent enough with ADHD that a full clinical evaluation is the reasonable next step.

If you score three or fewer shaded responses, the screen is negative. That does not rule out ADHD entirely, but it suggests the six most predictive symptoms are not present at a frequency that typically indicates the disorder.

Why the Shaded Cutoffs Are Not the Same for Every Question

This is the part that trips people up. You might assume that “Often” or “Very Often” is always what counts as a positive response, but the shaded zone shifts depending on the question. For some items, the shading begins at “Sometimes.” For others, it does not kick in until “Often” or “Very Often.” The designers set these thresholds based on which frequency level best distinguishes adults with ADHD from those without it for each specific symptom.

For example, a question about difficulty wrapping up final details of a project might have its shaded zone starting at “Sometimes,” because even moderate frequency of that behavior is unusual enough to be meaningful. A question about fidgeting or squirming might not shade until “Often,” because a fair number of people without ADHD fidget sometimes. The variable cutoffs are the reason you cannot simply assign a number to each response (like 0 for Never and 4 for Very Often), add them up, and compare against a single total. That common approach produces a different score than the one the screener was actually validated to use.

If you are filling out the form digitally and there is no visible shading, you need to look up the specific cutoff for each item. The original WHO scoring guide specifies which response level marks the threshold for each of the six questions. Without that information, you are guessing, and your result may not match what the screener is designed to detect.

What Part B Adds to the Picture

Part B’s twelve items are not scored using the same shaded-box method. Instead, these items are typically used by clinicians to get a broader view of symptom frequency and to guide the diagnostic conversation. Some practitioners review Part B responses qualitatively, looking for patterns across the inattention and hyperactivity-impulsivity domains. Others use a summed frequency score across all 18 items (both Part A and Part B together) to track symptom severity over time or to compare against population norms.

The distinction matters because the validated screening cutoff of four out of six applies only to Part A. Part B does not have its own validated positive/negative threshold in the same way. Its role is supplementary. If Part A is the smoke detector, Part B is the inspection that follows the alarm. A clinician reviewing Part B responses can see which specific symptoms are most frequent, whether the pattern leans more toward inattention or hyperactivity-impulsivity, and how pervasive the difficulties are across different types of daily functioning.

For research purposes, some studies use the total score across all 18 items to establish population norms and characterize symptom burden. In that context, each response gets a numerical value from 0 (Never) to 4 (Very Often), and the numbers are summed. That total can range from 0 to 72. But this summed score serves a different purpose than the Part A screener and should not be confused with it.

How Accurate the Screener Is

The six-item Part A screener performs well as a first-pass filter. In a study comparing its ability to distinguish adults with ADHD from those without, the screener showed strong discriminative accuracy, and the full ASRS performed similarly.⁵ Separate research has confirmed the screener as a valid and reliable instrument for identifying ADHD symptoms in adults.⁶

One thing worth noting is that the six-item screener and the full 18-item ASRS produce similar accuracy in distinguishing people with and without ADHD. That might seem counterintuitive, since the full version has three times as many questions. The reason is that the six Part A items were specifically chosen because they are the most predictive of the entire set. Adding the other twelve items contributes more detail about the symptom profile but does not dramatically improve the yes-or-no screening decision. This is why most clinical guidelines recommend starting with Part A alone rather than asking patients to complete the full form just for screening purposes.

Common Scoring Mistakes

The most frequent error is treating the ASRS like a simple Likert scale. People assign point values to each response, sum the total, and then look for an arbitrary cutoff like “if your score is above 36, you probably have ADHD.” No validated threshold exists for that kind of raw total as a screening decision. The screener was designed around the shaded-box method for Part A, and that is the method that has been tested against clinical diagnoses. A summed score across all 18 items has some utility for tracking symptom burden, but it was not the basis for the screening validation studies.

A second common mistake is treating Part B responses as equally weighted to Part A responses when making a screening determination. Someone might score only two shaded responses on Part A but have very high-frequency answers on several Part B items, then conclude they probably have ADHD because the “overall picture looks bad.” Part A was selected to be the screener precisely because its six items carry the most diagnostic weight. Part B items are useful for clinical context but are not designed to override a negative Part A screen on their own.

A third mistake is ignoring the six-month timeframe. The instructions specify that you should rate how often each symptom has occurred over the past six months. People going through a stressful period, dealing with sleep deprivation, or managing another condition like anxiety or depression can endorse many of these items at high frequencies without having ADHD. The six-month window is meant to capture a stable pattern, not a temporary spike. If your life circumstances changed dramatically in the past few months, your responses may reflect that situation rather than a neurodevelopmental condition.

What a Positive Screen Does Not Tell You

A positive result on Part A means you endorsed four or more of the six most predictive ADHD symptoms at a frequency that exceeds what is typical in the general population. It does not mean you have ADHD. The ASRS is a screener, not a diagnostic tool. The difference is not just a technicality. ADHD diagnosis requires evidence that symptoms were present in childhood, that they cause impairment in at least two settings (like work and home), and that they are not better explained by another condition.

Several other conditions produce symptoms that overlap heavily with ADHD on self-report measures. Anxiety can cause difficulty concentrating and restlessness. Depression can cause inattention, forgetfulness, and difficulty completing tasks. Sleep disorders notoriously mimic ADHD across almost every symptom domain. Even thyroid dysfunction can produce concentration problems and hyperactive feelings. A screener cannot distinguish between these possibilities. Its job is to flag people who should receive a thorough evaluation, and the evaluation is where the actual diagnostic work happens.

Conversely, a negative screen does not guarantee you do not have ADHD. Some adults have developed strong compensatory strategies that mask their symptoms on self-report measures. Others may underreport because they have normalized their difficulties over decades and do not recognize them as unusual. A clinician who suspects ADHD based on history and functioning may still pursue a full evaluation regardless of a negative ASRS screen.

Using the ASRS Outside Its Original Population

The ASRS-v1.1 was developed and primarily validated in adult populations. Some research has explored whether the six-item screener works in younger groups, with preliminary evidence supporting its reliability and validity in adolescents as well.⁶ That said, using the ASRS with populations it was not originally designed for requires caution. The threshold of four out of six was optimized for adults, and adolescents may endorse certain items at different baseline rates simply because of developmental differences in attention and impulsivity.

Cultural and language factors also matter. Translations of the ASRS exist in many languages, but the shaded-box thresholds were established using English-language samples in specific countries. Whether those same cutoffs perform equally well across different cultural contexts is an active area of research. If you are using a translated version, it is worth checking whether a validation study exists for that specific translation rather than assuming the original cutoffs transfer perfectly.

How Presentation Format Affects Results

An underappreciated issue is that the way the ASRS is presented to someone can influence how they respond. Research comparing different formats of the ASRS in primary care settings has examined whether the layout of the form itself changes screen-positive rates.⁴ The concern is straightforward: if the shaded boxes are clearly visible, respondents might anchor their answers to the visible threshold, consciously or not. If the shading is absent (as in many digital reproductions), people might respond differently because they are not primed by the visual layout.

For practical purposes, this means the version of the ASRS you use matters more than you might expect. A PDF downloaded from a reputable source with the original shading intact is not the same instrument as a plain-text online quiz that simply lists the questions and response options. If you want your result to be interpretable using the validated four-out-of-six cutoff, you need the version with the shading, or at minimum, a scoring key that specifies the cutoff response for each item. Many online ADHD self-tests are loosely based on the ASRS questions but use their own scoring systems. Results from those versions cannot be directly compared to published research on the ASRS-v1.1.

If you are a clinician administering the screener, the official WHO version is freely available and includes the scoring key. Using the standardized form ensures that the screening result is comparable to what was used in validation studies. If you are an individual who took an online version and wants to know whether to pursue evaluation, the most reliable approach is to obtain the official form, fill it out following the instructions, and bring the completed screener to your appointment. That gives your provider a structured starting point rather than a number from an unvalidated website.