The ASRS-v1.1: A Clinician Guide to the Adult ADHD Self-Report Scale

The Adult ADHD Self-Report Scale, Version 1.1 (ASRS-v1.1) is an 18-item self-report screener developed with the World Health Organization to identify symptoms consistent with adult ADHD. Only the first six items - Part A - are validated for scoring; the remaining twelve, Part B, are never scored. This guide covers what the ASRS measures, precisely how Part A's shaded-cell threshold works, why Part B is excluded from the score, and how the ASRS compares with a child-focused instrument like the Vanderbilt.

What the ASRS-v1.1 measures

The ASRS-v1.1 was developed from the World Health Organization's Composite International Diagnostic Interview to screen adults aged 18 and over for symptoms consistent with ADHD. It takes about 5 minutes to complete. The full instrument has 18 items split into two parts, but only Part A - the first six items - functions as the validated screener.

Part A vs Part B: why only six items are scored

This is the detail clinicians most often get wrong with the ASRS. The instrument has 18 items in total, but Part A (items 1-6) is the validated screener, and Part B (items 7-18) is not scored at all. Part B items provide additional clinical detail that can support a conversation about symptom impact, but they carry no scoring weight and should not be summed into any total. If you see an ASRS report with a Part B total or cut-off attached to it, that is not the validated instrument - treat it as a red flag.

The Part A response scale and shaded-cell rule

Each of the 18 items is rated on a five-point frequency scale:

• 0 - Never
• 1 - Rarely
• 2 - Sometimes
• 3 - Often
• 4 - Very Often

Part A scoring does not simply add up the raw 0-4 values. Instead, each of the six Part A items has its own threshold response, at or above which the response falls in the instrument's "shaded" range and counts as one mark. The threshold is not the same for every item:

• Items 1-3 are marked when the response is Sometimes or higher (Sometimes, Often, or Very Often).
• Items 4-6 are marked when the response is Often or higher (Often or Very Often only - Sometimes does not count).

The Part A score is the count of items that land in this shaded range, giving a score from 0 to 6. This asymmetry - three items shading in from "Sometimes" and three shading in only from "Often" - is exactly the kind of item-by-item rule that the original paper form conveys through visual cell shading rather than a printed number, which makes it easy to misapply when scoring by hand and straightforward for software to apply identically every time.

ASRS-v1.1 cut-off and interpretation

The published scoring rule is 4 or more marks in Part A. A Part A score of four or higher indicates symptoms highly consistent with adult ADHD and warrants further investigation. No formal severity bands are published beyond this single threshold - the ASRS is a yes/no-style screen at heart, not a graded severity scale, so a score of 4 and a score of 6 both indicate the same thing: further clinical investigation is warranted. As with any screener, a positive Part A result is not a diagnosis - it signals that symptoms are consistent with adult ADHD and that a fuller diagnostic workup should follow.

Who completes it, age range, and time required

The ASRS-v1.1 is a self-report instrument completed by the adult patient, intended for adults aged 18 and older, and takes about 5 minutes including both parts of the form.

ASRS-v1.1 compared with the Vanderbilt

Clinicians who work across the lifespan will notice the ASRS and the Vanderbilt Parent Rating Scale look nothing alike, despite both screening for ADHD. The ASRS is deliberately minimal - just 6 scored items with a single "4 or more" threshold - reflecting its design purpose as a fast primary-care screen an adult can complete about themselves in a few minutes. The Vanderbilt is a 55-item parent-report form for children 6-12, screening ADHD subtypes plus co-morbid oppositional, conduct and anxiety/depression symptoms, gated by a functional-performance requirement. The difference in scale reflects the difference in what is being asked: an adult reporting on their own long-standing attention patterns versus a parent describing a child's behavior across home, school, and peer settings, where more granular subtype and co-morbidity information is clinically actionable.

Limitations

As a self-report measure, the ASRS depends on the individual's insight into their own attention and impulsivity patterns, which can be affected by mood, current stressors, or limited awareness of lifelong symptom patterns. Its brevity is also its constraint: six items screen efficiently but cannot capture the full symptom picture, functional impairment across settings, or childhood-onset history that a complete adult ADHD evaluation requires. A positive Part A score is the beginning of that evaluation, not its conclusion, and Part B - while useful as a talking point in a clinical interview - should never be treated as a scored addition to the result.

Using the ASRS-v1.1 digitally

A digital ASRS applies the correct per-item shaded-cell threshold automatically - Sometimes-or-higher for items 1-3, Often-or-higher for items 4-6 - so the Part A count is accurate without anyone needing to remember which three items use which threshold. It also keeps Part B visibly separate and unscored, preventing the common hand-scoring error of folding Part B responses into a total. Results integrate with a clinician-grade PDF report for use alongside a full diagnostic interview.

Key takeaways

• The ASRS-v1.1 has 18 items, but only Part A (items 1-6) is the validated, scored screener - Part B is never scored.
• Items 1-3 count as a mark from "Sometimes" upward; items 4-6 count as a mark only from "Often" upward.
• The Part A score is the count of marks, ranging from 0 to 6.
• A score of 4 or more marks indicates symptoms highly consistent with adult ADHD and warrants further investigation.
• The ASRS is a screening instrument, not a diagnosis, and carries no published severity bands beyond the single 4-mark threshold.