Test Methodology

This page details the scientific methodology behind the ASRS-18 ADHD Test, including the scale used, score calculation, limitations, validated population, and what the test does not do.

Understanding the methodology is essential to correctly interpret results and recognize the limitations of this screening tool.

What Scale Do We Use?

We use the ASRS-v1.1 (Adult ADHD Self-Report Scale), developed by the World Health Organization's (WHO) Workgroup on Adult ADHD, led by researchers from Harvard Medical School, including Ronald C. Kessler.

Why was ASRS-18 chosen?

High sensitivity (correctly detects positive cases) and specificity (avoids false positives)

How is the Score Calculated?

The ASRS-18 test is divided into two parts with different weights in interpretation:

Part A (6 Questions)

Focuses on the most predictive ADHD symptoms. Each response is scored from 0 (Never) to 4 (Very Often). Maximum score is 24 points.

Part B (12 Questions)

Assesses complementary symptoms of inattention, hyperactivity, and impulsivity. Also scored 0 to 4 per question, with a maximum of 48 points.