Are standard IQ tests enough for ADHD-dyslexia screening? 

While IQ tests for ADHD dyslexia screening can provide useful information about cognitive strengths and weaknesses, they are not sufficient on their own for accurate diagnosis. These tests measure general intellectual ability but do not directly assess the specific skills affected by ADHD or dyslexia. The ADHD dyslexia IQ test adequacy debate centres on the fact that both conditions can exist across the full IQ range, making targeted assessments essential. 

In dyslexia, reading, spelling, and phonological processing are key areas of difficulty. ADHD primarily impacts attention regulation, organisation, and impulse control. Standard IQ testing does not evaluate these specific functions in detail, so relying on it alone can result in missed diagnoses. This is why IQ testing learning disorders is often paired with specialist literacy and attention assessments. 

Why IQ Tests Are Only Part of the Picture 

For some individuals, strong general intelligence can mask specific learning difficulties, while in others, ADHD-related inattention can lower IQ test performance without reflecting true ability. These limitations mean IQ tests dyslexia ADHD diagnosis should always be part of a broader evaluation. A full profile requires academic testing, behavioural assessments, and in some cases, memory and processing speed measures. In most cases, IQ tests for ADHD dyslexia screening are a starting point, not the conclusion. 

Additional Assessments to Include 

Literacy testing  

Evaluates reading fluency, comprehension, and spelling accuracy. 

Attention and executive function assessments  

Measures focus, working memory, and planning skills. 

Processing speed evaluations  

Identifies whether slow cognitive processing is affecting performance. 

Visit providers like ADHD Certify for personal consultations that combine IQ testing with targeted ADHD and dyslexia assessments. 

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Learning disabilities (e.g., dyslexia).