What is involved in a dyslexia diagnostic assessment?

Diagnosis of dyslexia is carried out by trained educational psychologists. It takes several hours and involves a series of 'psychometric' tests to measure spatial, verbal, memory, processing speed, reading and spelling abilities in a standardised way to compare with the normal range of these in children of that age. Someone with dyslexia shows a characteristic pattern of weaknesses and strengths in these abilities - a 'spikey' profile - that can easily be recognised with experience.

Nowadays a full diagnostic assessment is not often considered necessary because the 2013 Diagnostic and Statistical Manual of Mental Disorders (DSM5) no longer distinguishes dyslexia from other specific learning disorders (SLDs), so that precise diagnosis is said to carry no advantages now.