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How long does a dyslexia assessment take?

5 minute read · updated October 28, 2026

19 sources: 2 government or law, 3 university, 1 peer-reviewed research, 13 charity or professional body

Usually a few hours of testing, with a written report weeks later. BDA sessions run up to about three hours, Dyslexia Ireland says about one to two hours with a report within four weeks, and a US guide describes six to eight hours over two or three sessions.[1][2][3]

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Time is measured in three parts: getting ready, the session, and waiting for the report. The figures below are the ones that assessment providers and guides publish themselves. Your own assessor's timings may be different, so ask before you book.

Published session lengths

Session and report times stated by each source (read October 2026)
Source and regionSession lengthReport
British Dyslexia Association, UKUsually up to three hours[1]No fixed time given; the assessor needs time to score and analyze results first[1]
British Dyslexia Association remote assessment, UKUsually 2 to 4 hours, with breaks[4]Assessor has 15 working days to write it; the BDA emails it within a further 5 working days[4]
Dyslexia Scotland guidance for adults (February 2024)Usually around 2 hours[5]Not stated[5]
Dyslexia Ireland, IrelandApproximately one to two hours[2]Brief verbal feedback on the day; written report within four weeks[2]
Queen Mary University of London disability service, UKAround three hours, done remotely[6]Not stated[6]
LD OnLine guide to adult LD and ADHD assessment, United StatesUsually six to eight hours, often over two or three sessions[3]Not stated[3]

The US guide describes a broader evaluation, with tests of intellectual or cognitive ability, information processing and current achievement, and it is written for assessments of learning disabilities and ADHD.[3] US university documentation guidelines ask for the same three areas, and the University of Pennsylvania says a diagnosis should not rest on any single test or subtest, which is one reason US evaluations run longer.[7][8] NICHD, the US federal research institute on reading, describes providers using a series of tests of memory, spelling, visual perception and reading.[9] A UK specialist teacher assessment focuses on the areas set out in the SASC report format, such as reading, spelling, writing, phonological processing, memory and processing speed.[10][11]

What makes an assessment longer or shorter

  • What is being assessed. An assessment that also looks at attention, maths or handwriting needs more tests. UK guidance says specific learning difficulties can overlap and assessors should refer on when another practitioner is needed.[10]
  • Who does it. The BDA says a psychologist may be engaged where needs are more complex or several conditions may be involved.[12]
  • How you are on the day. The SASC report format asks assessors to record health, attention, anxiety and fatigue during testing.[10] Tell the assessor if you are unwell or very tired.
  • Online or in person. In the UK, SASC remote assessment guidance applies from October 2026, and some tests may only be used remotely where the publisher allows it.[13] A 2017 review of 12 adult studies found verbal tests gave similar results by video and in person, but it covered general cognitive tests, not dyslexia assessments.[14]

Time before the session

Some preparation is needed before the appointment. Book an eye test first if your last one was more than two years ago, which is the BDA's rule for adults, and consider a hearing check, which it calls helpful.[1] It explains that unchecked vision problems can leave an assessment without a clear outcome.[15] If you need an eye test first, book it early.

The SASC report format asks assessors to record your schooling, language history and health.[10] If your assessor sends a background form before the day, allow time to fill it in carefully. Preparing for an assessor lists documents worth gathering.

Waiting times

Few providers publish waiting times, and those that do give no date for them. When read in October 2026, the BDA said remote appointments are usually available within one month, while in-person assessors often book months in advance.[16] Waits change with demand and region, so ask each assessor for their next date and how soon the report follows. The Learning Disabilities Association of America also suggests asking how long the assessment itself will take.[17]

Quick answers

Can a dyslexia assessment be done in one day?

Often, yes. The BDA and Dyslexia Ireland both describe single sessions of up to three hours or less.[1][2] A US guide says broader evaluations are often split over two or three sessions.[3]

How long does it take to get the report?

Dyslexia Ireland says its written report is sent within four weeks.[2] For BDA remote assessments, the assessor has 15 working days to write the report and the BDA sends it within a further 5 working days.[4]

Will I get results on the day?

You may hear initial thoughts. The BDA says the assessor may share them but needs time to analyze results before reaching a diagnosis.[1]

Should I take breaks during a long assessment?

Ask the assessor at the start. UK assessors are asked to note fatigue and anxiety during testing, because they can affect results.[10]

Review status

Source-checked, not expert-reviewed

Drafted with AI assistance. Each factual claim was checked against the source it links to on 2026-10-28. No clinician, psychologist or dyslexia specialist has reviewed this page. See the claims register.

Sources

  1. [1]Assessments: before, during and after. British Dyslexia Association. Accessed 2026-10-28. Charity or professional body
  2. [2]Assessment. Dyslexia Ireland. Accessed 2026-10-28. Charity or professional body
  3. [3]Assessment of adults with LD and/or AD/HD. Kathleen Ross Kidder, LD OnLine (WETA). Accessed 2026-10-28. Charity or professional body
  4. [4]What to expect from a remote online assessment. British Dyslexia Association. Accessed 2026-10-28. Charity or professional body
  5. [5]Dyslexia assessments for adults. Dyslexia Scotland, 2024. Accessed 2026-10-28. Charity or professional body
  6. [6]Specific learning differences: frequently asked questions. Disability and Dyslexia Service, Queen Mary University of London. Accessed 2026-10-29. University
  7. [7]Learning disabilities documentation guidelines. Weingarten Center, University of Pennsylvania. Accessed 2026-10-29. University
  8. [8]Documentation guidelines for learning disabilities. Services to Students with Disabilities, California State University, San Bernardino, 2022. Accessed 2026-10-29. University
  9. [9]How are reading disorders diagnosed?. Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health, 2020. Accessed 2026-10-29. Government or law
  10. [10]Diagnostic Assessment Report for Specific Learning Difficulties (report format, no comments version). SpLD Assessment Standards Committee (SASC), 2025. Accessed 2026-10-28. Charity or professional body
  11. [11]List of Suitable Tests for the Assessment of Specific Learning Difficulties (revised June 2024). SpLD Test Evaluation Committee (STEC) of SASC, 2024. Accessed 2026-10-28. Charity or professional body
  12. [12]What is the difference between a psychologist assessment and a specialist teacher assessment?. British Dyslexia Association. Accessed 2026-10-28. Charity or professional body
  13. [13]New SASC guidance on the use of remote assessment in the identification of SpLD. SpLD Assessment Standards Committee (SASC), 2026. Accessed 2026-10-28. Charity or professional body
  14. [14]Neuropsychological test administration by videoconference: a systematic review and meta-analysis. Brearly TW, Shura RD, Martindale SL, et al. Neuropsychology Review 27(2):174-186, 2017. Accessed 2026-10-29. Peer-reviewed research
  15. [15]Why do I need to ensure the person being assessed has had an eyesight test before the assessment?. British Dyslexia Association. Accessed 2026-10-28. Charity or professional body
  16. [16]Types of assessments. British Dyslexia Association. Accessed 2026-10-28. Charity or professional body
  17. [17]The adult learning disability assessment process. Learning Disabilities Association of America. Accessed 2026-10-28. Charity or professional body
  18. [18]Disabled Students' Allowance (DSA). GOV.UK. Accessed 2026-10-28. Government or law
  19. [19]Dyslexia friendly workplaces: a guide for employers. British Dyslexia Association, 2023. Accessed 2026-10-28. Charity or professional body

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