BADLS stands for the Bristol Activities of Daily Living Scale, a 20-item questionnaire that a carer fills in to describe how well a person with dementia manages everyday activities. It is not a memory test, and it is not a blood test. It is a structured way of recording what someone can still do — make a hot drink, get dressed, find their way around a familiar street — and how that changes over months and years. If a memory clinic has handed you this form, or you have met the acronym in a research paper, you are in the right place.
In this guide you’ll learn what the 20 items cover, how the 0 to 60 scoring works and which way the numbers run, who is meant to complete the form, where the scale came from, what recent research says about how well it holds up, and how it sits alongside the blood tests that usually form part of a dementia assessment.
What the BADLS actually measures
The BADLS measures dependency in everyday life. Each of its 20 items asks about one ordinary activity, and the carer picks the statement that best matches what the person has actually been doing over the past couple of weeks — not what they could manage on a good day, and not what they used to be able to do.
The distinction matters more than it sounds. A person can score well on a clinic memory test and still be unable to work out how to use the washing machine they have owned for fifteen years. The reverse happens too. Cognitive tests and function tests answer different questions, and the BADLS was built to answer the second one: how much help does this person need, right now, to get through an ordinary day?
Two things the scale deliberately does not do are worth naming. It does not diagnose dementia — a low or high score is not a diagnosis of anything. And it does not measure quality of life. Someone can need a great deal of help and still be content; someone can be largely independent and miserable. The BADLS is narrower than either of those, and that narrowness is what makes it useful.
How this differs from the general idea of daily living activities
“Activities of daily living” is a broad clinical concept covering the whole family of self-care and household tasks, measured by many different tools across many different conditions — stroke rehabilitation, frailty, post-surgical recovery. BloodSense explains that general concept, along with tools such as the Katz Index and the Barthel Index, in a separate guide to activities of daily living. This page stays on one specific instrument: the Bristol scale, built for dementia, completed by a carer.
How the BADLS is scored
Each of the 20 items offers a short ladder of statements describing decreasing ability, from doing the activity independently through to being unable to do it at all. The carer selects one statement per item. Those selections convert to points, and the points add up.
Higher scores mean more dependency. This trips people up, because many health scores run the other way — on the Mini-Mental State Examination, for instance, a higher number is better. On the BADLS, a rising score over time means a person is managing less, not more. The total runs from 0 to 60, and this scoring structure is documented in the assessment appendices of published UK dementia trials on the NIHR Journals Library.
| Response level | Roughly what the carer is describing | Points |
|---|---|---|
| First option | Does the activity independently, without prompting or supervision | 0 |
| Second option | Manages, but needs reminding, prompting or a little help | 1 |
| Third option | Needs substantial help, or manages only part of the activity | 2 |
| Fourth option | Fully dependent, or no longer able to do the activity | 3 |
| Not applicable | Activity not done for reasons unconnected to dementia | 0 |
| Total across 20 items | 0 means fully independent throughout; 60 means fully dependent throughout | 0–60 |
One detail carries real weight for carers. The wording of the statements is written separately for every item — the four options under “shopping” are not the same sentences as the four under “dressing”. They were drafted with carers, in the language carers actually use. That is a deliberate design choice, and it is why the form takes a little longer to read than a generic tick-box grid.
The “not applicable” option exists to stop the scale from punishing people for things that have nothing to do with their dementia. If someone never cooked in their life, or gave up driving twenty years ago for reasons of eyesight, that is not functional decline, and it scores zero rather than three.
The 20 activities the BADLS covers
The 20 items span basic self-care and the more complex tasks that independent community living demands. Grouping them makes the coverage easier to see, though the questionnaire itself does not use these headings.
| Area of daily life | Activities covered |
|---|---|
| Food and drink | Preparing food, eating, preparing a drink, drinking |
| Personal care | Dressing, hygiene, teeth, bathing or showering, using the toilet |
| Getting about | Transfers (such as chair to standing), mobility |
| Orientation and contact | Orientation to time, orientation to place, communication, using the telephone |
| Home and community | Housework or gardening, shopping, handling money and finances, using transport |
| Leisure | Games and hobbies |
Look at that list as a carer and the logic becomes obvious. It covers the things that go wrong first in dementia — the telephone, the money, the bus route, the recipe — alongside the things that go wrong much later, such as eating and toileting. That spread is why the same form can follow a person across years rather than being replaced at each stage.
The full questionnaire, with its exact item wording, is a copyrighted instrument. It is not reproduced here. Clinics and researchers obtain it through the original publication or through the licensing routes the authors maintain, and your memory service will supply the form if it uses one.
Who completes the BADLS, and how it works in practice
A carer completes it — a spouse, an adult child, a close friend, a care home key worker. Someone who sees the person’s ordinary days. In research papers this person is called the informant, and in trial protocols, the study companion. The scale is explicitly not self-completed by the person with dementia, and it is not filled in by a clinician working from a ten-minute appointment.
That design is a strength and a limitation at once. A carer knows things no clinic visit can reveal. A carer is also tired, emotionally involved, and sometimes seeing a version of the person that visitors never see. Two carers of the same person can produce different totals, and neither is lying.
In practice, it takes most carers ten to twenty minutes. Some clinics have the carer fill it in alone; others walk through it as a conversation. It is usually repeated at intervals — often every six or twelve months in ordinary care, more often in a trial — because a single score in isolation says much less than the direction of travel between two scores.
Answering it honestly is harder than it looks
Carers often report a pull toward generosity: recording what a person could do if they were having a good week, or if you left them enough time. The scale asks for what is actually happening. Under-reporting difficulty is understandable — it can feel like a betrayal to write down that someone can no longer manage their own bank card — but it makes the form less useful to the team trying to arrange support.
What BADLS scores mean, and what they don’t
There is no official cut-off that separates “fine” from “not fine”. The scale was not built as a screening threshold, and treating a single total as a verdict misreads it. A total of 12 means something different for a 58-year-old with early-onset dementia living alone than for an 88-year-old with a devoted spouse at home.
What the number does well is track change. A score that climbs from 14 to 24 over a year is a concrete, documented statement that someone needs materially more help than they did — the sort of statement that moves care packages, benefits assessments and family conversations along. It is also useful for spotting patterns: if the points are concentrated in shopping, finances and transport while personal care is untouched, that shapes very different support from the reverse.
Related dementia assessments answer other questions. Clinicians record orientation and alertness using the A&O orientation assessment, and in acute settings a person’s conscious level may be documented with the Glasgow Coma Scale. None of these substitutes for the others.
Where the BADLS came from
The scale was developed in Bristol, in the United Kingdom, and published in 1996 in the journal Age and Ageing by Romola Bucks and colleagues, working out of the Department of Care of the Elderly at Frenchay Hospital. The original paper describes it exactly as it still operates: a carer-rated instrument of 20 daily-living abilities.
The reason it was built is the reason it endures. Existing daily-living scales had been designed for physically frail older people or for rehabilitation after injury, and they were insensitive to what dementia actually does — they asked whether a person could physically lift a kettle, not whether they could still work out that the kettle was the thing you needed. The Bristol team went to carers first, asked which activities mattered, and used the carers’ own descriptions of ability as the response options.
Thirty years on, that origin story explains the scale’s reach. It has been translated and revalidated in multiple languages, and it appears throughout dementia research as a way of measuring whether an intervention helps people live their lives, rather than merely improving a test score.
Where blood tests fit into a dementia assessment
The BADLS describes function. It says nothing about cause — and cause matters, because a minority of people with memory or functional decline have something contributing to it that can be treated.
This is standard practice rather than wishful thinking. The US National Institute on Aging notes that in assessing Alzheimer’s disease, doctors order blood, urine, and other standard medical tests to help identify other possible causes, and that some of those conditions may be treatable and possibly reversible. The UK’s NHS makes the same point, listing an underactive thyroid among the causes of memory problems that a GP will look for.
In practice a dementia workup commonly includes a vitamin B12 blood test, since deficiency can produce cognitive and neurological symptoms, and thyroid checks centred on a TSH thyroid function test. Some services additionally measure homocysteine blood levels, which rise when B12 or folate is low. None of these tests diagnoses or rules out dementia. They are there to catch the treatable contributors, so that nothing fixable gets missed while everyone concentrates on the harder diagnosis.
Latest scientific advances
Research on the BADLS over the past few years has been less about reinventing it and more about testing whether it holds up — in new languages, in new populations, and against the newer drugs now reaching dementia clinics.
The scale keeps passing its checks in new languages
A Japanese version was developed and validated in 2025, and an Arabic version in 2022, the latter co-authored by Romola Bucks, who wrote the original. Both reported the same broad picture: the 20 items behave as though they are measuring one underlying thing rather than twenty unrelated ones, carers asked again a few weeks later give closely similar answers, and BADLS totals move in the expected direction against cognitive tests — as thinking scores fall, dependency scores rise.
Both teams also had to adapt items rather than translate them word for word. The Japanese team modified the questions on eating utensils and money handling, because a scale written around cutlery and pound notes does not transfer cleanly. That is a useful reminder that the BADLS measures culture-bound habits, not biology.
What this means for you: the number your clinic writes down is not arbitrary. It is reasonably stable, and it tracks something real. But “reasonably stable” is not the same as precise. A two-point wobble between visits is noise. A ten-point climb is a signal. Judge the trend, not the digit.
An aside on the jargon: when papers report internal consistency, or Cronbach’s alpha, they are asking whether the questions hang together as a set — a value near 1 means they do. Test-retest reliability asks whether the same rater gives the same answer twice in a row. Both came out high for these versions.
Everyday function is now a standard endpoint in dementia drug trials
Modern dementia trials almost always include a daily-living scale alongside the memory tests, because the question families and regulators care about is whether a drug helps a person keep doing things. In the Clarity AD trial of lecanemab, an anti-amyloid antibody, results published in 2026 for the ApoE ε4 non-carrier and heterozygote group showed that daily-living outcomes moved consistently with the trial’s main clinical measure, alongside a reduction in amyloid on brain scans. That trial used a US-developed cousin of the Bristol scale rather than the BADLS itself, but the family of instruments is the same.
Function scales also return negative answers, which is exactly why they earn their place. The ELAD trial of liraglutide — a diabetes drug that had shown promise in animal models — reported its phase 2b results in Nature Medicine in 2025 and found no significant difference between drug and placebo on its daily-living measure.
What this means for you: this whole family of scales exists so that “does it actually help daily life?” is a question with an answer rather than a hope. If your relative is offered a trial, the daily-living questionnaire you are asked to complete is not paperwork. It is often the outcome that matters most, and you are the instrument.
An aside on the jargon: an outcome measure is simply the yardstick a trial agreed to use before it started, so that results cannot be judged by whichever measure happened to look best afterwards.
Where the scale is weaker
A critical evaluation co-authored by Bucks flagged the honest limits: the BADLS was designed for people with mild dementia living in the community, with carers who see them regularly. Push it outside that setting and it strains. In advanced dementia in a care home, most items sit at the dependent end and the scale has little room left to detect change — researchers call that a ceiling effect. Later work reassessing it among nursing home residents with advanced dementia found the reliability broadly held up, but the underlying structure was less consistent than in the original community sample.
What this means for you: if you are caring for someone in the later stages and the score barely moves, that is a property of the ruler, not evidence that nothing is changing. Say so to the team. Your description will carry information the total has stopped carrying.
Glossary of key terms
| Term | Definition |
|---|---|
| BADLS | Bristol Activities of Daily Living Scale. A 20-item questionnaire, completed by a carer, measuring how much help a person with dementia needs with everyday activities. |
| Informant | The person who answers questions about someone else’s abilities. On the BADLS this is the carer. Trial protocols sometimes call this person the study companion. |
| Activities of daily living (ADL) | The general clinical term for everyday self-care and household tasks. The BADLS is one specific tool for measuring them in dementia. |
| Instrumental activities of daily living (IADL) | The more complex tasks independent living needs, such as shopping, managing money and using transport. Several BADLS items fall into this category. |
| Outcome measure | The yardstick a clinical trial commits to in advance for judging whether a treatment worked. |
| Internal consistency | A statistical check, often reported as Cronbach’s alpha, of whether a questionnaire’s items are measuring one shared underlying thing. |
| Test-retest reliability | Whether the same rater, assessing the same unchanged person twice, produces a similar score both times. |
| Ceiling effect | What happens when a scale runs out of room. If almost every item is already at maximum dependency, further decline cannot register. |
| Mini-Mental State Examination (MMSE) | A widely used 30-point cognitive test. It scores in the opposite direction to the BADLS, so a lower MMSE and a higher BADLS both indicate more difficulty. |
| Functional decline | A measurable reduction over time in someone’s ability to carry out everyday activities. |
Frequently asked questions
Is BADLS the same thing as basic activities of daily living?
No, and this is a genuine source of confusion. In some American clinical writing, “BADLs” is used as shorthand for basic activities of daily living — the core self-care tasks such as bathing and dressing — usually contrasted with IADLs, the instrumental ones like cooking and banking. The Bristol Activities of Daily Living Scale is a different thing entirely: a named, published questionnaire from the UK. Both abbreviate to the same five letters. If you are reading a document and are unsure which is meant, look at whether the text refers to a category of tasks or to a specific form with a score out of 60.
Where can I find the BADLS questionnaire as a PDF?
The BADLS is a copyrighted instrument, so it is not something to lift from a random download. Copies circulate online, but versions of unclear provenance can be altered or incomplete, which matters if scores are being compared over time. The reliable routes are the original 1996 publication in Age and Ageing, or the licensing channels the authors maintain. If a clinician has asked you to complete it, ask them for the copy they use — that way your answers sit in the same record as everything else.
What counts as a bad BADLS score?
There is no threshold that makes a score good or bad, and the scale was never designed to provide one. Scores run from 0, meaning independent across all 20 activities, to 60, meaning fully dependent across all of them. What clinicians look at is your relative’s own trend and the pattern across items, interpreted alongside their living situation, their support and everything else in the assessment. If a number worries you, the useful move is to ask the team what they read into it rather than to look for a cut-off online.
Do I need training to complete it?
No. It was designed with carers, deliberately, so that no training would be needed — the response options use everyday descriptions rather than clinical language. Most people take ten to twenty minutes. The one thing worth knowing before you start is that it asks about the recent past, typically the last couple of weeks, and about what is actually happening rather than what is possible on a good day. If an item genuinely does not apply for reasons unrelated to dementia, use the not-applicable option rather than guessing.
My relative’s other carer scored it differently. Who is right?
Possibly both of you. Different carers see different hours, different tasks and sometimes a noticeably different person — many people with dementia rally for visitors and relax with whoever is there every day. Disagreement is not a failure of the form; it is information. Tell the clinical team that your answers differ and where. That conversation often surfaces more than the totals do, and it also helps the team decide whose answers to use consistently going forward, since comparing scores over time works best when the same person completes it each round.
How often will we be asked to do this?
It varies. In routine care, repeating it every six to twelve months is common, or whenever something changes noticeably. In a research study, the schedule is fixed in advance and often more frequent. Because a single score means much less than the movement between two, the repeats are where the value sits. If a long time has passed and nobody has asked again, it is reasonable to raise it — particularly if you have noticed changes that have not yet made it into anyone’s notes.
Sources
- Bucks RS, Ashworth DL, Wilcock GK, Siegfried K — Assessment of activities of daily living in dementia: development of the Bristol Activities of Daily Living Scale — Age and Ageing, 1996 — https://doi.org/10.1093/ageing/25.2.113
- Bucks RS, Haworth J — Bristol Activities of Daily Living Scale: a critical evaluation — Expert Review of Neurotherapeutics, 2002 — https://doi.org/10.1586/14737175.2.5.669
- Maeshima S et al. — Development and validation of the Japanese version of the Bristol Activities of Daily Living Scale for Dementia and Mild Cognitive Impairment Assessment — Geriatrics & Gerontology International, 2025 — https://doi.org/10.1111/ggi.70101
- Alkeridy WA, Al Khalifah RA, Mohammedin AS, Khallaf R, Muayqil T, Bucks RS — The Arabic Translation and Cross-Cultural Adaptation of the Bristol Activity of Daily Living Scale — Journal of Alzheimer’s Disease, 2022 — https://doi.org/10.3233/JAD-215489
- Boyd PA, Wilks SE, Geiger JR — Activities of Daily Living Assessment among Nursing Home Residents with Advanced Dementia: Psychometric Reevaluation of the Bristol Activities of Daily Living Scale — Health & Social Work, 2018 — https://doi.org/10.1093/hsw/hly010
- Perry R et al. — Lecanemab for treatment of individuals with early Alzheimer’s disease who are apolipoprotein E ε4 non-carriers or heterozygotes — The Journal of Prevention of Alzheimer’s Disease, 2026 — https://doi.org/10.1016/j.tjpad.2026.100507
- Edison P et al. — Liraglutide in mild to moderate Alzheimer’s disease: a phase 2b clinical trial (ELAD) — Nature Medicine, 2025 — https://doi.org/10.1038/s41591-025-04106-7
- Kehoe PG, Turner N, Howden B, et al. — Details of cognitive assessments, measures of daily life and quality of life (RADAR RCT, Appendix 1) — NIHR Journals Library / NCBI Bookshelf, 2021 — https://www.ncbi.nlm.nih.gov/books/NBK575016/
- National Institute on Aging (NIH) — How Is Alzheimer’s Disease Diagnosed? — https://www.nia.nih.gov/health/alzheimers-symptoms-and-diagnosis/how-alzheimers-disease-diagnosed
- NHS (UK) — How to get a dementia diagnosis — https://www.nhs.uk/conditions/dementia/symptoms-and-diagnosis/diagnosis/
Further reading
- ADL meaning: activities of daily living
- A&O meaning: orientation assessment
- GCS meaning: the Glasgow Coma Scale
- Vitamin B12: understanding your levels
- A plain-English guide to lab results
Understand your lab results with BloodSense
Get your results interpreted in minutes
A dementia assessment usually includes blood tests, not to diagnose dementia but to check for treatable things that can affect memory and daily functioning — most commonly thyroid function (TSH) and vitamin B12, sometimes folate or homocysteine. If you are holding a set of those results and the numbers mean nothing to you, BloodSense explains what each one is and what the ranges refer to, in plain language. It does not diagnose anything and does not replace your doctor or the memory clinic. It is simply there to help you walk into the next appointment understanding the paperwork.
