Katz ADL Scoring: How to Read the Results

A number on a form is not a care plan

A new coordinator finishes an intake assessment, writes a "4" at the bottom of the Katz form, and moves on to the next client. Three weeks later, a family member asks what the number means. Six months after that, a state licensing surveyor asks a harder question: how did that score translate into the support hours and tasks written into the plan of care? If the honest answer is "the coordinator just remembered," the plan has a documentation problem, not a scoring problem.

The Katz Index of Independence in Activities of Daily Living is simple to administer and easy to misread. The scoring itself takes minutes. Turning that score into a defensible, dated part of a client's plan — one a family can understand and a surveyor can trace — is where most small agencies and independent practices lose the thread. This article walks through how Katz ADL scoring actually works, the mistakes that quietly undermine it, and how to record results so the number means something six months from now, not just today.

What the six functions measure

The Katz Index, published by Sidney Katz and colleagues in 1963, scores six basic self-care functions: bathing, dressing, toileting, transferring, continence, and feeding. Katz is also credited with coining the term "activities of daily living" itself, back in 1950 — this is the framework the entire field's vocabulary grew out of.

Each function is scored independently, not blended into a single vague impression. A client can be fully independent in feeding while needing full assistance with bathing, and a good Katz ADL scoring record shows that difference rather than averaging it away. That granularity is the entire point: it tells a caregiver or family member exactly where support is needed and where it isn't.

Scoring each function correctly

The Hartford Institute for Geriatric Nursing (HIGN) publishes the Katz "Try This" instrument for reproduction in not-for-profit educational and clinical use, provided it's attributed to HIGN — which is part of why it's become a common backbone for care plans that need a defensible, non-proprietary functional assessment.

For each of the six functions, the assessor records whether the client performs the function independently (no supervision, direction, or physical assistance), performs it with some assistance, or is dependent on someone else to perform it. The scoring mistake most agencies make here is treating "some difficulty" as automatically equal to "dependent." Katz ADL scoring draws a real line between needing supervision or cueing and needing physical hands-on assistance — and that line matters enormously for staffing and cost, so it deserves a genuine, function-by-function judgment rather than a shortcut.

Reading the total: what 6, 4, and 2 actually mean

Once each of the six functions is scored, the results roll up into a total. Per HIGN's published interpretation: a score of 6 indicates full function, a score of 4 indicates moderate impairment, and a score of 2 or below indicates severe functional impairment.

A single Katz total answers "how much support, overall" — it does not answer "support with what." The six individual function scores answer that.

This is the single most common misreading of Katz ADL scoring: treating the total as the deliverable. A "4" tells a family that support needs are moderate. It tells a coordinator nothing about whether to staff a caregiver for morning transfers, evening dressing, or overnight continence care. The total is a useful shorthand for tracking change over time — is this client's function declining, holding steady, improving after a health event — but the actual care plan has to be built from the six underlying scores, not the sum.

Common Katz ADL scoring mistakes

A few patterns show up repeatedly in small agencies and independent geriatric care management practices:

• Scoring from memory instead of observation. A caregiver's general impression of a client ("she does pretty well on her own") is not the same as watching or asking specifically about each of the six functions. Katz ADL scoring is only as reliable as the specificity of the questions asked.
• Letting family optimism or client pride skew the answer. Clients and family members sometimes describe function as better than it is, either out of pride or because they haven't watched closely enough. A good assessor asks about a recent, specific instance rather than a general self-assessment.
• Recording the score once and never again. A Katz score taken at intake and never revisited stops being useful the moment the client's condition changes — which, for most home care and geriatric care management clients, is a matter of when, not if.
• Losing the date the score was recorded. Without a timestamp, there's no way to show a licensing reviewer, a family, or a new caregiver when a support level changed and what triggered it.

From score to support plan: making it defensible

The difference between a Katz score sitting on a form and a Katz score doing real work in a care plan comes down to three things: the six function scores are recorded individually and specifically, the assessment is timestamped, and each new assessment is preserved rather than overwritten.

That third point is where a lot of documentation quietly fails. When an updated Katz score replaces the old one in the same Word file — no version history, no record of what the score used to be — an agency loses the ability to show change over time, which is often exactly what a licensing reviewer or a family member wants to see: did the client's transferring ability decline after a fall, and did the support plan change in response. CareWorkbook's plan builder creates a dated, immutable snapshot each time a plan is finalized, so a prior Katz score and its date stay on the record rather than disappearing under the next update.

None of this requires clinical software or a proprietary license. A licensing surveyor or a family member reading a Katz-based plan of care is reading a public-domain instrument, applied consistently and dated honestly — that's the whole bar.

Where Katz stops and IADL picks up

Katz ADL scoring covers basic self-care — the functions someone needs to survive independently day to day. It does not cover the more complex, instrumental tasks that determine whether someone can live independently in a community setting: managing medication, handling finances, using the telephone, or getting to appointments. Those fall under the Lawton-Brody Instrumental Activities of Daily Living scale, a separate framework that pairs naturally with Katz in a full functional assessment.

A client can score a full 6 on Katz — fully independent in basic self-care — and still be unsafe living alone because of a low IADL score on medication management or finances. Reading Katz in isolation, without its IADL counterpart, is one more way an otherwise correct score gets misapplied to a support plan.

For a closer look at how Katz's six functions map to real scoring, see how the Katz Index breaks down function by function, and for the instrumental side of the picture, read how to interpret Lawton IADL scores. For the broader picture of how ADL and IADL results come together into one plan, the ADL/IADL assessment guide and functional assessment for care planning walk through the full process end to end.

A structured, timestamped version of both scales — built for exactly this kind of scoring, dating, and version tracking — is available in the ADL/IADL Assessment Pack, ready to drop into a plan of care rather than reconstructed from scratch for every client.