4AT Calculator for Delirium Screening
Rapid 4AT delirium assessment across alertness, AMT4, attention and acute change. Automatic totalling and interpretation, in around two minutes. Use it online, or download the app to score offline on shift.
Why Use a Digital 4AT Calculator?
The 4AT is one of the quickest, most reliable ways to screen for delirium — but only if it is completed consistently and scored correctly. A digital calculator keeps the four items in front of you, applies the scoring rules automatically, and maps the total straight to its interpretation, so a busy assessment of a confused older patient still produces a clear, defensible result.
Two-Minute Screen
All four items completed quickly, with no special training and no separate scoring sheet to carry.
Clear Interpretation
The total maps straight to possible delirium, possible cognitive impairment, or unlikely — no lookup needed.
A Defensible Record
The screen and its result feed into the patient record, giving the receiving team a clear cognitive baseline.
The Four 4AT Items
SnapMedic scores each item with the correct rules and totals to the 4AT score (out of 12) automatically.
Alertness
Score 0 or 4
Normal, or clearly abnormal (drowsy or agitated)
AMT4
Score 0–2
Age, date of birth, place, and current year
Attention
Score 0–2
Months of the year listed backwards
Acute Change
Score 0 or 4
Acute change or fluctuating course in mental status
Interpreting the 4AT total
Possible delirium ± cognitive impairment
Possible cognitive impairment
Delirium / cognitive impairment unlikely
4AT Calculator Features
Everything you need for a quick, consistent delirium screen, built into one free app.
Rapid Two-Minute Screen
Walk through all four 4AT items in around two minutes, no special training required, with the total and interpretation calculated automatically.
Clear Interpretation
The total maps to its meaning (possible delirium at 4+, possible cognitive impairment at 1–3, unlikely at 0), so the result is unambiguous.
Offline Operation
Works without any internet connection. All scoring runs locally on your device, so it stays reliable in care homes, rural areas and anywhere with no signal.
Designed for the Older Patient
A structured delirium screen that fits naturally into the assessment of frailty, falls and confusion in older adults.
Fast, Gloved-Hand Entry
Large touch targets and clear prompts make the screen quick and accurate, even under pressure with gloves on.
Add to the Patient Record
4AT scoring integrates with SnapMedic's observation logging, feeding the result and interpretation into the patient encounter timeline.
How SnapMedic Compares
See how SnapMedic's 4AT calculator stacks up against other assessment tools.
| Feature | SnapMedic | Others |
|---|---|---|
| Full 4AT (all four items) | Most | |
| Automatic interpretation | Some | |
| Integrated observation logging | Rare | |
| Works offline | Varies | |
| Android support | Some iOS only | |
| Free to use | Some paid | |
| Built by UK paramedics | Varies |
Feature availability in other apps may vary by version and platform.
Frequently Asked Questions
Common questions about SnapMedic's 4AT delirium calculator.
Download the Free 4AT Calculator
Join thousands of UK paramedics using SnapMedic for fast, structured assessment. Free on iOS, Android, and web.