Initial screening tools available for assessing cognition and delirium
| Confusion assessment method (CAM) | Abbreviated mental test-4 (AMT-4) | Abbreviated mental test-10 (AMT-10) | 4 As test (4AT) | ||||
|---|---|---|---|---|---|---|---|
| Acute onset and fluctuating course | Age | 1 | Age | 1 | Alertness | Normal, mild sleepiness for <10 seconds on walking | 0 |
| Inattention | Date of birth | 1 | Time | 1 | Clearly abnormal | 4 | |
| Disorganised thinking | Place | 1 | Address to recall | 1 | AMT-4 | No mistakes | 0 |
| Altered level of consciousness | Year | 1 | Year | 1 | 1 mistake | 1 | |
| Location | 1 | ≥2 mistakes or untestable | 2 | ||||
| Recognition of two persons | 1 | Attention, listing months in reverse order | ≥7 months correctly | 0 | |||
| Date of birth | 1 | <7 months correct or refuses to start | 1 | ||||
| Year that World War II started | 1 | Untestable | 2 | ||||
| Present monarch | 1 | Acute change or fluctuating course | No | 0 | |||
| Counting backwards from 20–1 | 1 | Yes | 4 | ||||