IQCODE - Short Form

The IQCODE, an acronym for "Informant Questionnaire on Cognitive Decline in the Elderly," is a widely used screening tool to assess cognitive deterioration in older adults. Unlike tests administered directly to the patient, such as the Mini-Mental State Examination (MMSE), the IQCODE is a questionnaire completed by an informant, such as a close relative, caregiver, or friend, who has known the patient for at least 10 years. The questionnaire's central premise is to assess the *change* in cognitive functioning over time, rather than measuring current performance in isolation. This approach is particularly useful as it minimizes biases caused by the individual's prior educational level or baseline intelligence. The questionnaire, which exists in a long form (26 items) and a more common short form (16 items), asks the informant to compare the older person's current ability to perform everyday tasks (like remembering recent conversations, managing their money, learning to use a new gadget, or remembering the day and month) with their performance on those same tasks 10 years ago. Responses are given on a 5-point Likert scale, ranging from "Much Better" (1) to "Much Worse" (5), with "No Change" (3) as the neutral point. The final result is the average of the item scores, resulting in a score between 1 and 5. An average score of 3 indicates no perceived change, while scores above 3 (with specific cutoff points, such as 3.22 or 3.45, often used) suggest significant cognitive decline, indicating the need for a more in-depth diagnostic evaluation for conditions like Mild Cognitive Impairment or dementia.