Bedside IQ Assessment
There is no validated bedside cognitive screening test that can accurately estimate a patient's IQ. The cognitive screening tools available (Mini-Cog, MoCA, MMSE, etc.) are designed to detect cognitive impairment, dementia, or mild cognitive impairment—not to measure intelligence quotient 1.
Critical Distinction: Cognitive Screening vs. IQ Testing
The evidence provided focuses entirely on cognitive impairment screening tools, which assess whether brain function has declined from baseline. These tools evaluate:
- Memory deficits
- Executive dysfunction
- Language impairment
- Visuospatial problems
- Attention deficits
These are fundamentally different from IQ testing, which measures intellectual capacity and requires:
- Standardized administration by trained psychologists
- Formal neuropsychological batteries (e.g., WAIS-IV, Stanford-Binet)
- 60-90+ minutes of testing time
- Normative comparison data
What You Can Do at the Bedside
For Estimating Premorbid IQ (Pre-Injury Intelligence):
The Wechsler Test of Adult Reading (WTAR) is the only tool mentioned in the evidence that relates to IQ estimation 2. It:
- Measures word pronunciation ability
- Shows high stability even after traumatic brain injury
- Correlates with premorbid intellectual functioning
- Requires the patient to read English fluently
- Takes approximately 10-15 minutes
Important caveat: The WTAR estimates what someone's IQ was before injury/illness, not current cognitive status. It's validated specifically for traumatic brain injury populations 2.
For Detecting Cognitive Impairment (Not IQ):
If your actual goal is to assess current cognitive function rather than IQ, the 2025 Alzheimer's Association guidelines recommend 1:
Quick screening (2-4 minutes):
- Mini-Cog: 3-word recall + clock drawing
- Sensitivity: 76%, Specificity: 89%
- Best for rapid dementia screening
Comprehensive screening (10-15 minutes):
- Montreal Cognitive Assessment (MoCA):
- Assesses multiple domains (memory, attention, executive function, language, visuospatial)
- Sensitivity: 90%, Specificity: 87%
- More accurate than MMSE for detecting mild cognitive impairment
- Use MoCA-B version for patients with <4 years education
- Free online training and certification available
- Provides domain-specific index scores
Common Pitfalls
Confusing cognitive screening with IQ testing: Scoring 26/30 on MoCA indicates possible cognitive impairment, not an IQ of 87. These are unrelated metrics.
Using MMSE: Has copyright restrictions and is less sensitive for mild cognitive impairment than alternatives 1, 3.
Ignoring education level: All cognitive screening tools are affected by educational attainment. Low scores may reflect limited education rather than pathology 1, 3.
Single-time assessment: Cognitive screening scores must be interpreted with comprehensive history, functional assessment, and serial monitoring 3.
Bottom Line
If you need actual IQ estimation, refer for formal neuropsychological testing. Bedside cognitive screening tools cannot and should not be used to estimate IQ—they serve an entirely different clinical purpose of detecting pathological cognitive decline.