An abnormal clock-drawing test—a brief cognitive screen using a scored clock drawing—can signal possible impairment, but it does not diagnose dementia. Ask how the result was scored, whether daily independence has changed, what else could explain the symptoms, and what evaluation should come next. The result is a reason to investigate, not a verdict. Its meaning depends on the scoring method, other test findings, reported changes, and the person's ability to manage daily life independently.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What does an abnormal result mean?
- How reliable is the score?
- Which questions clarify the result?
- Could another condition explain the symptoms?
- What should happen next?
What does an abnormal result mean?
The clock-drawing test checks for signs that a person may need a fuller cognitive assessment. It cannot confirm dementia or identify a dementia subtype by itself. The U.S.
Preventive Services Task Force classifies it as a brief screen. An abnormal result requires additional medical, laboratory, imaging, and/or neuropsychological evaluation before dementia can be confirmed, according to the USPSTF recommendation on cognitive impairment. The test may also appear within the three-minute Mini-Cog, which combines a scored clock drawing with memory recall. The Alzheimer's Association's cognitive-assessment guidance says clinicians use such screening results to decide whether a complete diagnostic assessment is needed.
How reliable is the score?
Ask which scoring system the clinician used. Different systems classify the same drawing in different ways, so a result such as "abnormal" or "failed" needs context. A 2018 meta-analysis covering 18 studies and 5,531 participants found that Shulman scoring had 82.0% sensitivity and 75.7% specificity. Sunderland scoring had 72.6% sensitivity and 87.9% specificity, according to the Journal of Advanced Nursing meta-analysis.
Sensitivity reflects how often a test detects people with the condition; specificity reflects how often it correctly clears people without it. Conventional paper scoring is especially limited when impairment is subtle. In a 2023 study of 310 community-dwelling older adults, two scoring scales had either low sensitivity of 0.59 or low specificity of 0.45. The researchers advised using clock scores within a broader cognitive battery rather than alone.
Which questions clarify the result?
Start by asking how the result fits with memory, language, thinking, neurologic findings, and reports from someone who knows the person well. An informant-based assessment uses observations from a family member, caregiver, or another knowledgeable person.
Useful questions include: The independence question matters because dementia involves cognitive decline that interferes with independent functioning. Mild cognitive impairment may cause noticeable changes without necessarily removing that independence. Tell the doctor what has changed, when it began, and whether the person now needs help with activities previously managed alone.
- What part of the drawing was considered abnormal?
- Which scoring system did you use?
- Did memory recall or another cognitive task also raise concern?
- Have thinking changes affected independent daily activities?
- What fuller cognitive, functional, neurologic, and informant-based assessment do you recommend?
Could another condition explain the symptoms?
Ask the doctor to consider health problems or substances that can resemble dementia. Some causes may be identifiable and often reversible with treatment, so they should not be overlooked after an abnormal screen.
Specifically ask about: The Alzheimer's Association's diagnosis guidance identifies these among the possible explanations clinicians may investigate. Ask which possibilities fit the person's symptoms and what evaluation is appropriate.
- Medication effects
- Depression
- Sleep apnea
- Delirium or infection
- Thyroid disease
What should happen next?
The next step should be based on the whole picture, not another clock drawing alone. No single brief cognitive tool is considered best, and someone who performs poorly on one should receive further evaluation or referral. For an older adult without recognized symptoms, routine cognitive screening is less clear.
The USPSTF found insufficient evidence to recommend either for or against screening people who have no recognized signs. That uncertainty does not apply when a patient, family member, caregiver, or clinician has noticed changes in memory, language, or other thinking abilities. In that situation, describe the observed changes and ask the clinician to arrange an appropriate diagnostic assessment.
