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CDT Open
Detect Signs of Early Dementia From Home

The Clock Draw Test (CDT) is a simple but effective way to detect dementia and traumatic brain injury. CDT Open does NOT diagnose dementia, but is meant to be a Computerized Cognitive Assessment Aid (CCAA) that gives indication about whether someone's cognitive abilities are intact -- even dehydration can cause someone to draw an abnormal clock. All you have to do is draw a clock showing "10 minutes past 11" using pen and paper! Then take a picture of this clock and upload it to Shape Genie. CDT Open is FREE, because we believe in health equity. Each person can request one clock analysis per month.

Video [12 min]: An Objective & Quantitative Clock Draw Test
When to Start Screening for Dementia?

Routine screening for signs of dementia should start around 55 years of age, especially for those who suffer from high blood pressure, diabetes, chronic pain, or had traumatic brain injury. Don't be caught off guard by dementia! Those who have no family history of it, yet who have the above risk factors should be actively screening. Those who do have a family history of dementia should definitely be actively screening. At the least, every time this person visits a doctor or pharmacy for themselves and is 55+, they should do a clock draw test -- we made CDT Open free so that no one would have to pay for it. 

Instructions for Drawing a Clock
CDT Instructions.png

Future Translations of The Instructions

  • Arabic (عربي)

  • Hindi (हिंदी)

  • Farsi (فارسی, Zan Zendegi Azadi)

  • French (Français)

  • Mandarin (普通话)

  • Portuguese (Português)

  • Spanish (Español)

  • Urdu (اردو)

  • Vietnamese (Tiếng Việt)

What The Monthly Score Report Looks Like
Score Report page 1.png
How to Request a Clock Analysis

Hold Your Monthly Spots Now!

1. Draw your clock according to the above instructions.

2. Photograph your clock according to the above instructions.

3. Create a "Basic" account at, which is free.

4. After logging into your account, click "Upload" in the upper right hand corner of the window.

5. Type in the name of the person who drew the clock (all lowercase letters and hyphens, no spaces or special characters). Click "Submit".

Each person should have their own Basic account on Shape Genie. Do NOT add someone else's clock drawings to your account.

Video [3 min]: How to upload a clock image to hold monthly CDT Open spots 

Sign-up here to get updates on when CDT Open is available!

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