A simple test requiring just a pen and paper could reveal if someone close to you has dementia - before having been diagnosed.
A doctor specializing in the degenerative disease has taken to his YouTube channel to share the scientifically proven, yet 'easy-to-administer', exam that can be done in less than a minute - although it may take longer for someone suffering with the condition.
That specialist is Dr Miguel Rivera, who for almost two decades has been working with dementia patients - which tragically included his own dad.
"In July 2018 I lost my dad to Lewy Body dementia, he was 86 years old. My experience as a dementia doctor did not quite prepare me for the difficult experience of being a dementia caregiver," Rivera shares on his website.
Adding: "This was, without a doubt, one of the most difficult experiences of my life. We are all together in this!"
Yes, we certainly are - so, let's delve into the simple 'pen and paper' test.
Speaking to his followers on YouTube, River said: "Are you concerned about your loved one having cognitive problems? Well, there is a simple easy-to-administer screening test that you can do at home that has even been scientifically validated... and this is the clock drawing test.
"This simple test checks many important cognitive functions including short-term memory, language skills, visual spatial awareness and executive function - and the instructions are very simple.
"Number one, tell your loved one draw a clock. Number two, put all the numbers in it. Number three, set the time to 10 minutes past 11. Any major deviations from this should be discussed with your doctor."
He added: "You can also check online there is lots of good information on the clock drawing test."
According to Very Wealth Health, it measures several cognitive abilities at once, including attention, hearing comprehension, visual memory, and motor skills.
Just like Rivera mentioned, Alzheimer's sufferers are asked to draw a clock with hands pointing to a specific time to gauge their mental capacity.
The drawing is then scored - which can be done in several different ways - but usually there are points awarded based on the sequence of numbers, placement of numbers, and the placement of the hands.
If you've been affected by dementia or Alzheimer's and would like to speak with someone in confidence, contact the Alzheimer's Association via 800.272.3900 open 24 hours seven days a week.