A blood test that could predict the onset of Alzheimer's poses ethical challenges, an expert from the Alzheimer's Society has said.
A new study published in the journal Nature Medicine found that changes in the blood may predict whether someone will develop Alzheimer's.
"Having such a test would be an interesting development, but it also throws up ethical considerations," Dr Doug Brown, the charity's director of research and development, said.
"If this does develop in the future people must be given a choice about whether they would want to know, and fully understand the implications.
Dr Brown said there needed to be larger studies with different populations before it could be turned into a blood test for Alzheimer's disease.
More top news
Theresa May outlined her objectives for Brexit negotiations on Tuesday, but what did people from both sides of the referendum make of it?
Milder Atlantic air into the north with colder, Continental air into the south.
A report produced for the British government criticised the security at the Riu Imperial Marhaba hotel where 38 people were killed in 2015.