in the blood

She believed that had she had a CA125 blood test earlier - CA125 is a protein in the blood and can be raised in women with some types of ovarian cancer - she might have been diagnosed sooner.

High potassium levels in the blood can point to serious health issues, such as heart problems.

There can also be an associated increase in potassium found in the blood stream, which further poisons the heart.

Her team is looking at how the presence of certain proteins in the blood could indicate the likelihood of future inflammation in the brain.

Changes in the blood could be present decades before the onset of physical symptoms and they were usually only picked up by scans, which took longer to carry out and required specialist equipment.