What This Means
This research suggests that a simple ratio calculated from two common blood test values — C-reactive protein (a marker of inflammation) divided by hemoglobin (a measure of red blood cell health) — may help predict stroke risk in middle-aged and older adults. The study followed over 6,700 people from China and England who had no history of stroke at the start, and found that those with higher CRP-to-hemoglobin ratios were significantly more likely to experience a stroke during follow-up. Specifically, people in the highest quarter of this ratio were about three times more likely to have a stroke compared to those in the lowest quarter.
The relationship between the ratio and stroke risk appeared to be roughly linear, meaning that as the ratio increased, stroke risk steadily increased as well, rather than only jumping at a certain threshold. This pattern was consistent after accounting for many other factors such as age, sex, lifestyle habits, and other clinical measurements. The finding held across two culturally and geographically distinct populations, lending additional credibility to the association.
This research suggests that combining inflammation and anemia-related information into a single ratio could be a useful, low-cost tool for identifying older adults at elevated stroke risk. Since both C-reactive protein and hemoglobin are routinely measured in standard blood tests, this ratio could potentially be calculated without any additional testing. However, further research would be needed to determine how this measure might be applied in clinical practice and whether addressing the underlying contributors to a high ratio reduces stroke risk.