Glycated hemoglobin levels, especially above 6.0%, are better than fasting glucose for predicting long-term cardiovascular risk, the New England Journal of Medicine reports.
Researchers measured glycated hemoglobin and fasting glucose in some 11,000 adults without diabetes or cardiovascular disease and followed them for a median of 14 years. Compared with hemoglobin levels of 5.0% to 5.5%, higher values — especially above 6% — were associated with significantly increased risks for diabetes, coronary heart disease, and stroke. Associations between hemoglobin and all-cause mortality were also significant, but formed a J-shaped curve, with the lowest and highest levels being predictive of death.
These findings held true even after adjustment for fasting glucose.
The authors say their findings "may add to the evidence supporting the use of glycated hemoglobin as a diagnostic test for diabetes."
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