The Study
Rectify the impact of shorter red blood cell lifespan upon HbA1c detection values in T2DM patients: modeling and internal-external verification
This study shows that in people with type 2 diabetes, having shorter-lived red blood cells is linked to HbA1c tests showing lower blood sugar than it really is. It’s like a weather report noticing that umbrellas come out more when it rains — it sees a pattern, but can’t prove one causes the other.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
HbA1c is a blood test that shows average sugar levels, but it can be off if red blood cells don’t live the usual amount of time. If they die early, the test may say sugar is lower than it really is.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 542 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This matters because doctors might think blood sugar is under control when it’s not, leading to too little treatment and higher risk of complications.
- 252% of people with type 2 diabetes have red blood cells that live less than 90 days; 19% have cells living 66 days or less.
- 3When cells live only 66 days, a math fix can make HbA1c more accurate.
- 4People with shorter-lived cells have higher risks of heart and nerve problems.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Frontiers in Endocrinology
Year
2025
Authors
Li Zhang, Ximan Gao, Xuying Meng, Guangyang Ma, Jing Li, Weilin Wang, Sisi Chen, Yongjian Ma, Pei Yu, Saijun Zhou
Related Content
Claims (9)
Your HbA1c number isn't just about your average blood sugar — it also depends on how long your red blood cells live. The longer they stick around, the more sugar builds up on them, which can raise your HbA1c even if your blood sugar is stable.
If your red blood cells live longer or shorter than average, your A1C test might not give a true picture of your average blood sugar levels.
If you have type 2 diabetes and your red blood cells don’t live very long, there’s a math formula that can give a better picture of your blood sugar control by adjusting your HbA1c test result.
Lots of people with type 2 diabetes have red blood cells that don’t live as long as usual, and because of that, their A1c blood sugar test might show lower numbers than reality — meaning the test could be misleading for many.
If you have type 2 diabetes, higher blood sugar might make your red blood cells die faster, which could mess up the accuracy of your A1c test — a common way doctors check long-term blood sugar control.
If you have type 2 diabetes and your red blood cells don’t live as long as they should—less than 90 days—you might be at higher risk for heart problems and nerve damage, possibly because doctors don’t get the full picture of your blood sugar levels over time.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.