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.
Evidence from Studies
Supporting (3)
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Estimation of HbA1c Levels in Transfusion-Dependent Thalassemia Patients in Comparison With Normal Healthy Individuals
The study shows that people with a blood disorder that affects red blood cell life have misleadingly high HbA1c levels, even when their blood sugar is normal, which supports the idea that red blood cell lifespan can throw off HbA1c readings.
The study found that people with shorter-lived red blood cells have lower HbA1c levels even if their blood sugar is high, which can be misleading—just like the claim says.
Accurate prediction of HbA1c by continuous glucose monitoring using a kinetic model with patient-specific parameters for red blood cell lifespan and glucose uptake
The study shows that when doctors account for how long a person’s red blood cells live, they can predict their HbA1c more accurately, which means red blood cell lifespan really does affect HbA1c results.
Contradicting (0)
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Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.