HbA1c reflects average blood glucose over approximately what timeframe?

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Multiple Choice

HbA1c reflects average blood glucose over approximately what timeframe?

Explanation:
HbA1c shows the average blood glucose over the lifespan of red blood cells, which is about 120 days. Because red cells circulate for roughly 4 months, the HbA1c value integrates glucose exposure over the past two to three months, with more influence from the recent weeks as older cells are replaced. That’s why HbA1c isn’t sensitive to daily fluctuations but reflects longer-term control. Shorter timeframes like a few days or a single month don’t capture this extended period, making two to three months the best fit.

HbA1c shows the average blood glucose over the lifespan of red blood cells, which is about 120 days. Because red cells circulate for roughly 4 months, the HbA1c value integrates glucose exposure over the past two to three months, with more influence from the recent weeks as older cells are replaced. That’s why HbA1c isn’t sensitive to daily fluctuations but reflects longer-term control. Shorter timeframes like a few days or a single month don’t capture this extended period, making two to three months the best fit.

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