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The only way to get an "average" reading is to take multiple readings, not just one. Your question sounds like the glycated hemoglobin or "A1C" test. The average lifespan of the red blood cell is 120 days, so checking A1C levels about every 90 days would be about right. For more detailed information, please see link below:

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Q: What blood test measures average blood glucose for 90 days?
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