Fasting Blood Sugar vs HbA1c: Key Differences Explained
Confused between Fasting Sugar and HbA1c? Learn how these two tests differ, why doctors order both, and which test is more reliable for diabetes.
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74 Diagnostic Parameters Included
Fasting required: 8-10 hours overnight
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Fasting required: 8-10 hours overnight
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HbA1c + Fasting Sugar + Urine Glucose
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About Difference Between Fasting Blood Sugar and HbA1c Test with Healthians
Both Fasting Blood Sugar (FBS) and HbA1c measure blood glucose, yet they often yield seemingly contradictory results. One can be normal while the other is elevated. This comprehensive comparison explains why both tests are complementary and essential for mastering diabetes control.
- Time window: Fasting sugar captures a single instant (morning baseline). HbA1c captures a 90-day moving average.
- Fasting requirement: FBS requires 8-10 hours strict fasting. HbA1c requires zero fasting.
- Daily fluctuation: FBS is heavily influenced by last night's dinner, stress, and sleep quality. HbA1c ignores daily fluctuations.
- Diagnosis: Both tests are recognized by international diabetes associations; using both together prevents false negatives.
- Post-meal spikes: A patient with normal fasting sugar can still have an elevated HbA1c if post-meal sugars spike during the day.
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