1. What is Hemoglobin A1C?

Hemoglobin A1C (glycated hemoglobin) reflects average blood glucose levels over the past 2-3 months. It's a crucial marker for diabetes diagnosis and management.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( A1C \) — Glycated hemoglobin (percentage)
• \( eAG \) — Estimated average glucose (mg/dL)

Explanation: This formula converts average glucose levels (eAG) to the A1C percentage that would be measured in a laboratory test.

3. Importance of A1C Measurement

Details: A1C provides a more comprehensive picture of blood sugar control than single glucose measurements and is used for diabetes diagnosis and monitoring treatment effectiveness.

4. Using the Calculator

Tips: Enter your estimated average glucose in mg/dL. The value must be greater than 0. For best results, use glucose data from continuous monitoring or frequent testing over several months.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between A1C and daily glucose readings?
A: A1C reflects long-term (2-3 month) average glucose control, while daily readings show immediate blood sugar levels.

Q2: What are normal A1C values?
A: Normal is below 5.7%, 5.7-6.4% indicates prediabetes, and 6.5% or higher suggests diabetes.

Q3: How often should A1C be tested?
A: Typically every 3 months for diabetes management, or every 6-12 months for prediabetes screening.

Q4: Are there limitations to A1C?
A: Less accurate in conditions affecting red blood cell turnover (anemia, hemoglobin variants, recent blood loss/transfusion).

Q5: Can A1C be converted back to eAG?
A: Yes, using the formula: \( eAG = (28.7 \times A1C) - 46.7 \)