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Diabetes / Glucose

Estimated Average Glucose (eAG)

Also known as: eAG, A1C, Hemoglobin A1C

CPT 84439Quest 866LabCorp 010389
Critical — Seek Care

If you experience symptoms like extreme thirst, frequent urination, blurred vision, or confusion, contact your doctor immediately. If you have very low blood sugar symptoms like dizziness, sweating, or severe weakness, seek urgent medical care.

What It Measures

The eAG test tells you your average blood sugar over the last two to three months. It is figured out from your A1C test result.

Why It's Ordered

Your doctor uses the eAG to help you understand your blood sugar over time. It helps you and your doctor see if your diabetes plan is working well.

Reference Range

Reference ranges for eAG can vary by laboratory. Your doctor will consider your individual health, age, and other factors when interpreting your results. The eAG is an estimate and may not always match your daily blood sugar readings.

Clinical Reference

Quest: 866
LabCorp: 010389
CPT: 84439
ICD-10: E03.9, E03.8, E05.90, R94.6

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Educational purposes only — This information is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your lab results with your healthcare provider.