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Glossary Health & Fitness

A1C (HbA1c)

A1C is a blood test showing average blood sugar over the past two to three months, reported as the percentage of hemoglobin carrying sugar.

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In more detail

An estimated average glucose follows from 28.7 × A1C − 46.7: 7.0% corresponds to 154.2 mg/dL (8.6 mmol/L). Targets and diagnoses are for a clinician to set.

Try these tools

A1C to Average Blood Glucose Calculator

Convert between A1C percentage and estimated average glucose (eAG), in mg/dL or mmol/L.

See also

  • Glossary GFR (glomerular filtration rate)
    GFR is the volume of blood the kidneys filter per minute, estimated from a creatinine blood test, age and sex.
  • Cheat sheet Medical Formulas Cheat Sheet
    A1C to glucose, blood pressure bands, cholesterol, kidney function, QTc, blood alcohol and IV drip rate with worked examples.
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