Use HbA1c Category Lookup when you need to classify a hemoglobin A1c percentage as normal below 5.7 percent, prediabetes below 6.5 percent, or diabetes otherwise. Enter HbA1c using the definitions and units below so the result can be reproduced.

HbA1c

A finite measured or assumed value from 3 through 20, expressed in %.

The published tool contract uses this rule: Classify a hemoglobin A1c percentage as normal below 5.7 percent, prediabetes below 6.5 percent, or diabetes otherwise.

Category

The calculated category.

The category is produced by fixed software thresholds. Those cutoffs may differ from a laboratory, field protocol, population, jurisdiction, or current professional guideline. It is informational and cannot diagnose a condition, select treatment, or replace professional interpretation of the original measurements. HbA1c must remain between 3 and 20.

Retain the original HbA1c values and their units alongside the result. eAG From A1c is useful when you instead need to estimate average glucose in mg/dL from hemoglobin A1c with the documented ADAG regression 28.7 x A1c - 46.7. Rule Of Three Hct provides another view by helping you approximate hematocrit from hemoglobin with the rule of three: each g/dL of hemoglobin contributes about three percent hematocrit.

• eAG From A1c

  Estimate average glucose in mg/dL from hemoglobin A1c with the documented ADAG regression 28.7 x A1c - 46.7.

• Rule Of Three Hct

  Approximate hematocrit from hemoglobin with the rule of three: each g/dL of hemoglobin contributes about three percent hematocrit.

• Hemoglobin From Hct Proxy

  Approximate hemoglobin in g/dL from hematocrit percent with the clinical rule of three: hemoglobin is about one third of hematocrit. This screening proxy can be unreliable when red-cell size or hemoglobinization is abnormal.