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Test Code HBA1C Hemoglobin A1c, Blood

Reporting Name

Hemoglobin A1c, B

Useful For

Evaluating the long-term control of blood glucose concentrations in patients with diabetes


Diagnosing diabetes


Identifying patients at increased risk for diabetes (prediabetes)


This assay is not useful in determining day-to-day glucose control and should not be used to replace daily home testing of blood glucose.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Whole Blood EDTA

Specimen Required

Container/Tube: Lavender top (EDTA)

Specimen Volume: 3 mL

Collection Instructions: Send specimen in original tube. Do not aliquot.

Specimen Minimum Volume

2 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Whole Blood EDTA Refrigerated (preferred) 7 days
  Frozen  7 days
  Ambient  24 hours

Reference Values


<18 years: Hemoglobin A1c criteria for diagnosing diabetes have not been established for patients who are <18 years of age.

≥18 years: Increased risk for diabetes (prediabetes): 5.7-6.4%

Diabetes: ≥6.5%


Interpretive information based on Diagnosis and Classification of Diabetes Mellitus, American Diabetes Association.

Day(s) Performed

Monday through Sunday

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
HBA1C Hemoglobin A1c, B 4548-4


Result ID Test Result Name Result LOINC Value
HBA1C Hemoglobin A1c, B 4548-4

Report Available

Same day/1 day

Reject Due To

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Method Name

Ion-Exchange High-Performance Liquid Chromatography (HPLC)