Hemoglobin A1C

Tube Type

Test ID LAB90
CPT Code(s) 83036
Group/Individual Test Group
Laboratory Core Laboratory
Tube Station 30
Specimen Routine: 3 mL blood/lavender top tube
Micro: 500 uL blood/lavender top bullet (minimum volume-allows for no repeats)
Stability Whole blood:
Room temperature: 2 days
Refrigerator: 7 days
Frozen: 21 months
Availability Routine: 24 hrs/day
Turnaround Time Routine: 6 hours; STAT: 1 hour
Reference Range
Normal: 4.8-5.6%
Screening or Diagnosis of Diabetes Mellitus*
HA1c Reference Interval Interpretation
4.8-5.6 Normal
5.7-6.4 Dysglycemia
>6.4 Diabetes Mellitus
*Not recommended for diagnosis of diabetes in children with Cystic Fibrosis or with symptoms suggestive of acute onset type 1 diabetes.
HA1c Glycemic Goals: <7%
Goals should be individualized; more or less stringent A1c glycemic goals may be appropriate for individual patients.
(Adopted from: 2020 ADA Standards of Medical Care in Diabetes)

Includes calculation of Estimated Average Glucose(eAG) using the equation: eAG mg/dL = [28.7 X HbA1C]-46.7. There is no reference range associated with the calculation. The calculation cannot be performed when the HbA1C concentration is outside the analytical measuring range. There is no charge for the calculation.

Reviewed by Christopher Parker on December 28, 2021

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514