Hemoglobin A1C

Tube Type

Test ID

LAB90

EPIC Order

HGB A1C; HEMOGLOBIN A1C

CPT Code(s)

83036

Group/Individual Test

Group

Laboratory

Core Laboratory

Tube Station

30

Specimen

Routine:

3 mL blood/lavender EDTA tube

Micro:

500 uL blood/lavender EDTA bullet (minimum volume-allows for no repeats)

Stability

Whole blood:

Room temperature: 48 hrs

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	Age Group
<7.5%	<18 yrs
<7.0%	≥18 yrs

Goals should be individualized; more or less stringent A1c glycemic goals may be appropriate for individual patients.

(Adopted from: 2024 ADA Standards of Medical Care in Diabetes)

Comment

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 J. Carr on January 13, 2026

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