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Hemoglobin A1c

Test Code


CPT Code(s)


Preferred Specimen(s)

1 mL whole blood collected in an EDTA (lavender-top) tube

Minimum Volume

0.5 mL

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 7 days
Frozen: 6 months

Reject Criteria

Sodium fluoride/oxalate (gray-top) tubes • Heparinized plasma



Performing Laboratory

Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

Setup Schedule

Set up: Daily a.m., nights; Report available: Next day


Hemoglobin A1c is observed to be lower in healthy pregnant women than healthy non-pregnant women. Medical conditions associated with high red blood cell turnover are associated with lower hemoglobin A1c results.

Reference Range(s)

<5.7 % of total hemoglobin

Clinical Significance

To assist with control of blood glucose levels, the American Diabetes Association (ADA) has recommended glycated hemoglobin testing (HbA1c) twice a year for patients with stable glycemia, and quarterly for patients with poor glucose control. Interpretative ranges are based on ADA guidelines.

Alternative Name(s)


LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result NameLOINC CodeComponent Name
496Hemoglobin A1c4548-4Hemoglobin A1c/Hemoglobin.total

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.