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Hemoglobin A1c

Test Code

496

CPT Code(s)

83036

Preferred Specimen(s)

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

Minimum Volume

0.5 mL

Alternative Specimen(s)

Lithium heparin (green-top) tube

Collection Instructions

Repeated freezing and thawing (up to 10 times) does not affect the test result. Mix specimen thoroughly after thawing.

Transport Temperature

Room temperature

Specimen Stability

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

Reject Criteria

Sodium fluoride/oxalate (gray-top) tubes

Methodology

Immunoturbidimetric

Performing Laboratory

Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

Setup Schedule

Setup: Mon-Fri a.m., night.; Report available: Next day

Limitations

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)

For the purpose of screening for the presence of diabetes:
% of total HgB Interpretation
<5.7 Consistent with the absence of diabetes
5.7 - 6.4 Consistent with increased risk for diabetes (prediabetes)
> or = to 6.5 Consistent with diabetes

Clinical Significance

Assesses long term diabetic control in diabetes mellitus.

Alternative Name(s)

A1c

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
Code
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.