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To view specimen requirements and codes please select your laboratory:
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1 mL whole blood collected in an EDTA (lavender-top) tube
Lithium heparin (green-top) tube
Repeated freezing and thawing (up to 10 times) does not affect the test result. Mix specimen thoroughly after thawing.
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 6 months
Sodium fluoride/oxalate (gray-top) tubes
|Quest Diagnostics Nichols Institute|
|14225 Newbrook Drive|
|Chantilly, VA 20153|
Setup: Mon-Fri a.m., night.; 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.
|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|
Assesses long term diabetic control in diabetes mellitus.
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 Name||LOINC Code||Component Name|
|496||Hemoglobin A1c||4548-4||Hemoglobin 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.