Epic Test Code LAB90 Hemoglobin A1C (GHGB)
Performing Location(s)
BMC
LIS Code
GHGB
Synonyms
GHGB, Glycohemoglobin, Glycated hemoglobin, Hb A1c, Fast hemoglobins
Specimen Type
Whole Blood
Preferred Container
Lavender Top
Volume Required
1 mL
Minimum Volume
500 uL
Transportation Needs
Deliver specimens to the laboratory within 24 hours of collection.
Storage Requirements
Specimens not delivered to laboratory within 24 hours should be refrigerated
Whole Blood specimens are stable refrigerated at 2-8° Celsius for up to 14 days
Lavender top tubes are routinely stored at the lab for only 3 days therefore, an add-on may not be possible after 3 days.
For HBA1c (GHGB) whole blood specimens may be refrigerated at 2-8° Celsius for up to 14 days.
Causes for Rejection
Mislabeled or unlabeled specimen
Less than 50% draw for Vacutainer tubes
Collection in any anticoagulant other than K2 EDTA
>24 hrs at room temperature
>14 days refrigerated
Frozen Specimen
Limitations
- Abnormal RBC survival due to hemolytic anemia, recent significant blood loss or chronic blood loss.
- Hemoglobinopathies
- Hemoglobin adduct interferences
- Blood transfusions will "dilute" patients' endogenous RBC and may lead to falsely lower results
Reference Values
Pursuant to the 2016 American Diabetes Association recommendations for using HBA1c to diagnose and monitor diabetes using a NGSP certified method and standardized to the DCCT assay, the Clinical Laboratory use this reference range for HBA1c.
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Notes:
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In 2016 the ADA adopted the criterion of >/= 6.5% to diagnose diabetes. |
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Keep in mind that while the ADA recommends HBA1c can be used for diagnosis, Medicare is currently only reimbursing for HBA1c used to monitor diabetes. Medicare covers the following for screening for diabetes:
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Days of Analysis
M-F
Available STAT
No
Additional Information
Additional Information:
This test is not available on a STAT basis except for Diabetes Clinic patients. If an emergency request on other than a Diabetes Clinic patient is necessary, call 3725 for availability. Pathologist approval may be required.
Methodology
Tosoh HPLC
CPT Code
83036
Last Updated
13-Jun-18 BHD