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Test Code GLYCO Hemoglobin A1C LAB90

Test Method

Timed Endpoint; Beckman DXC600


Typically completed within 4 hours after the specimen
arrives at the testing site.

Useful For

Diagnosing diabetes

Evaluating the long-term control of blood glucose concentrations
in diabetic patients


Specimen Requirement

3 mL whole blood is required.

CPT Code Information

83036 Chemistry: Hemoglobin fractionation
and qunatitation; glycosylated (A1C)

NCD Frequency Limitations: It is not reasonable
and necessary to perform glycated hemoglobin tests more often than
every three months on a controlled diabetic patient to determine if
the patient’s metabolic control has been on average within the
target range.

Reference Values

Nondiabetic: <5.7%

Prediabetes 5.7 – 6.4%

Diabetes: ≥ 6.5%

The American Diabetes Association recommends
that HbA1C results be reported along with a
calculated Estimated Average Glucose (EAG). The new number is
derived from the HbA1C result and is based on a
standardized formula developed from the A1C-Derived
Average Glucose study (ADAG) which confirmed and defined a linear
relationship between estimated average daily glucose and
HbA1C. It is intended to help healthcare providers
communicate HbA1C results to patients using the same
units of measure (mg/dL) that patients are familiar with from their
routine whole blood glucose measurements.
 EAG(mg/dL) = 28.7 x HbA1C - 46.7

LOINC Code Information

17855-8 Hemoglobin A1c/Hemoglobin.Total In Blood

Additional Specimen Collection Information

Collect blood in a EDTA,
purple-top whole blood is preferred. Lithium heparin green-top
whole blood is also acceptable.