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Test Code 13C Hemoglobin A1C

Additional Codes

MLAB: A1C

PowerChart: Glycohemoglobin (HGB A1C) Panel

Epic: LAB90 Hemoglobin A1C

MA Cerner: Hemoglobin A1C.

Test Method

UCL: Timed Endpoint; Beckman DXC600/DXC880i

MA East and West:

Adult Specimens:

Hb: Modified Alkaline Hematin Reaction; Siemens

A1C: Turbidimetric Inhibition Immunoassay (TINIA); Siemens

Pediatric Specimens:

Hb: Colorimetry; DCA

A1C: Turbidimetry; DCA

Specimen Requirement

UCL: 3 mL whole blood is required.

MA: 3 mL whole blood is required

Pediatric: 0.1 mL capillary whole blood is required

Additional Specimen Collection Information

UCL:

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

MA:

Adult: Collect blood in a EDTA, purple-top whole blood is preferred.

Pediatric: Collect fingerstick samples in EDTA capillary micro tube.

Performance

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

MA: Typically completed as requested.

Reference Values

Nondiabetic: ≥ 1.5 yrs: 4.0 - 6.0%

Prediabetes 5.7 - 6.4%

Diabetic patients:

Diabetes: ≥ 6.5%

Well-controlled: <7%

Poorly-controlled: >8%

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

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.

Useful For

Diagnosing diabetes

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

 

LOINC Code Information

4548-4 Hemoglobin A1c/Hemoglobin.Total In Blood