Hemoglobin A1C

Test Code

LAB90

Alias/See Also

Glycosolated Hemoglobin; Glycated Hemoglobin; HA1C; A1C and Estimated Plasma Glucose; HGA1C

CPT Codes
83036

Includes

A1c Hemoglobin and Estimated plasma glucose (calculated)

Instructions

One 4 mL lavender (EDTA) or pink (K2EDTA) (Min: 2 mL); Blood by routine veinipunture.

Specimen Stability

4 mL whole blood in original lavender draw tube at 2-8°C. (Min: 2 mL)

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Failure to follow proper collection and storage procedures.

Methodology
High performance liquid chromatography (HPLC) - Bio-Rad Variant II

Setup Schedule

Daily/STAT

Report Available

within 24 Hrs

Reference Range

"A1c Hemoglobin: 4.0-6.0 %
Estimated plasma glucose: None established
Mean plasma glucose levels will generally be ten to twenty percent higher than mean whole blood glucose levels."

Clinical Significance

Therapy for diabetes requires the long-term maintenance of a blood glucose level as close as possible to a normal level, minimizing the risk of long-term vascular consequences. A single fasting blood glucose measurement is an indication of the patient's immediate past condition (hours), but may not represent the true status of blood glucose regulation. An accurate index of the mean blood glucose concentration may be established by the measurement of hemoglobin A1c every 2-3 months.

Additional Information
Fructosamine to A1c Conversion Table
NCD Glycated Hemoglobin

The CPT Codes provided in this document 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 payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.