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Glycohemoglobin (A1c)
MessageTest performed at York Hospital Laboratory.
Test Code
GLY
Alias/See Also
Hemoglobin A1c
CPT Codes
83036
Preferred Specimen
0.5 mL Whole Blood
Transport Container
Lavender Top EDTA Tube
Transport Temperature
Refrigerated
Specimen Stability
Room temperature: 24 hours
Refrigerated: 7 days
Frozen: Not recommended
NOTE: While specimens are stable for 7 days, the test cannot be added onto a sample older than 3 days.
Refrigerated: 7 days
Frozen: Not recommended
NOTE: While specimens are stable for 7 days, the test cannot be added onto a sample older than 3 days.
Methodology
High Performance Liquid Chromatography (HPLC)
Setup Schedule
Monday - Friday nights
Report Available
Next Day
Limitations
Reduced in vivo RBC survival rates result in falsely decreased levels. Most hemoglobinopathies produce invalid results.
Reference Range
Hgb A1c:
Normal range 4.5-6.1 %
Diabetic levels:
Therapeutic goal <7%
Re-evaluate therapy >8%
Calculated Mean Glucose Therapeutic Goal <150 mg/dL
Normal range 4.5-6.1 %
Diabetic levels:
Therapeutic goal <7%
Re-evaluate therapy >8%
Calculated Mean Glucose Therapeutic Goal <150 mg/dL
Clinical Significance
To assist with control of blood glucose levels, the American Diabetes Association (ADA) has recommended glycated hemoglobin testing (HbA1c) twice a year for patients with stable glycemia, and quarterly for patients with poor glucose control.
