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Hemoglobin A2, Quantitative
MessageOrder in Quanum to QNI
Test Code
HGBA2
Quest Code
511X
Alias/See Also
511X, 3786
CPT Codes
83020
Preferred Specimen
5 mL whole blood collected in an EDTA (lavender-top) tube
Patient Preparation
Blood transfusions within the last 4 months may affect results.
Minimum Volume
1 mL
Instructions
Submit 2 EDTA (lavender-top) tubes if a CBC is also being requested
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 5 days
Refrigerated: 7 days
Frozen: Unacceptable
Refrigerated: 7 days
Frozen: Unacceptable
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis • Clotted
Methodology
Capillary Electrophoresis
Setup Schedule
Set up: Daily; Report available: 2-3 days
Reference Range
<1 Month | <1.0 % | |||||
1-3 Months | <2.3 % | |||||
4-5 Months | <2.5 % | |||||
6-11 Months | <3.0% | |||||
1-4 Years | <3.2 % | |||||
≥5 Years | 2.0-3.2 % |
Clinical Significance
Differential diagnosis of thalassemia and anemias. In B-thalassemia trait A2 is elevated.
Performing Laboratory
Quest Diagnostics Nichols Institute
33608 Ortega Highway
San Juan Capistrano, CA 92690-6130