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Hemoglobin A2, Quantitative
Test Code511
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: Sun, Tues-Sat; Report available: 1-3 days
Reference Range
0 Days-1 Month | <1.0 % | |||||
2-3 Months | <2.3 % | |||||
4-6 Months | <2.5 % | |||||
7-12 Months | <2.7% | |||||
>12 Months | 2.2-3.2 % |
Clinical Significance
Differential diagnosis of thalassemia and anemias. In B-thalassemia trait A2 is elevated.
Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Dr
Chantilly, VA 20153