Hemoglobin A2, Quantitative (A2)

Blood transfusion within the last 4 months may affect results.

Test Code

Quest Code

Alias/See Also

CPT Codes

Preferred Specimen
Whole blood collected in a lavender-top (EDTA) tube.
Submit 2 lavender-top (EDTA) tubes if a CBC is also being requested.

Patient Preparation
Blood transfusions within the last 4 months may affect results.

Minimum Volume
1 mL

Submit 2 EDTA (lavender-top) tubes if a CBC is also being requested

Transport Container
EDTA (lavender-top) tube

Transport Temperature
Room temperature

Specimen Stability
Room temperature: 5 days
Refrigerated: 7 days
Frozen: Unacceptable

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

Capillary Electrophoresis

Setup Schedule
Monday through Friday

Report Available
3 days

Reference Range
≤1 Month <1.0 %
3 Months <2.3 %
6 Months <2.5 %
12 Months <2.7 %
>12 Months 1.8-3.5 %

Clinical Significance
Differential diagnosis of thalassemia and anemias. In B-thalassemia trait A2 is elevated.

Performing Laboratory
Quest Diagnostics - South Region

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.