Hemoglobin (Hb) A2, Quantitative
Also known as: A2, Quantitative, Hb A2, Quantitative
Use
Investigate for hemolytic anemia, hemoglobinopathies, and thalassemia
Special Instructions
Specify on the request form the patient's race or ethnic origin (if known) and the date of any transfusions administered within the preceding three months. To avoid delays in turnaround time, please submit a separate lavender-top tube for each test requiring a lavender-top.
Limitations
Blood transfusion prior to hemoglobin analysis may cause inconsistent interpretation. The microcytosis and other morphological changes of beta-thalassemia trait must be differentiated from iron deficiency, as iron deficiency can affect Hb A2 levels. The most definitive evidence for the presence of β-thalassemia trait is genetic testing or family studies.
Methodology
Other
Biomarkers
LOINC Codes
- 4552-6
- 4552-6
- 42245-1
Result Turnaround Time
2-5 days
Related Documents
For more information, please review the documents below
Specimen
Whole Blood
Volume
1 mL
Minimum Volume
0.5 mL
Container
Lavender-top (EDTA) tube
Collection Instructions
Submit a separate lavender-top tube for each test requiring a lavender-top.
Patient Preparation
Fasting or fluid restriction is not necessary.
Storage Instructions
Refrigerate at 2°C to 8°C.
Causes for Rejection
Clotted specimen
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 14 days |
| Refrigerated | 14 days |
| Frozen | 14 days |