Antrim #21245, EPIC: LAB5862, SOFT: HGEVL
A Complete Blood Count (CBC) is required to perform a Hemoglobinopathy Evaluation. Therefore, if a CBC has not been performed within the last 30 days, a CBC will be ordered.
Specimen Collection Criteria
Collect: One Lavender-top EDTA tube for Hemoglobinopathy Evaluation AND one Lavender-top EDTA tube for Complete Blood Count. (Minimum Whole Blood: 1.0 mL each tube.)
NOTE: The second Lavender-top EDTA tube is not required if a Complete Blood Count (CBC) or CBC with Differential (CBCD) is ordered and drawn at the same time, or has been performed in the last 30 days. If there is not a separate order for a CBC, and CBC will be ordered.
Physician Office/Draw Specimen Preparation
Do not centrifuge. Do not freeze. Store whole blood refrigerated (2-8°C or 36-46°F) prior to transport. (Minimum Whole Blood: 1.0 mL each tube.)
Preparation for Courier Transport
Transport: Whole blood specimen or packed cells, refrigerated (2-8°C or 36-46°F). (Minimum Whole Blood: 1.0 mL each tube.)
- Frozen specimens.
- Centrifuged specimens.
- Severely hemolyzed specimens.
Do not centrifuge. Do not freeze.
Specimen Stability for Testing:
Room Temperature (20-26°C or 68-78.8°F): 48 hours
Refrigerated (2-8°C or 36-46°F): 3 days
Frozen (-20°C/-4°F or below): Unacceptable
Specimen Storage in Department Prior to Disposal:
Refrigerated (2-8°C or 36-46°F): 7 days
Royal Oak Special Testing Laboratory
Sunday – Saturday (day shift only).
Confirmation of Hemoglobin variant by electrophoresis performed on Thursday.
Results available in 3–5 business days.
||Reference Range (%)
| Hb A2
|| Less than 12 months
|| 0.0 - 3.3
| Hb A2
|| 1 year – Adult
|| 2.0 - 3.3
|| 0-30 days
|| 60 - 90
|| 31 days – 23 months
|| Less than or equal to 60
|| 2 years – Adult
|| 0.0 - 2.0
|| 0-30 days
|| 10 - 40
|| 31 days – 24 months
|| 40 - 98.5
|| 2 years – Adult
|| 94.5 - 98.5
Electrophoresis and High Performance Liquid Chromatography (HPLC).
The lab protocol consists of automatic chromatographic analysis (HPLC) to quantitate Hgb A2, fetal hemoglobin and Hgb A. If an abnormal hemoglobin is identified by chromatography, electrophoresis (alkaline and/or acid gel) will be performed to confirm the identity of the variant hemoglobin. If an abnormal hemoglobin is not identified, electrophoresis will not be performed routinely.
The final interpretation is made by a pathologist.
Our current methods allow for detection of a number of hemoglobins including Hemoglobin S, C, D, E, Hasharon, Lepore, some A2 variants and usually G Philadelphia. It can also be determined whether an individual is heterozygous or homozygous for the hemoglobin variant. Because of the great number of hemoglobin variants, the Beaumont Laboratory is unable to identify all possible variants and in some cases the blood sample or an additional sample is sent to Mayo Medical Laboratories. Based on hemoglobin A2 and F levels and CBC results, diagnoses of ß (beta) or delta-ß (delta-beta) thalassemia (hetero or homozygous) can be made.
Hbg A2 is elevated in ß thalassemia trait, although if a patient has co-existing iron deficiency, the Hgb A2 level may be normal. Hgb A2 levels are also elevated in sickle cell trait, sickle cell disease, megaloblastic anemia and hyperthyroidism. Only ß thalassemia (hetero or homozygous) would be associated with thalassemic CBC indices (low MCV, high or high-normal RBC). Hgb A2 levels are low or low-normal in alpha thalassemia, delta thalassemia, iron deficiency and sideroblastic anemia.
Hgb F levels are much higher in the neonate than an older child or adult. Hgb F may be slightly increased in ß thalassemia trait and moderately increased in delta-beta thalassemia. It is also increased in hereditary persistence of fetal hemoglobin, a condition most commonly seen in African-Americans. Slight increases may also be acquired and can occur with several bone marrow abnormalities (e.g., leukemias, aplastic anemia), severe anemias and in pregnancy.
Hemoglobin electrophoresis is usually ordered for detection of abnormal hemoglobins, ß thalassemia, and hereditary persistence of fetal hemoglobin (HPFH). It cannot be used to detect alpha thalassemia trait in individuals over a few weeks of age.
83021. If reflexed, add 83020.
Special Chemistry Laboratory – RO
Microtainer® and Vacutainer® are registered trademarks of Becton, Dickinson and Company.
UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.