Hemoglobin Electrophoresis
Hemoglobin electrophoresis (or HPLC) separates the different hemoglobin variants in a blood sample — HbA (normal adult), HbA2, HbF (fetal), HbS (sickle), HbE, and others. It is the primary test for diagnosing thalassemia trait, thalassemia major, sickle cell disease, and other hemoglobinopathies. In India it is critical — thalassemia and HbE are common in many regions, and carrier screening is part of prenatal care.
Reference Ranges
Male
2 – 3.5
%
Female
2 – 3.5
%
Child
2 – 3.5
%
HbA2 range in adults; HbF higher in infants
Reference ranges may vary by laboratory. Always compare with the range printed on your lab report.
What Low Levels Mean
HbA2 below 2% is unusual and may suggest alpha-thalassemia trait or iron deficiency. HbF below 0.5% is normal in adults. Absent HbA with only HbS (as HbSS disease) or HbE (as HbEE) indicates homozygous disease and requires specialist follow-up.
What High Levels Mean
HbA2 above 3.5% is the hallmark of beta-thalassemia trait — common in India and usually asymptomatic but important for genetic counseling. HbE is identified by its own distinct band on electrophoresis (which co-migrates with HbA2 on alkaline gel but separates clearly on HPLC) — not by HbA2 percentage alone. Persistent HbF above 2% in adults suggests delta-beta thalassemia, hereditary persistence of fetal hemoglobin, or aplastic anemia. HbS or HbC presence identifies sickle cell or HbC traits and disease.
Frequently Asked Questions
Who should get a hemoglobin electrophoresis?
Anyone with unexplained microcytic anemia that is not responding to iron, anyone with a family history of thalassemia or sickle cell, and couples planning a pregnancy — especially in communities where thalassemia is common. Screening both partners helps identify couples at risk of having children with thalassemia major, who may benefit from genetic counseling.
Can iron deficiency mask thalassemia trait?
Yes. Iron deficiency lowers HbA2 and can mask beta-thalassemia trait on electrophoresis. If the clinical suspicion is high, iron studies should be done first, iron deficiency corrected, and the electrophoresis repeated. Otherwise you may miss a thalassemia diagnosis that is relevant for family planning.
Does thalassemia trait need treatment?
No. Thalassemia trait (heterozygous carrier) causes mild microcytic anemia that is often mistaken for iron deficiency. It does not progress and does not need iron therapy — in fact, unnecessary iron can cause overload. The clinical importance is in genetic counseling: two carriers can produce a child with thalassemia major, which is a serious lifelong condition.
Related Blood Count tests
See all →Hemoglobin (Hb)
Oxygen-carrying protein in red blood cells.
g/dLBlood CountHematocrit (HCT)
Percentage of blood volume occupied by red blood cells.
%Blood CountRed Blood Cell Count (RBC)
Total number of red blood cells per unit of blood.
million/µLBlood CountWhite Blood Cell Count (WBC)
Total number of immune cells fighting infection in your blood.
thousand/µLThis information is for educational purposes only and should not replace professional medical advice. Always consult your doctor for interpretation of your test results.
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