Hemoglobin A
- Sample Type
- Standard
- Fasting
- No
- Unit
- %
Hemoglobin A (HbA) is the major adult form of hemoglobin, consisting of two alpha and two beta chains. In healthy adults, it should comprise the vast majority of total hemoglobin. This test is part of an electrophoresis panel used to screen for hemoglobinopathies like Sickle Cell Disease or Thalassemia. A decrease in the percentage of HbA indicates the presence of variant hemoglobins (HbS, HbC) or a defect in chain synthesis.
Check Your Result
Check Your Result
Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
A recent blood transfusion (within the last 3-4 months) can introduce donor HbA into a patient with a hemoglobinopathy, resulting in a 'normal' HbA level that masks their actual genetic condition. Clinical history of transfusion is vital.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Hemoglobin A:
Official Sources
- ASH Clinical Practice Guidelines - Hematology.orghematology.org
- Significant haemoglobinopathies: guidelines for screening and diagnosis - PubMedpubmed.ncbi.nlm.nih.gov
- Guidelines for screening, diagnosis and management of hemoglobinopathies - PMCpmc.ncbi.nlm.nih.gov
Research & Guidelines
- PubMed: Hemoglobin A Clinical GuidelinesNCBI / PubMed
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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