Hemoglobin F (HbF)
- Sample Type
- Standard
- Fasting
- No
- Unit
- %
Hemoglobin F is the primary oxygen carrier in a fetus, but it is typically replaced by Hemoglobin A shortly after birth. In adults, HbF usually constitutes less than 1-2% of total hemoglobin. This test is a critical component of Hemoglobin Electrophoresis to diagnose Beta-thalassemia (where HbF is elevated to compensate for lack of HbA) and Sickle Cell Disease. It is also used to monitor the effectiveness of Hydroxyurea therapy, which works by increasing HbF levels.
Check Your Result
Check Your Result
Enter your lab result to see where you stand compared to the standard reference range.
Why Context Matters
Elevations can be caused by Hereditary Persistence of Fetal Hemoglobin (HPFH), which is a benign condition, but it can mimic more serious thalassemia traits on initial screening. Recent blood transfusions can also skew results significantly by introducing donor HbA.
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 F (HbF):
Official Sources
- Hemoglobin Test: MedlinePlus Medical TestMedlinePlus
Research & Guidelines
- PubMed: Hemoglobin F (HbF) 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.
Get Notified When Dr. Babu Is Available