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Hematology Test

Fetal Hemoglobin/ HbF.

Dr. Reeja Tharu
Written by Dr. Reeja Tharu, M.Phil.,Ph.D
Dr. Simi Paknikar
Medically Reviewed by Dr. Simi Paknikar, MD
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Test : Fetal Hemoglobin/ HbF.


Indications : The test is used to evaluate hemaglobinopathies, hemolytic anemia, hereditary persistence of fetal hemoglobin, Thalassemia.

Physiology : Fetal hemoglobin is formed of two α-chains and two γ-chains. It is the major hemoglobin during fetal life. HbF levels decrease after birth by 3% to 4% each week. In 2-3 weeks fetal hemoglobin is about 65%. By 6 months of age fetal hemoglobin is < 2% of the total hemoglobin.

Normal Range : 0 – 6 months : Upto 75% of HbF, 6 months - Adult: Up to 2% HbF

Interpretation : Click Here To View Conditions Associated with Increase in Fetal Hemoglobin

Related Tests : Hemolytic disease of newborn, Kleinauer-betke, Sickle Cell test

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FINCY, Bahrain

I am in my 3 months pregnancy and while blood test HB f shows 23, which indicates High. What are the adverse effects because of this? Will it affect my baby?

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