Foetal haemoglobin (HbF) test
Quick answer: This test measures foetal haemoglobin (HbF), the main type of haemoglobin before birth, which is normally very low in adults. It helps diagnose and follow thalassaemia and sickle cell disease and related conditions.
- SampleBlood
- TakesAbout 5 minutes
- Before the testNo special preparation is usually needed.
How the test is done
- 1Blood is drawn into a purple-top tube
- 2The lab separates the haemoglobin types, often by HPLC
- 3The share of HbF is measured as a percentage
- 4The result is read with the other haemoglobin types
What your results can mean
Reading your report
HbF can be slightly raised in pregnancy and some other conditions; discuss your result with your doctor.
If the result is outside the usual range
A raised HbF can be seen with beta thalassaemia, sickle cell disease, hereditary persistence of foetal haemoglobin and pregnancy. Some medicines, such as hydroxyurea, also raise it.
Who usually has this test
People being checked for thalassaemia or sickle cell disease, and some people with unexplained anaemia.
Risks and aftercare
Bruising is possible; genetic counselling may be offered if a trait is found.
Names and options
Also called: HbF, fetal hemoglobin
Listed by the hospital as
- FOETAL HAEMOGLOBIN (HB F)
Questions about this test
Is a raised HbF harmful?
HbF itself is not harmful and can even ease sickle cell disease. The raised level is a clue to the underlying condition.
Is HbF higher in babies?
Yes, babies are born with high HbF, which falls over the first months of life. Results in infants are read with their age in mind.
What is the Kleihauer test?
It is a related test that counts the baby's red cells in the mother's blood after bleeding or birth. It helps decide the anti-D dose for Rh-negative mothers.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.