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Haemoglobin HPLC and electrophoresis: reading your report | CION Cancer Clinics
HPLC and haemoglobin electrophoresis show which types of haemoglobin your red cells make and roughly how much of each. That reveals whether you carry a thalassaemia or sickle cell trait, or have the condition itself. A raised HbA2 usually means beta thalassaemia trait. A normal result does not rule out alpha thalassaemia trait, and low iron or a recent transfusion can change the picture. This page explains each line. At CION Cancer Clinics, our haematologist reviews abnormal blood reports with you, orders only the tests that answer your question and explains each result plainly.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- What does an HPLC or electrophoresis test show?
- What do the lines on an HPLC report mean?
- Which results come back most often?
- What can make the result wrong or unclear?
- What happens if both partners are carriers?
- What do families believe about carrier results?
- What can this test not tell you?
- Common questions about HPLC and haemoglobin electrophoresis
The short answer
What does an HPLC or electrophoresis test show?
It shows which types of haemoglobin your red cells make, and roughly how much of each. That tells the doctor whether you carry a thalassaemia trait, a sickle cell trait or another inherited change in haemoglobin, or whether you have the condition itself.
HPLC and electrophoresis are two ways of asking one question
Both separate the different haemoglobins in a blood sample. HPLC pushes the sample through a column and times how long each type takes to come out. Electrophoresis moves the types apart using an electric current. Many labs use HPLC first and confirm an unusual result with the second method or a DNA test.
Why it was asked for
Usually because a blood count showed small, pale red cells that low iron did not explain. It is also asked for before marriage or in early pregnancy, when a family member has thalassaemia or sickle cell disease, and in children with a low haemoglobin since early life.
On your report
What do the lines on an HPLC report mean?
- HbA
- Adult haemoglobin. In most adults it makes up nearly all of the haemoglobin.
- HbA2
- A small normal fraction. When it is raised above the lab's cut-off, beta thalassaemia trait is the usual explanation.
- HbF
- Foetal haemoglobin, the main type before birth. It falls in the first year of life. A raised level in an adult has several possible causes.
- HbS, HbE, HbD
- Variant haemoglobins. HbS is the sickle cell type. HbE and HbD are other inherited variants seen in India.
- Retention time and window
- Where on the run each type appeared. A peak in the "S window" suggests HbS but does not prove it, so a confirming test may follow.
- Interpretation or impression
- The pathologist's summary line. It is written for your doctor and often says "suggested" or "correlate", meaning other results are needed.
Not sure whether this applies to you?
Ask an oncologistCommon results
Which results come back most often?
Carrying a trait and having the disease are very different things. Most people tested fall into the first group.
No variant found
Normal pattern. It makes beta thalassaemia trait and sickle trait unlikely. It does not rule out alpha thalassaemia trait, which HPLC often misses.
Beta thalassaemia trait
HbA2 raised, often with small red cells. You are a carrier, usually with mild or no symptoms. It is not the same as thalassaemia major and does not need transfusions.
Why it still matters
- Your partner may need testing before pregnancy
- It can be mistaken for low iron
Sickle cell trait
Both HbA and HbS present. You are a carrier and usually well. If HbS is present with little or no HbA, a haematologist should review you for sickle cell disease.
A disease pattern
Very little or no HbA, with HbF or a variant making up most of the haemoglobin. This points to thalassaemia major, intermedia or sickle cell disease, and needs a haematologist to plan long-term care.
Where results mislead
What can make the result wrong or unclear?
Three things cause most confusion: low iron, a recent blood transfusion, and the age of the person tested. Tell the doctor about all three before the sample is taken.
Low iron can hide a trait
Iron deficiency can pull HbA2 down, so a beta thalassaemia carrier may show a normal-looking result. Doctors often check iron studies at the same time, and may repeat the HPLC after iron has been corrected.
A transfusion mixes in someone else's blood
After a transfusion, part of what is tested is the donor's haemoglobin. The result then describes a mix, not you. Your haematologist will advise how long to wait, or suggest testing the parents or a DNA test instead.
Babies are different
Newborns make mostly HbF, so adult reference patterns do not apply. Infant results are read against age-specific ranges and are sometimes repeated later in the first year.
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Planning a family
What happens if both partners are carriers?
Test the partner
If one of you carries a trait, the other is tested. If only one is a carrier, a child cannot inherit the major form from that pairing.
Genetic counselling
If both carry a trait, each pregnancy carries a chance of a child with the major condition. A counsellor explains that chance for your specific combination.
Know the options early
Testing of the baby during pregnancy is possible at specialist centres. It works best when couples know their status before or very early in pregnancy.
Your choice, your pace
What you do with the information is your decision. The purpose of testing is to let you choose with clear facts.
Commonly believed
What do families believe about carrier results?
"Trait means he has thalassaemia and will need blood."
A carrier has one changed gene and usually lives a normal life without transfusions. The trait does not turn into the major disease later.
"She is a carrier, so the marriage should not happen."
A carrier marrying a non-carrier cannot have a child with the major condition. What matters is testing both partners and getting counselling if both carry a trait.
"Iron tablets will fix the small red cells."
If the cells are small because of a trait, iron does not change them, and extra iron may be harmful. Iron is given only when tests show it is actually low.
"The report was normal, so no thalassaemia runs in our family."
A normal HPLC often misses alpha thalassaemia trait, and low iron can mask beta trait. If the red cells stay small, ask whether further tests are needed.
Being straight with you
What can this test not tell you?
HPLC shows the pattern of haemoglobin. It does not name the exact gene change, and it cannot always tell apart two conditions that look alike on the run. A DNA test answers those questions when they matter, for example in pregnancy planning.
It does not predict how severe a condition will be
Two people with the same result can have very different courses. How a person is doing depends on their symptoms, their blood counts over time and other inherited factors. Your haematologist reads all of that together.
It is not a cancer test
HPLC looks for inherited haemoglobin types. A result showing a trait does not suggest blood cancer, and a normal result does not rule one out. If you are worried about other blood count changes, raise those separately with the doctor.
Questions we are asked
Common questions about HPLC and haemoglobin electrophoresis
Do I need to fast for HPLC?
No. Food does not change the types of haemoglobin in your blood, so a sample can be taken at any time. If other tests are being drawn at the same visit, such as iron studies, follow the lab's instructions for those.
Is the result valid for life?
Your inherited haemoglobin type does not change, so a clear, confirmed result usually does not need repeating. A result taken while iron was low, soon after a transfusion or in early infancy may need a repeat. Keep a copy of the report safely.
Should my children be tested if I am a carrier?
Each child may or may not have inherited the trait. Knowing helps them later, when planning a family. Ask your doctor the right age to test, because results in very young babies are read differently from those in older children.
Why did the lab say "correlate with family studies"?
Some patterns can have more than one explanation. Testing parents, brothers or sisters often shows which trait runs in the family and clears up the uncertainty. It is a routine request and does not mean something serious was found.
Is sickle cell trait common in Telangana and Andhra Pradesh?
Sickle cell trait is more common in some communities, including several tribal groups in both states, and government screening programmes focus on these areas. Thalassaemia trait is found across communities. Anyone with a family history should consider testing.
My HbF is slightly raised. What does that mean?
A mild rise in an adult has several possible causes, including some inherited traits, pregnancy and certain other blood conditions. On its own it is rarely a diagnosis. Your doctor reads it with your blood count and other results, and may ask for further tests.
Can this test be done at home collection?
Yes, it needs only an ordinary blood sample from a vein, sent to a lab that runs HPLC. Mention any recent transfusion or iron treatment when the sample is taken, because the lab reads the result with that in mind.
Who should read the report with me?
The doctor who ordered it first. If the result suggests a disease pattern, is unclear, or you and your partner are both carriers, a haematologist such as Dr. Basudev Pokhrel at CION can go through it and help arrange counselling or confirmatory tests elsewhere.
Your Haematologist
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Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- NHS — Thalassaemia
- NHS — Sickle cell disease
- NHLBI — Thalassemias
- NHLBI — Sickle Cell Disease
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Iron Studies ExplainedLow iron can hide a thalassaemia trait on HPLCThe Complete Blood Count Explained Line by LineThe red cell size that usually leads to this testHome Blood Collection for Haematology TestsGiving the sample without travellingHaematology Tests ExplainedEvery blood test in this series
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Tell us what has been found so far. Our haematology team will read it with your blood count and help you plan the next step. One helpline serves every CION centre.