What the HPLC test is
HPLC stands for high-performance liquid chromatography. The lab takes a small blood sample (a normal EDTA tube, the same kind used for a blood count), breaks open the red cells and pushes the hemoglobin through a column. Each type of hemoglobin comes out at its own time, called its retention time, and lands in a named "window." The report lists the percentage of each type, usually with a graph of peaks (a chromatogram).
Labs list it under several names: Hb HPLC, hemoglobin variant analysis, Hb typing, thalassemia screen or HbA2 estimation. They all mean roughly the same test.
Who should get one
- Couples before marriage or pregnancy, especially with roots in South Asia, the Middle East, the Mediterranean, Southeast Asia or Africa.
- The partner of anyone who is a carrier. One carrier alone doesn't put children at risk of a serious disorder; two carriers can.
- Anyone with small red cells (low MCV and MCH on a blood count) whose iron levels are normal.
- Anyone with a relative who has thalassemia, sickle cell disease or another hemoglobin disorder.
How to read your HPLC report
Every lab prints its own reference ranges, so always compare with the ones on your report. These are the common patterns:
| What the report shows | What it usually means |
|---|---|
| HbA about 95–98%, HbA2 under about 3.5%, HbF under about 1–2% | Normal pattern. Alpha-thalassemia trait can still hide behind a normal report (see below). |
| HbA2 about 4% or more (usually 4–7%), often with small red cells | Beta-thalassemia trait (thalassemia minor). Healthy, but important for your children. What it means. |
| HbA2 3.5–3.9% | Borderline. Could be a mild beta-thalassemia mutation, iron deficiency hiding a carrier, or nothing. See below. |
| A large peak in the S window (often about 30–40%) alongside HbA | Sickle cell trait (HbAS). Sickle cell in India. |
| A very high "HbA2" or A2/E peak, around 25–30% | Usually HbE trait, common in eastern and northeastern India. HbE comes out in the same window as HbA2 on most machines, so this isn't beta-thalassemia trait. |
| A peak in the D window (often around 25–40%) | Often HbD Punjab trait, one of the commonest variants in northwest India. Other rare hemoglobins can land in the same window, so labs may confirm it. |
| HbF raised (roughly 5–30%) with normal HbA2 | Possibly HPFH or delta-beta thalassemia. A DNA test tells them apart. |
| Mostly HbF, little or no HbA (usually in a baby or child) | Possible thalassemia major or another serious disorder. Needs a hematologist straight away. |
Borderline HbA2 (3.5–3.9%)
Labs don't all use the same cut-off. Some call 3.5% and above trait, others use 3.9% or 4%, and many treat 3.5–3.9% as a grey zone. That grey zone matters: Indian studies of people with borderline HbA2 have found a real beta-globin mutation in a meaningful share of them, from roughly 1 in 10 to 1 in 3 depending on the group studied.
If your HbA2 is borderline, check your iron, look at your MCV and MCH, and test your partner. If your partner is a carrier, ask for a DNA test of the beta-globin gene before deciding you're in the clear.
Things that can throw the result off
- Iron deficiency lowers HbA2 and can hide a carrier. Many labs recommend correcting iron and repeating the test, or going straight to DNA.
- A blood transfusion in the last three months mixes donor blood into the sample. Tell the lab.
- Alpha thalassemia usually doesn't show on HPLC at all. If your red cells are small, your iron is fine and HPLC is normal, ask about a DNA test for alpha-globin deletions.
HPLC vs hemoglobin electrophoresis
Both separate the hemoglobins in your blood. Capillary electrophoresis, an automated method, is about as good as HPLC and measures HbA2 accurately. Older gel electrophoresis can't measure HbA2 precisely, and some variants run together on it (HbS and HbD, for example). In India, HPLC is the most widely used. Either is fine from an accredited (NABL) lab, as long as an unclear pattern is followed up with DNA testing.
HPLC test cost in India
At private labs, the Hb HPLC test usually costs about ₹600–1,200, depending on the city and lab, based on late-2026 online price lists. Many labs sell it with a blood count (CBC) as a "thalassemia screening" package. Some government hospitals, antenatal clinics and screening camps offer it free or at low cost.
- Fasting: not needed.
- Sample: a normal blood draw.
- Results: usually within one or two days.
What two results mean together
One HPLC report tells you about you. Two tell you about your children. If both partners carry something, each pregnancy has a 1 in 4 chance of the combination below:
| Partner 1 | Partner 2 | 1 in 4 chance of |
|---|---|---|
| Beta-thalassemia trait | Beta-thalassemia trait | Thalassemia major |
| Beta-thalassemia trait | HbE trait | HbE-beta thalassemia (can be as severe as thalassemia major) |
| Beta-thalassemia trait | Sickle cell trait | Sickle beta-thalassemia |
| Sickle cell trait | Sickle cell trait | Sickle cell disease |
| Sickle cell trait | HbD Punjab trait | HbSD disease |
If you both carry something, talk to a genetic counselor before pregnancy. Options include testing a pregnancy early and IVF with embryo testing. More on every thalassemia test, or work out your odds with the carrier odds calculator.
General information, not medical advice. Ask your doctor or a genetic counselor to interpret your own report.
Sources
- Colah R et al. Global burden, distribution and prevention of β-thalassemias in India (2014)
- Modell B, Darlison M. Global epidemiology of haemoglobin disorders. Bulletin of the WHO (2008)
- β-Thalassemia mutations in subjects with borderline HbA2 values. Clinical Chemistry and Laboratory Medicine (2011)
- Medical Dialogues: Health Ministry issues national policy on thalassemia (2017)
- PharmEasy: Hemoglobin variant analysis (HPLC) test price (accessed November 2026)
- Tata 1mg Labs: Hb HPLC (Hb variants estimation) price (accessed November 2026)