Beta Thalassemia Gene Mutation Analysis

The beta thalassaemia gene mutation analysis reads the HBB gene to find the exact change behind beta thalassaemia or beta thalassaemia trait. It is usually done after a blood test has shown signs of thalassaemia, or when a family wants to know which variant they carry.

What the test looks for

Haemoglobin, the protein that carries oxygen in red blood cells, is made of alpha and beta chains. The beta chains are made from instructions in the HBB gene. Changes (variants) in HBB reduce or stop beta-chain production, which causes beta thalassaemia.

• One changed copy (trait or carrier): most people are healthy and have no symptoms, although their red cells may be smaller than usual. This is easily mistaken for iron deficiency.
• Two changed copies: this can cause beta thalassaemia intermedia or major, which needs specialist care.

The lab uses Sanger sequencing to read the gene and identify the specific variant or variants present. Knowing the exact variant matters, because different variants have different effects and because relatives can then be tested for the same change.

Who might consider it

• People whose haemoglobin electrophoresis or HPLC result suggests beta thalassaemia trait
• People with small red blood cells (low MCV) that are not explained by low iron
• Couples planning a pregnancy who want to know their carrier status, especially if one partner is already known to be a carrier
• Relatives of someone with beta thalassaemia or a known HBB variant

If you have not had a screening test yet, a beta thalassaemia screen profile or haemoglobin electrophoresis is often the first step.

Before you book

The test uses one blood sample. Our team can collect it at your home or office anywhere in Dubai, or you can visit our lab in Al Karama or Al Barsha 1. The lab asks for a signed consent form and your relevant medical history with the sample, as it does for all genetic tests. Recent blood transfusions can affect some thalassaemia blood tests, so tell us if you have had one. Results are usually ready in 15–20 days.

Understanding your results

The report lists any HBB variant found and whether one or two copies are affected.

• No variant found: beta thalassaemia caused by the variants this method detects is unlikely. If your blood tests still suggest thalassaemia, your doctor may look at alpha thalassaemia or other causes.
• One variant: you carry beta thalassaemia trait. This does not usually need treatment, but it matters for family planning.
• Two variants: your doctor or a haematologist will explain what this means for your health and care.

Beta thalassaemia is inherited. If both partners carry a variant, each pregnancy has a 1 in 4 chance that the baby inherits two changed copies. That is why carrier results are best discussed with a doctor or genetic counsellor, ideally before pregnancy, and why partners and relatives are often offered testing too.