Beta Thalassemia-HBB Full Gene Analysis (Couple) Test
About Beta Thalassemia-HBB Full Gene Analysis (Couple) Test
| Field | Value |
|---|---|
| Also Known As | HBB Full Gene Sequencing (Couple), Beta Globin Gene Analysis (Couple), Beta Thalassaemia Carrier Screening (Couple), HBB Couple Test |
| Sample Type | Peripheral blood (EDTA tube, 2 ml per person) |
| Fasting Required | No fasting required |
| Report Time | 20 days |
| Recommended For | Adults of reproductive age, couples planning pregnancy, family members of thalassaemia carriers |
| Price | Starting at ₹15,000 |
What is a Beta Thalassemia-HBB Full Gene Analysis (Couple) Test?
The Beta Thalassemia-HBB Full Gene Analysis (Couple) test examines the HBB gene in both partners to identify mutations that could cause beta thalassaemia in their children. The HBB gene carries instructions for making beta-globin, a key component of haemoglobin (the protein in red blood cells that carries oxygen). This test is also known as HBB Full Gene Sequencing or Beta Globin Gene Analysis. It uses a peripheral blood sample from each partner and is analysed using Sanger sequencing, a precise DNA-reading technique.
What Does a Beta Thalassemia-HBB Full Gene Analysis (Couple) Test Measure?
This test reads the entire HBB gene sequence in both partners to identify changes (mutations) that affect beta-globin production. The following aspects are analysed:
| What is Analysed | Why it Matters |
|---|---|
| HBB gene mutations (missense, nonsense, splice site) | Identifies specific changes that disrupt normal beta-globin production |
| Beta-globin production variants (β+ and β0) | Determines whether beta-globin is reduced or completely absent |
| Point mutations, small deletions, and insertions | Detects the most common causes of beta thalassaemia |
| Haemoglobin variants (hyper-unstable, dominant) | Identifies rarer forms of beta-globin abnormalities |
| Compound haemoglobinopathies (e.g., HbE/beta thalassaemia) | Flags conditions arising from combinations of mutations |
Why is a Beta Thalassemia-HBB Full Gene Analysis (Couple) Test Done?
Couples planning a family may be advised to undergo this test for several reasons, from a family history of thalassaemia to abnormal routine blood results.
Common Symptoms That May Require This Test
The following situations or symptoms often prompt a doctor to recommend this test:
- Family history of thalassaemia or known carrier status in either partner
- Unexplained microcytic anaemia (smaller-than-normal red blood cells)
- Persistent fatigue and pallor not explained by iron deficiency
- Shortness of breath with no clear cardiac or respiratory cause
- Abnormal haemoglobin electrophoresis or HPLC results
- Planning pregnancy, particularly in communities with higher carrier rates
- Abnormal findings in a previous routine blood count
Conditions This Test Can Help Detect
The Beta Thalassemia-HBB Full Gene Analysis test can help identify the following conditions:
- Beta thalassaemia major (Cooley's anaemia), the most severe form, requiring lifelong blood transfusions
- Beta thalassaemia intermedia, which causes mild to moderate symptoms
- Beta thalassaemia minor (beta thalassaemia trait), which may cause little or no symptoms
- Hyper-unstable haemoglobin variants and dominant beta thalassaemia variants
- Sickle cell-beta thalassaemia compound conditions
- HbE/beta thalassaemia and other compound haemoglobinopathies
Beta Thalassemia-HBB Full Gene Analysis (Couple) Test During Pregnancy
This test is recommended for individuals who are pregnant or planning to become pregnant, along with their partner. When both partners are confirmed carriers, each pregnancy carries a 25% chance of the child having beta thalassaemia major, a 50% chance of the child being a carrier, and a 25% chance of the child having normal HBB genes. Medical guidelines recommend that couples planning a family be offered carrier screening for inherited conditions, including beta thalassaemia, as early as possible to allow time for informed decisions.
How to Prepare and What to Expect
No special preparation is needed for this test, but a few practical steps can make the process smoother for both partners.
Do You Need to Fast?
No. Fasting is not required before this test. Both partners can eat and drink normally before sample collection.
Practical Tips Before Your Test
The following steps will help ensure a smooth experience and accurate results:
- Both partners should get tested at the same time for a complete risk assessment
- Inform the laboratory if either partner has had a recent blood transfusion, as this can affect DNA quality
- Bring a detailed clinical history, including symptoms, previous test results, and family history, as this is required for the test
- Carry any previous haemoglobin electrophoresis or HPLC reports if available
- Wear a short-sleeved or loose-sleeved top for easy access to the arm
Step-by-Step Procedure
Both partners undergo a simple blood draw. Here is what to expect:
- A trained phlebotomist (blood collection specialist) cleans the inner elbow area of the first partner with an antiseptic wipe.
- An elastic band is tied around the upper arm to make the veins more visible; the partner is asked to make a fist gently.
- A needle is inserted into a vein, and approximately 2 ml of blood is collected into an EDTA tube (a standard purple-top blood collection tube).
- The same process is then carried out for the second partner.
- Both tubes are labelled with each person's name, registration number, and date of collection, and stored at refrigeration temperature (2 to 8 degrees Celsius) for transport to the laboratory.
- In the laboratory, DNA is extracted from the blood, the HBB gene is amplified using PCR (a method that copies a specific section of DNA), and the gene sequence is read in both directions using Sanger sequencing.
Factors That Can Affect Accuracy
The following factors may affect the reliability of results:
- Recent blood transfusions, which can introduce donor DNA into the sample
- Sample haemolysis (breakdown of red blood cells during collection or transport)
- Incorrect sample labelling or improper storage temperature
- Prior haematopoietic stem cell (bone marrow) transplant from a donor, which interferes with the patient's own DNA
- Mosaic variants, large gene deletions, large duplications, or deep intronic variants are not reliably detected by this method
Understanding Your Beta Thalassemia-HBB Full Gene Analysis (Couple) Test Results
Results indicate whether either or both partners carry mutations in the HBB gene. The table below shows how results are generally interpreted.
| Parameter | Finding | Interpretation |
|---|---|---|
| HBB gene sequence (both partners) | No pathogenic variants detected | Non-carrier; low reproductive risk for beta thalassaemia |
| HBB gene sequence (one partner) | One pathogenic variant detected (heterozygous) | Carrier (beta thalassaemia trait); further partner testing is essential |
| HBB gene sequence (one partner) | Two pathogenic variants detected (homozygous or compound heterozygous) | Affected individual; genetic counselling recommended |
| Both partners | Pathogenic variants detected in each | 25% risk per pregnancy of an affected child; genetic counselling advised |
Disclaimer: These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain situations can affect how results are interpreted:
- Partners who have received a haematopoietic stem cell (bone marrow) transplant from a donor may have mixed DNA, making results unreliable.
- Recent blood transfusions may reduce the accuracy of DNA extraction.
- This method does not detect large gene deletions, duplications, inversions, or deep intronic variants. Additional testing may be required in some cases.
How to Maintain Healthy Levels
The following general steps are relevant after receiving results:
- Couples identified as carriers should speak with a genetic counsellor before planning a pregnancy.
- If both partners are carriers, prenatal diagnosis options such as CVS (chorionic villus sampling) or amniocentesis can be discussed with a doctor.
- Maintain a diet rich in folate; avoid taking iron supplements unless specifically recommended by a doctor.
Lupin Diagnostics Beta Thalassemia-HBB Full Gene Analysis (Couple) Test Price and Home Collection
The Beta Thalassemia-HBB Full Gene Analysis (Couple) test is available at Lupin Diagnostics starting at ₹15,000, with home sample collection available for both partners.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 9600 |
| CHENNAI | 9600 |
| HYDERABAD | 9600 |
| KOLKATA | 9600 |
| NAVI MUMBAI | 9600 |
| PUNE | 9600 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Here is how to book your Beta Thalassemia-HBB Full Gene Analysis test online:
- Select the test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Lupin Diagnostics offers home collection for this test across multiple cities, so both partners can provide their samples from the comfort of home. All samples are processed in NABL-accredited laboratories by experienced molecular diagnostics teams. Digital reports are delivered securely via email or WhatsApp.
Frequently Asked Questions
The Beta Thalassemia-HBB Full Gene Analysis (Couple) test reads the entire HBB gene in both partners to find mutations that could cause beta thalassaemia in their children. It helps couples understand their reproductive risk before or during pregnancy. The test uses a peripheral blood sample from each partner.
Testing both partners at the same time gives a complete picture of the couple's reproductive risk. If only one partner is tested and found to be a carrier, the risk to children cannot be fully assessed without knowing the other partner's carrier status. Simultaneous testing saves time and enables faster decision-making.
If both partners carry an HBB gene mutation, each pregnancy has a 25% chance of resulting in a child with beta thalassaemia major. A genetic counsellor will explain the options available, including prenatal testing methods such as CVS or amniocentesis.
Beta thalassaemia is one of the most common single-gene disorders in India, with a carrier prevalence of around 3 to 4% in the general population. In certain communities, such as Sindhis, Muslims, Cutchi Bhanushalis, and some tribal groups, carrier rates can be 8 to 10% or higher. This makes the HBB Full Gene Sequencing (Couple) test particularly relevant for Indian couples.
The Beta Thalassemia-HBB Full Gene Analysis test procedure detects more than 90% of known beta thalassaemia mutations, including point mutations, small deletions, and insertions. However, large gene deletions, duplications, and certain rare variants located outside the HBB gene are not detectable by this method. Your doctor or genetic counsellor can advise if additional tests are needed.
The test requires a simple blood draw from a vein in the arm. Most people experience only brief, mild discomfort similar to a routine blood test. The entire collection process takes only a few minutes for each partner.
Ideally, the Beta Thalassemia-HBB Full Gene Analysis (Couple) test should be done before pregnancy (pre-conceptional screening). This gives couples the most time to understand their results, seek genetic counselling, and consider their options. It can also be done in early pregnancy if pre-conception screening was not carried out.
Beta Thalassemia-HBB Full Gene Analysis (Couple) Test
