Galactose (Classical) Transferase, Blood Test: Booking, Price, and Results
About Galactose (Classical) Transferase, Blood Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | GALT Test, Galactose-1-Phosphate Uridyltransferase Test, GALT Enzyme Test, GALT Blood Test |
| Sample Type | Whole blood |
| Fasting Required | No fasting required |
| Report Time | 7 days |
| Recommended For | Newborns, infants, and individuals of any age with suspected galactosemia or a family history of the condition |
| Price | Starting at ₹2,400 |
What Is a Galactose (Classical) Transferase, Blood Test?
The Galactose (Classical) Transferase, Blood test measures the activity of an enzyme called galactose-1-phosphate uridyltransferase (GALT) in the blood. This enzyme plays a key role in breaking down galactose, a sugar found in milk and dairy products.
When GALT enzyme activity is absent or very low, galactose builds up in the body, causing a condition called galactosemia. The test is also known as the GALT test or the GALT Enzyme Test, and it uses a whole blood sample drawn from a vein.
What Does a Galactose (Classical) Transferase, Blood Test Measure?
This test analyses a single key component in the blood. The table below explains what it looks for and why it matters.
| Parameter | What It Tells Us |
|---|---|
| GALT enzyme activity | Shows how well the body can process galactose (a milk sugar). Low activity suggests the body cannot break down galactose efficiently. |
Why Is a Galactose (Classical) Transferase, Blood Test Done?
Doctors order the Galactose Transferase test for several reasons, most often to investigate symptoms in newborns or to confirm abnormal results from newborn screening programmes.
Common Symptoms That May Require This Test
A doctor may recommend this test when the following signs are present, particularly in a newborn or young infant:
- Poor feeding or repeated vomiting after consuming milk
- Unusual tiredness or lack of alertness (lethargy)
- Failure to gain weight normally (failure to thrive)
- Jaundice (yellowing of the skin and eyes)
- Unexplained liver problems
- Abnormal bleeding or bruising
Conditions This Test Can Help Detect
The GALT Blood test can help identify the following conditions:
- Classic galactosemia (complete or near-complete absence of GALT enzyme activity)
- Duarte galactosemia (partial GALT deficiency, typically about 25% of normal enzyme activity)
- Clinical variant galactosemia
- Carrier status for a GALT gene variant (one working copy of the gene)
- Confirmation of abnormal results from a newborn screening programme
How to Prepare and What to Expect
No special preparation is needed before the Galactose Transferase test procedure. The steps are straightforward and the test causes minimal discomfort.
Do You Need to Fast?
No, fasting is not required before this test. You or your child can eat and drink normally beforehand.
Practical Tips Before Your Test
- Bring a detailed clinical history, including symptoms, previous test results, and any relevant family history, as this is required for the test.
- Tell your doctor about all medications currently being taken, as some can affect results.
- Inform the doctor if you or your child has recently had a blood transfusion, as this can interfere with the test for up to four months.
- Avoid exposing the collected sample to heat; it must be kept refrigerated during transport.
- For newborns, this test is often done as a follow-up to an abnormal newborn screening result.
Step-by-Step Procedure
Here is what happens during the Galactose Transferase test procedure:
- A trained phlebotomist identifies a suitable vein, usually in the arm. For newborns, a heel prick may be used.
- The puncture site is cleaned with an antiseptic swab to reduce the risk of infection.
- A small blood sample of approximately 3 ml is drawn into a green-top sodium heparin tube.
- The tube is gently inverted several times to mix the blood with the anticoagulant inside.
- The labelled sample is stored at 2 to 8 degrees Celsius and transported refrigerated to the laboratory.
- The sample is analysed using a fluorometry method, and results are typically available within 7 days.
Factors That Can Affect Accuracy
- A recent blood transfusion (within the past four months) can cause a falsely normal result, as donor enzyme activity may be detected
- Improper sample storage or exposure to high temperatures or humidity can cause enzyme breakdown, potentially leading to an inaccurate result
- Delays in processing the sample beyond three days of collection may also affect accuracy
- The patient's age is needed for correct interpretation of results
Understanding Your Galactose (Classical) Transferase, Blood Test Results
Your results will show the level of GALT enzyme activity in your blood. Below is a general reference guide. Always review results with your doctor, who can place them in the context of your full health history.
| Parameter | Normal Range | Possible Concern |
|---|---|---|
| GALT enzyme activity | 24.5 nmol/h/mg of hemoglobin or above (equivalent to 19.4 U/g Hb or above) | Below normal range may indicate galactosemia or carrier status |
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
- A blood transfusion within the past four months may produce a false-negative result, as the GALT enzyme from donor red blood cells remains detectable. In such cases, DNA analysis or metabolite measurement may be a more appropriate alternative.
- Improper specimen storage at high temperatures or humidity can reduce enzyme activity in the sample, potentially producing a false-positive result. Correct refrigeration of the sample from collection to laboratory is essential.
How to Manage GALT Deficiency
Galactosemia is a genetic condition, so lifestyle changes cannot raise or restore GALT enzyme activity. However, these general points are relevant for those affected:
- If GALT deficiency is confirmed, strict avoidance of milk, dairy products, and other galactose-containing foods is the primary way to manage the condition
- Regular follow-up with a metabolic specialist helps monitor long-term health outcomes
- Genetic counselling is recommended for affected individuals and their families to understand inheritance patterns
Lupin Diagnostics Galactose (Classical) Transferase, Blood Test Price and Home Collection
The Galactose Transferase test cost at Lupin Diagnostics starts at ₹2,400, and home collection is available across cities. The table below lists indicative prices by location.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 2400 |
| CHENNAI | 5000 |
| HYDERABAD | 2400 |
| KOLKATA | 2400 |
| NAVI MUMBAI | 2400 |
| PUNE | 2400 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Follow these steps to book the Galactose Transferase test online booking:
- 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 sample collection for the Galactose Transferase test home collection service across multiple cities. All samples are processed in NABL-accredited laboratories by qualified professionals. Digital reports are delivered via email or WhatsApp, making it easy to share results with your doctor.
Frequently Asked Questions
This test is used to diagnose classic galactosemia by measuring GALT enzyme activity in the blood. It helps doctors confirm whether the body can break down galactose properly. It is also used to confirm abnormal results from newborn screening programmes.
The GALT test is primarily recommended for newborns and infants showing symptoms such as poor feeding, jaundice, vomiting, or poor weight gain. It may also be ordered for older individuals with a known family history of galactosemia or for those whose newborn screening results were abnormal.
No fasting is needed before this test. You or your child can eat and drink normally on the day of sample collection. No other special preparation is required beyond bringing the necessary clinical history.
Yes, it can. If you or your child has had a blood transfusion in the past four months, the donor's GALT enzyme activity may still be detectable in the blood. This can produce a falsely normal result. Inform your doctor before the test so they can consider alternative testing methods if needed.
Results for the Galactose (Classical) Transferase, Blood test are typically available within 7 days of sample collection. You will receive your report digitally via email or WhatsApp.
Very low GALT activity suggests classic galactosemia, a condition where galactose accumulates in the body. If left unmanaged, this can lead to serious complications, including liver problems, developmental delays, and other long-term health issues. Your doctor will guide next steps, which may include dietary changes and specialist referrals.
Even with early dietary management, individuals with galactosemia can be at risk for developmental delays, speech difficulties, and problems with motor function over time. Females may also be at increased risk for premature ovarian insufficiency. Regular monitoring by a metabolic specialist is important for long-term wellbeing.
Galactose (Classical) Transferase, Blood Test: Booking, Price, and Results
