Legionella pneumophila Antigen Detection Test: Booking, Price, and Results
About Legionella pneumophila Antigen Detection Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | Legionella urinary antigen test (LUAT), Legionnaires' disease urine test, LP urinary antigen, Legionella serogroup 1 antigen test |
| Sample Type | Urine (midstream clean-catch or catheterised specimen) |
| Fasting Required | No fasting required |
| Report Time | 4 Days |
| Recommended For | Adults and children of any gender with suspected Legionnaires' disease, particularly those with pneumonia and relevant risk factors |
| Price | Starting at ₹3,100 |
What Is the Legionella pneumophila Antigen Test ?
The Legionella pneumophila antigen test identifies a specific bacterial protein (antigen) shed by Legionella pneumophila bacteria in the urine. It is prescribed when a doctor suspects Legionnaires' disease, a type of pneumonia caused by this bacterium. The test gives a simple positive or negative result and is also known as the Legionella urinary antigen test or LUAT. A fresh urine sample is all that is needed.
What Does the Legionella pneumophila Antigen Test Measure?
This test uses immunochromatography, a method that identifies specific proteins, to look for one target in the urine sample. The table below explains what is detected.
| Parameter | What It Indicates |
|---|---|
| Legionella pneumophila serogroup 1 antigen | The presence of this antigen confirms exposure to the most common disease-causing strain of Legionella bacteria. |
The result is qualitative, meaning it reports whether the antigen is present or absent, not its quantity.
Why Is the Legionella pneumophila Antigen Test Done?
A doctor may order this test when a patient has signs of severe respiratory illness that do not respond to routine treatment. Below are the key reasons this test is requested.
Common Symptoms That May Require This Test
The following symptoms are the most common reasons a doctor would consider ordering this test:
- High fever, often exceeding 40°C
- Persistent cough, sometimes with mucus or blood
- Shortness of breath or chest pain
- Severe headache and muscle aches
- Nausea, vomiting, or diarrhoea
- Confusion or sudden changes in mental state
Conditions This Test Can Help Detect
This test helps identify several conditions linked to Legionella infection:
- Legionnaires' disease, a serious lung infection ranging from mild to life-threatening pneumonia
- Pontiac fever, a milder illness with fever, chills, and muscle aches but no lung involvement
- Community-acquired pneumonia caused by Legionella bacteria
- Hospital-acquired pneumonia caused by Legionella bacteria
How to Prepare and What to Expect
No complex preparation is needed for this test. The steps below will help you provide a suitable sample and ensure an accurate result.
Do You Need to Fast?
No fasting is required before the test. You can eat and drink normally before sample collection.
Practical Tips Before Your Test
Keep the following in mind before you collect your sample:
- Bring a detailed clinical history including your symptoms, previous test results, and any relevant medical records, as this is required for the test.
- Collect a fresh urine sample, ideally first thing in the morning or during the acute phase of illness.
- Inform your doctor if you are currently taking antibiotics, as this may affect the test result.
- Inform your doctor if you are taking diuretics (water tablets), as these can dilute urine and reduce test sensitivity.
- Use a sterile container for collection and refrigerate the sample if it cannot be submitted to the laboratory immediately.
Step-by-Step Procedure
The test procedure involves the following steps:
- Wash your hands thoroughly with soap and water before collecting the sample.
- Clean the genital area with the wipes provided, if supplied.
- Begin urinating into the toilet, then hold the sterile container in the stream to collect a midstream sample.
- Securely cap and label the container with your name and the date of collection.
- Hand the sample to the collection team or refrigerate it if there is a delay before submission.
- The sample is dispatched to the laboratory in a refrigerated condition and processed using an immunochromatography method.
Factors That Can Affect Accuracy
Several factors can influence the reliability of the result:
- Excessively bloody or cloudy urine samples may interfere with the test.
- Urine samples containing unusual dyes or unnatural colours are not acceptable.
- Recent antibiotic use may reduce the amount of antigen present in urine.
- Use of diuretics may dilute urine and lower the concentration of detectable antigen.
- Collecting the sample too early in the illness (before antigen has appeared in urine) may produce a false-negative result.
Understanding Your Legionella pneumophila Antigen Test Results
Your doctor will review your results alongside your symptoms, medical history, and any other tests ordered. The table below shows how results are generally interpreted.
| Parameter | Expected Result | What It May Mean |
|---|---|---|
| Legionella pneumophila serogroup 1 antigen | Not detected (negative) | No evidence of current or recent L. pneumophila serogroup 1 infection. |
| Legionella pneumophila serogroup 1 antigen | Detected (positive) | Current or recent infection with L. pneumophila serogroup 1 is indicated. |
A positive result suggests infection with Legionella pneumophila serogroup 1. A culture test is usually recommended to confirm the diagnosis. A negative result does not completely rule out Legionella infection, as other serogroups or species not detected by this test may also cause illness.
Disclaimer: These results are general guidelines. Your doctor will interpret them based on your age, medical history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Some circumstances can affect how results are interpreted:
Antigen can continue to be detected in urine for extended periods after treatment, sometimes for 42 days or longer. In rare cases, excretion has been documented for up to 326 days after infection. Severe illness and immunosuppression (a weakened immune system) are associated with prolonged antigen excretion.
Diuretic use may dilute urine significantly, reducing the test's ability to detect antigen even when infection is present.
How to Maintain Healthy Levels
The following general tips may help reduce exposure to Legionella bacteria:
- Avoid poorly maintained water systems such as cooling towers, hot tubs, and decorative fountains, as these are common sources of Legionella growth.
- Keep home water heaters set above 60°C, as this temperature helps inhibit bacterial growth in water tanks.
- Avoid smoking, as it increases the risk of developing Legionnaires' disease if exposed to the bacteria.
Lupin Diagnostics Legionella pneumophila Antigen Test Price and Home Collection
The test is priced starting at ₹3,100 at Lupin Diagnostics, with home sample collection available across cities. Prices may differ by location, so it is advisable to confirm the current price when booking.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 3100 |
| CHENNAI | 3100 |
| HYDERABAD | 3100 |
| KOLKATA | 3100 |
| NAVI MUMBAI | 3100 |
| PUNE | 3100 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
You can book the test online in a few simple steps:
- 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 this test across multiple cities in India. All samples are processed in NABL-accredited laboratories by experienced professionals. Digital reports are shared via email or WhatsApp for easy access.
Frequently Asked Questions
The test is the most commonly used method for diagnosing Legionnaires' disease. It helps doctors quickly determine whether a patient's pneumonia is caused by Legionella bacteria, allowing for timely and appropriate treatment decisions.
The test can detect the Legionella antigen in urine as early as three days after symptoms begin. Collecting the sample during the acute phase of illness generally gives the most accurate result.
No. A negative result means no Legionella pneumophila serogroup 1 antigen was found, but infection with other Legionella serogroups or species cannot be excluded. If symptoms persist, your doctor may recommend further tests such as a culture or PCR.
At Lupin Diagnostics, the report is typically available within 4 days of sample submission. This timeframe accounts for the specialised laboratory processing involved.
Yes. In some individuals, the antigen continues to be excreted in urine for weeks or even months after treatment. A positive result following treatment does not always mean the infection is still active. Your doctor will interpret the result in context with your clinical condition.
No. This test uses a urine sample, not blood. The urine-based test is preferred for detecting Legionella pneumophila serogroup 1 because the antigen is excreted through the kidneys and is reliably detectable in urine during active infection.
Legionella pneumophila Antigen Detection Test: Booking, Price, and Results
