Lupus Anticoagulant (Without DRVTT) Test: Booking, Price, and Results
About Lupus Anticoagulant (Without DRVTT) Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | LA test, LAC test, PTT-LA, Lupus Anticoagulant Panel (Without DRVVT) |
| Sample Type | Venous blood (citrated plasma) |
| Fasting Required | Not mandatory; an overnight fast is preferred |
| Report Time | 24 to 48 hours |
| Recommended For | Adults of all genders, particularly women with recurrent miscarriages or unexplained blood clots |
| Price | Starting at ₹550 |
What is a Lupus Anticoagulant (Without DRVTT) Test?
The Lupus Anticoagulant (Without DRVTT) test detects specific antibodies in the blood that can interfere with normal clotting. These antibodies, known as antiphospholipid antibodies, target proteins on cell membranes and can raise the risk of abnormal clot formation. The test is commonly ordered for people with unexplained blood clots, recurrent pregnancy loss, or suspected autoimmune conditions. A venous blood sample is used for analysis, and the test is also referred to as the LAC test or PTT-LA.
What Does a Lupus Anticoagulant (Without DRVTT) Test Measure?
This test uses a set of clotting-based methods to detect the presence of lupus anticoagulant antibodies in the blood. Rather than a single measurement, it relies on several related assessments to build a clear picture.
The following parameters are evaluated in this panel:
Activated Partial Thromboplastin Time (aPTT): Measures how long blood takes to clot via the internal clotting pathway. An unexpectedly prolonged result can indicate the presence of lupus anticoagulant.
LA-Specific aPTT (PTT-LA): A modified version of the aPTT with reduced phospholipid content, making it more sensitive to lupus anticoagulant antibodies.
Silica Clotting Time (SCT): Similar in principle to the aPTT but uses silica to activate the clotting pathway, offering an alternative method to detect the antibodies.
Mixing Studies: Patient plasma is mixed with normal plasma to determine whether a prolonged clotting time is caused by a missing clotting factor or by an inhibitor such as lupus anticoagulant.
Why is a Lupus Anticoagulant (Without DRVTT) Test Done?
Doctors order this test when a patient shows signs that suggest abnormal clotting activity or when routine clotting tests return unexpected results.
Common Symptoms That May Require This Test
The following symptoms are among the more frequent reasons a doctor may request this test:
- Unexplained blood clots in the veins or arteries
- Pain, swelling, or redness in the leg, which may suggest deep vein thrombosis (DVT)
- Shortness of breath, which may indicate a clot in the lungs (pulmonary embolism)
- Recurrent miscarriages, particularly before 24 weeks of pregnancy
- Stroke-like symptoms in a younger adult with no obvious cause
- Prolonged clotting time noticed during routine laboratory tests
- Skin discolouration with a mottled, net-like pattern (known as livedo reticularis)
Conditions This Test Can Help Detect
This test can help identify or investigate several conditions. These include:
- Antiphospholipid syndrome (APS), an autoimmune condition linked to frequent clot formation
- Deep vein thrombosis (DVT) and pulmonary embolism
- Acquired thrombophilia, where the blood has an increased tendency to clot
- Stroke or transient ischaemic attacks in younger individuals
- Systemic lupus erythematosus (SLE), an autoimmune disease where this antibody is sometimes found
- Unexplained prolonged aPTT on prior blood testing
Lupus Anticoagulant (Without DRVTT) Test During Pregnancy
The Lupus Anticoagulant (Without DRVTT) test is particularly relevant during pregnancy. Lupus anticoagulant antibodies have a strong association with recurrent miscarriage, especially before the 24th week of gestation. Medical guidelines recommend that all women with lupus be screened for antiphospholipid antibodies, including lupus anticoagulant, even if they have no previous history of pregnancy loss. Studies suggest that women who test positive for lupus anticoagulant face at least a 30% risk of adverse pregnancy outcomes despite treatment.
Lupus Anticoagulant (Without DRVTT) Test for Chronic Disease Monitoring
For patients already diagnosed with antiphospholipid syndrome, ongoing monitoring is necessary. Since lupus anticoagulant can appear transiently due to infections or medication, a positive result should be confirmed by repeat testing after 12 weeks. Patients receiving anticoagulant therapy require regular follow-up, and those who are pregnant alongside a confirmed APS diagnosis need close specialist supervision throughout.
How to Prepare and What to Expect
Preparation for this test is straightforward, though a few important steps can help ensure accurate results.
Do You Need to Fast?
Fasting is not mandatory for this test. An overnight fast is preferred but not strictly required. If your doctor has ordered additional tests alongside this one, check whether those tests carry their own fasting requirements.
Practical Tips Before Your Test
The following steps will help you prepare correctly and avoid inaccurate results:
- Inform your doctor about all medications you are currently taking, especially blood thinners such as heparin, warfarin, or direct oral anticoagulants (DOACs).
- If you are on heparin therapy, your doctor may advise stopping it at least two days before sample collection.
- Avoid warfarin before the test unless instructed otherwise, as it can affect clot detection.
- If you have recently had a blood transfusion, inform your doctor, as this may influence results.
- Wear a loose-fitting top or short sleeves on the day of collection for easy access to your arm.
Step-by-Step Procedure
The blood collection process is simple and takes only a few minutes. Here is what to expect:
- A trained phlebotomist will ask you to sit comfortably and extend your arm.
- An elastic band (tourniquet) is placed around your upper arm to make the vein more visible.
- The skin over the vein is cleaned with an antiseptic solution.
- A needle is gently inserted into a vein, usually in the inner elbow, to draw blood.
- The blood is collected into a tube containing sodium citrate, a special solution required for clotting tests.
- The needle is removed, and a small cotton swab or bandage is placed over the site. The entire procedure typically takes no longer than five minutes.
Factors That Can Affect Accuracy
Several factors may interfere with the reliability of this test. These include:
- Anticoagulant medications such as heparin, warfarin, and DOACs (which can cause false-positive or false-negative results)
- Recent infections, which may temporarily produce lupus anticoagulant antibodies
- Recent blood transfusion
- Certain medications used in cancer treatment or for infections
- Improper sample handling; the plasma sample should be processed and frozen within four hours of collection
Understanding Your Lupus Anticoagulant (Without DRVTT) Test Results
Your results will include clotting times and ratios that are compared against established reference ranges. A doctor should always review these findings in the context of your full medical history and current medications.
| Parameter | Normal Range | Unit |
|---|---|---|
| aPTT | 23.0 to 34.0 (varies by laboratory) | Seconds |
| LA-sensitive aPTT (PTT-LA) | Less than 45.7 | Seconds |
| Normalised Screen/Confirm Ratio | 0.90 to 1.20 | Ratio |
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 alter how results should be read. The following are conditions known to affect this test:
- Infections (including COVID-19): Active infections can temporarily produce lupus anticoagulant antibodies, leading to a positive result that resolves once the infection clears.
- Anticoagulant medications: Heparin can cause false-positive results, while DOACs such as apixaban may cause false-negative results in some cases. Warfarin can reduce the ability to detect subtle forms of lupus anticoagulant.
- Pregnancy: Lupus anticoagulant is more commonly detected during pregnancy, and results during this period require careful specialist interpretation.
How to Maintain Healthy Levels
The following general wellness habits support good circulatory health:
- Stay physically active with regular, moderate exercise to maintain healthy blood circulation.
- Keep well-hydrated and avoid sitting or lying still for long periods without movement.
- Attend all follow-up appointments if you have been diagnosed with antiphospholipid syndrome, so that your doctor can track your health over time.
Lupin Diagnostics Lupus Anticoagulant (Without DRVTT) Test Price and Home Collection
The Lupus Anticoagulant (Without DRVTT) test is available at Lupin Diagnostics, with home sample collection available across cities in India. Based on aggregator pricing, the test starts at approximately ₹550.
| City | Approximate Price (₹) |
|---|---|
| Mumbai | ₹550 |
| Bangalore | ₹550 |
| Chennai | ₹550 |
| Hyderabad | ₹550 |
| Kolkata | ₹550 |
| Pune | ₹550 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
Booking your Lupus Anticoagulant (Without DRVTT) test is simple:
- 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 24 to 48 hours.
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 trained professionals. Once your report is ready, you can access it digitally via email or WhatsApp.
Frequently Asked Questions
Current international guidance recommends testing for lupus anticoagulant using at least two methods based on different principles, with aPTT-based tests and dilute Russell viper venom time (dRVVT) commonly used together. The 'Without DRVVT' version uses only aPTT-based methods, such as PTT-LA and Silica Clotting Time, and does not include the dRVVT component. Your doctor will determine which testing approach is most appropriate for your clinical situation.
No. A positive Lupus Anticoagulant (Without DRVTT) test does not mean you have lupus, the autoimmune disease. These antibodies can occur in people without lupus and are primarily associated with an increased risk of blood clot formation. Your doctor will interpret the result together with your symptoms, medical history, and other laboratory findings.
A single positive test result is not enough to confirm antiphospholipid syndrome. Lupus anticoagulant antibodies may appear temporarily due to infections, medications, or other transient conditions. Repeating the test after at least 12 weeks helps determine whether the antibodies are persistent, which is an important diagnostic requirement.
You should not stop or adjust anticoagulant medications such as heparin or warfarin without consulting your doctor. These medications can affect lupus anticoagulant testing and may lead to inaccurate results. Your healthcare provider will advise whether any medication adjustments are needed before sample collection.
Yes. Women with lupus, recurrent pregnancy loss, or a history of pregnancy complications may be advised to undergo antiphospholipid antibody screening, which includes the Lupus Anticoagulant (Without DRVTT) test. Early detection allows doctors to provide appropriate monitoring and management throughout pregnancy.
A negative result indicates that lupus anticoagulant was not detected in the blood sample at the time of testing. This generally suggests a lower likelihood of lupus anticoagulant-related clotting complications. However, it does not completely rule out antiphospholipid syndrome because other antiphospholipid antibodies may still be present. Additional testing may be recommended if clinical suspicion remains high.
Lupus Anticoagulant (Without DRVTT) Test: Booking, Price, and Results
