Understanding the Lupus Anticoagulant Test
Learn about the lupus anticoagulant test, its purpose in detecting clotting disorders, the procedure, and how results help diagnose autoimmune and blood-related conditions.
Written by Dr. Vasanthasree Nair
Reviewed by Dr. D Bhanu Prakash MBBS, AFIH, Advanced certificate in critical care medicine, Fellowship in critical care medicine
Last updated on 26th Aug, 2025
If you or a loved one has been advised to take a Lupus Anticoagulant (LA) test, you might have questions about what it means and why it’s needed. Don’t worry—this guide will help you understand the test in simple terms, why it’s important, and what you can expect.
What Is the Lupus Anticoagulant Test?
The Lupus Anticoagulant (LA) test is a blood test that checks for certain antibodies that can increase the risk of abnormal blood clotting. Despite its name, it is not directly related to lupus (an autoimmune disease), though people with lupus may sometimes have these antibodies.
This test is mainly used to:
Diagnose antiphospholipid syndrome (APS), a condition that causes blood clots.
Investigate unexplained blood clots or recurrent miscarriages.
Monitor patients with autoimmune disorders.
Consult a Top Specialist
Why Is This Test Important?
Normally, blood clots help stop bleeding when you’re injured. However, if your blood clots too easily, it can block blood vessels, leading to serious problems like:
Deep vein thrombosis (DVT) (clots in legs)
Pulmonary embolism (PE) (clots in lungs)
Stroke or heart attack
Recurrent miscarriages (in pregnant women)
The LA test helps doctors identify if these antibodies are causing clotting issues so they can provide the right treatment.
Who Should Get Tested?
Your doctor may recommend this test if you have:
Unexplained blood clots.
A history of multiple miscarriages.
An autoimmune disease like lupus.
A family history of clotting disorders.
Prolonged aPTT (activated partial thromboplastin time) in previous blood tests.
How Is the Test Done?
The test involves a simple blood draw, usually from a vein in your arm. No special preparation is needed, but inform your doctor if you’re taking blood thinners (like warfarin or heparin), as they can affect results.
Understanding Your Results
Negative Result: No lupus anticoagulant detected.
Positive Result: Lupus anticoagulant is present, increasing clotting risk.
A positive result doesn’t always mean you’ll develop clots, but your doctor may suggest further tests or preventive treatments.
Managing a Positive Result
If your test is positive, your doctor may recommend:
Blood thinners (anticoagulants) to prevent clots.
Regular monitoring if you have autoimmune conditions.
Lifestyle changes to reduce clotting risks, such as:
Staying active to improve circulation.
Avoiding long periods of sitting.
Eating a heart-healthy diet (low in saturated fats).
Quitting smoking.
When to See a Doctor
If you experience:
Swelling, pain, or redness in your legs (possible DVT).
Sudden shortness of breath or chest pain (possible PE).
Frequent miscarriages.
Unexplained strokes at a young age.
Consult a doctor immediately. Early detection and treatment can prevent complications.
Book a Test or Consultation with Apollo 24|7
If your doctor has recommended a Lupus Anticoagulant test, you can easily book it through Apollo 24|7. Their expert team ensures accurate testing and timely reports. You can also consult a hematologist or rheumatologist for further guidance.
Final Thoughts
While a positive Lupus Anticoagulant test can be concerning, proper medical care and lifestyle changes can help manage the risks effectively. Always follow your doctor’s advice and stay informed about your health. If you have any concerns about clotting disorders or related symptoms, don’t hesitate to reach out to a healthcare provider. Your well-being matters!
Consult a Top Specialist
Consult a Top Specialist
Dr. Pinaki Mukhopadhyay
General Physician/ Internal Medicine Specialist
32 Years • MBBS
Kolkata
MCR SUPER SPECIALITY POLY CLINIC & PATHOLOGY, Kolkata
(25+ Patients)
Dr. Swagata Sircar
General Physician/ Internal Medicine Specialist
8 Years • MBBS, MD General Medicine
Kolkata
HealthYou Speciality Clinic & Diagnostics., Kolkata
Dr. Divyashree K
General Physician/ Internal Medicine Specialist
5 Years • MBBS
Bengaluru
Apollo Clinic, JP nagar, Bengaluru
Dr. Smitha Nagaraj
General Physician/ Internal Medicine Specialist
15 Years • MBBS, Diploma in Family Medicine
Bengaluru
Apollo Medical Center, Marathahalli, Bengaluru
Dr. Gunashree V L
General Physician/ Internal Medicine Specialist
3 Years • MBBS
Bengaluru
Apollo Clinic, JP nagar, Bengaluru
