Anti-Phospholipid Antibody (APA) IgG Test
About Anti-Phospholipid Antibody (APA) IgG Test
| Field | Value |
|---|---|
| Also Known As | APA IgG, Antiphospholipid Antibody IgG, Anticardiolipin IgG, APLA IgG, Anti-Phospholipid IgG Antibody Test |
| Sample Type | Venous blood (serum) |
| Fasting Required | No fasting needed; eat and drink normally |
| Report Time | Within 24 to 48 hours (may vary by laboratory) |
| Recommended For | Adults of any gender; commonly ordered for women with recurrent pregnancy loss and individuals with unexplained blood clots |
| Price | Starting at ₹480 |
What Is an Anti-Phospholipid Antibody (APA) IgG Test?
The anti-phospholipid antibody (APA) IgG test is a blood test that detects a specific type of immune protein called immunoglobulin G (IgG) in your bloodstream. These proteins, known as antiphospholipid antibodies, mistakenly target fat molecules found in cell membranes. Doctors order this test when they suspect a condition called antiphospholipid syndrome (APS) or when investigating unexplained blood clots and pregnancy complications. The test is also referred to as the antiphospholipid antibody IgG test, anticardiolipin IgG test, or APLA IgG test.
What Does an Anti-Phospholipid Antibody (APA) IgG Test Measure?
This test looks for a particular class of autoantibodies, which are immune proteins the body produces against its own tissues. Antiphospholipid antibodies bind to plasma proteins such as β2-glycoprotein I and prothrombin, which naturally attach to phospholipids (fat molecules in cell membranes). The following table outlines what the test analyses.
| Parameter | What It Measures | Why It Matters |
|---|---|---|
| Antiphospholipid Antibody IgG | Level of IgG-class antiphospholipid antibodies in blood | IgG antibodies are most closely linked to blood clots and pregnancy complications; they correlate better with clinical symptoms than IgM or IgA types |
Why Is an Anti-Phospholipid Antibody (APA) IgG Test Done?
Your doctor may request this test for several reasons, from evaluating unexplained clotting events to investigating repeated pregnancy losses.
Common Symptoms That May Require This Test
The following symptoms are among the most common reasons a doctor may order an APA IgG blood test:
- Swelling, pain, or redness in the leg, which may suggest a blood clot (deep vein thrombosis)
- Unexplained stroke, particularly in younger individuals
- Recurrent miscarriages or stillbirths
- Skin colour changes or a lace-like skin rash
- Persistent headaches or migraines
Conditions This Test Can Help Detect
This test can assist in identifying several conditions. These include:
- Antiphospholipid syndrome (APS), an autoimmune disorder where persistent antibodies cause blood clots or pregnancy problems
- Systemic lupus erythematosus (SLE, or lupus), as approximately 50% of people with lupus carry these antibodies
- Deep vein thrombosis (DVT) and pulmonary embolism (a blood clot in the lungs)
- Pregnancy-related complications such as recurrent miscarriages and preeclampsia (high blood pressure during pregnancy)
- Catastrophic antiphospholipid syndrome (CAPS), a rare but serious complication
Anti-Phospholipid Antibody (APA) IgG Test During Pregnancy
The antiphospholipid antibody IgG test is an important part of the investigation for women with a history of pregnancy loss. Around 10 to 15% of women with recurrent miscarriage are diagnosed with antiphospholipid syndrome. Pregnancy loss at 10 weeks or later is particularly associated with the presence of these antibodies. Women with a history of repeated miscarriages or other pregnancy complications are routinely tested for antiphospholipid antibodies.
How to Prepare and What to Expect
No special preparation is needed for this test. However, there are a few practical points worth knowing before you go.
Do You Need to Fast?
No, fasting is not required. You can eat and drink as normal before the test. If your doctor has ordered additional tests alongside this one, ask whether any of those require fasting.
Practical Tips Before Your Test
- Tell your doctor about all medications you currently take, especially blood thinners (anticoagulants), as blood should ideally be collected before anticoagulation therapy begins or after an adequate gap following its discontinuation
- Drink enough water before the test to make the blood draw easier
- Wear a loose-fitting top or a top with sleeves that roll up easily
- Avoid strenuous physical activity immediately before collection
Step-by-Step Procedure
- A trained phlebotomist cleans your skin with an antiseptic wipe at the collection site, usually the inside of the elbow.
- A tourniquet (a light band) is wrapped around your upper arm to make the vein easier to locate.
- A small needle is used to collect a blood sample from the vein; this takes only a few seconds.
- The collected sample is stored safely and transported to the laboratory for analysis.
- In the lab, an ELISA (enzyme-linked immunosorbent assay) technique is used to detect antiphospholipid IgG antibodies in your sample.
- Pressure is applied to the puncture site, followed by a small bandage. You can resume normal activities right away.
Factors That Can Affect Accuracy
- A history of syphilis or certain other infections may cause a false positive result
- Anticoagulant medications such as warfarin or direct oral anticoagulants can affect test readings
- Temporary antibodies caused by recent infections, certain medicines, or underlying cancer can produce a positive result that does not indicate APS
- Sample handling and processing quality at the time of collection
Understanding Your Anti-Phospholipid Antibody (APA) IgG Test Results
Results from this test are read against standard reference ranges and should always be reviewed with your doctor. The table below gives an overview of what different result levels generally mean.
| Result | Level (GPL U/mL) | General Meaning |
|---|---|---|
| Negative | Less than 10 | No detectable IgG antiphospholipid antibodies; lower risk for APS-related complications |
| Weak Positive | 10 to 40 | Low-level antibodies present; may be temporary or require follow-up |
| Positive | Above 40 | Significant antibody levels; associated with increased risk of blood clots and pregnancy complications |
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.
Note: Reference ranges can vary between laboratories depending on the method used. Some assays use a cut-off of 12 GPL U/mL for a negative result. Results from different laboratories may not be directly comparable.
Results During Special Conditions
Certain situations can affect how results are read: People with a history of syphilis may receive a false positive result, as some tests cannot fully distinguish between APS-related antibodies and those produced in response to infection. Pregnancy itself can alter immune responses, so the timing of testing matters and your doctor will advise when it is most appropriate. Anticoagulation medicines, including warfarin and other direct oral anticoagulants, may affect related clotting measurements taken alongside this test.
How to Maintain Healthy Levels
These general wellness tips support overall circulatory health:
- Stay well hydrated throughout the day; dehydration increases the risk of blood clots.
- Avoid prolonged periods of immobility, such as sitting for many hours on a flight or during bed rest; try to move regularly.
- Maintain a balanced diet, a healthy weight, and an active lifestyle, and avoid smoking, all of which support healthy blood flow.
Lupin Diagnostics Anti-Phospholipid Antibody (APA) IgG Test Price and Home Collection
The anti-phospholipid antibody (APA) IgG test price across India typically starts at around ₹480, with costs varying by city. Lupin Diagnostics offers home sample collection, so you do not need to visit a centre if this is more convenient.
| City | Approximate Price (₹) |
|---|---|
| Bangalore | ₹1,400 |
| Hyderabad | ₹1,400 |
| Mumbai | ₹900 |
| Chennai | ₹1,400 |
| Kolkata | ₹900 |
Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the test on the Lupin Diagnostics website or app.
- 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 the APA IgG test across cities, making it easy to get tested without travelling. All samples are processed in NABL-accredited laboratories by experienced professionals. Your digital report is shared via email or WhatsApp once ready.
Frequently Asked Questions
The APA IgG test measures IgG-class antiphospholipid antibodies in your blood. It helps doctors investigate unexplained blood clots, recurrent miscarriages, and autoimmune conditions such as lupus. A positive result may support a diagnosis of antiphospholipid syndrome.
A single positive result does not confirm antiphospholipid syndrome. The antibodies must be found on at least two occasions, at least 12 weeks apart, to confirm they are persistent rather than temporary. Temporary antibodies can occur after infections or with certain medicines and do not indicate APS.
Yes. Some people carry antiphospholipid antibodies without ever developing symptoms or complications. A diagnosis of antiphospholipid syndrome is made only when these antibodies are linked to a clinical event such as a blood clot or pregnancy loss.
IgG antibodies are more closely linked to symptoms and complications than IgM antibodies. Levels above 40 GPL units are associated with an increased risk of clotting events. However, doctors often order both IgG and IgM tests together for a fuller picture.
APS is now recognised as the most common treatable cause of recurrent miscarriage. At least 15% of recurrent miscarriages are linked to this condition. With the right diagnosis and care, pregnancy success rates have improved significantly in recent decades.
No fasting is needed. You can eat and drink normally before your sample is collected. Simply inform your doctor about any medications you are taking, particularly blood thinners, before the test.
A positive result should be discussed with your doctor promptly. They will likely arrange a repeat test after 12 weeks to confirm persistence of the antibodies. Additional investigations, such as a lupus anticoagulant test or anti-β2 glycoprotein I antibody test, may also be ordered. Your doctor will guide the next steps based on your full clinical history.
Anti-Phospholipid Antibody (APA) IgG Test
