The Anti-Phospholipid Antibody (APL) IgG test detects IgG autoantibodies against phospholipids, which are essential for normal blood clotting. High levels of these antibodies are strongly associated with antiphospholipid syndrome (APS), a condition that increases the risk of blood clots (thrombosis) and pregnancy complications.
✅ Diagnose Antiphospholipid Syndrome (APS)
✅ Assess risk of deep vein thrombosis (DVT), stroke, and arterial thrombosis
✅ Investigate recurrent pregnancy loss (especially after 10 weeks of pregnancy)
✅ Evaluate autoimmune disorders, particularly systemic lupus erythematosus (SLE)
| Result | Interpretation |
|---|---|
| Negative | No significant Anti-Phospholipid IgG antibodies detected |
| Low Positive | May not be clinically significant, consider repeat testing |
| Moderate to High Positive | Strongly suggests increased risk of thrombosis, pregnancy complications, or APS |
🔹 IgG APL antibodies are more clinically significant than IgM and are strongly linked to APS-related clotting disorders.
🔹 Persistent positivity (≥ 12 weeks apart) is required to confirm APS diagnosis.
Primary Antiphospholipid Syndrome (APS) → Increased risk of blood clots and pregnancy complications.
Secondary APS → Associated with systemic lupus erythematosus (SLE), rheumatoid arthritis, or other autoimmune diseases.
Unexplained Blood Clots → Deep vein thrombosis (DVT), pulmonary embolism (PE), stroke, or heart attack.
Recurrent Pregnancy Loss → Common in APS, linked to fetal growth restriction, preeclampsia, or stillbirth.
Livedo Reticularis → A lace-like skin discoloration often seen in APS.
✔ Anti-Phospholipid IgM & IgA Antibodies → IgM may be temporary, but IgG is more clinically relevant.
✔ Lupus Anticoagulant (LA) Test → Strongest predictor of clotting risk in APS.
✔ Anti-Cardiolipin Antibodies (IgG, IgM, IgA) → Commonly elevated in APS.
✔ Beta-2 Glycoprotein I Antibodies (IgG, IgM, IgA) → Highly specific for APS.
✔ Coagulation Tests (PT, aPTT, dRVVT) → Identify clotting abnormalities.
🔹 Repeat testing after 12 weeks to confirm persistence.
🔹 Assess for clotting history (DVT, stroke, PE, heart attack).
🔹 Pregnancy monitoring in women with recurrent miscarriages or preeclampsia.
🔹 Consider referral to a rheumatologist or hematologist for APS evaluation.
🔹 Anticoagulation therapy (warfarin, heparin, aspirin) may be needed if clotting risk is high.