Description of the blood test:

Cardiolipin is a specific type of phospholipid (a fatty molecule) found in the membranes of cells and mitochondria. Anti-Cardiolipin IgG antibodies are autoantibodies produced by the immune system that mistakenly target these phospholipids. When these antibodies bind to cell surfaces, they interfere with the blood’s natural balance, leading to an increased risk of blood clots. This test is one of the three “gold standard” laboratory markers used to diagnose Antiphospholipid Syndrome (APS), an autoimmune condition often linked to systemic lupus or occurring on its own.

What Does the Test Represent?

• Goal: To detect and measure the concentration of IgG-class antibodies against cardiolipin.
• Main Application: Evaluating the risk of venous and arterial thrombosis (blood clots) and investigating the causes of recurrent pregnancy loss.
• Method: Enzyme-Linked Immunosorbent Assay (ELISA) or Chemiluminescence Immunoassay (CLIA).

Collection Recommendations (General)

• Timing: It is recommended to have blood drawn in the morning.
• Fasting: Overnight fasting (8–12 hours) is preferred; plain water is allowed.
• Material: Venous blood (serum).
• Specific Rules: Avoid heavy physical exertion and alcohol for 24 hours before the test. Inform your physician if you are currently on anticoagulant therapy, although this does not change the antibody level itself.

Factors Influencing the Result

• Transient Positivity: These antibodies can temporarily appear during acute infections (such as syphilis, malaria, or viral respiratory infections). To confirm a chronic autoimmune condition, the test must be positive twice, at least 12 weeks apart.
• Age: Low levels of Anti-Cardiolipin antibodies are occasionally found in healthy elderly individuals.
• Subclass Significance: The IgG subclass is generally considered more strongly associated with clinical events (clots and pregnancy complications) than the IgM or IgA subclasses.

When to Take This Test?

• Recommendations: If you have had an unexplained blood clot (like a DVT or pulmonary embolism), a stroke or heart attack at a young age, or pregnancy complications such as recurrent miscarriages or premature birth due to eclampsia.
• Importance: Identifying these antibodies allows doctors to implement preventative measures to reduce the risk of future, potentially life-threatening vascular events.

Medical Interpretation

• Crucial Note: A single positive result is not a diagnosis of APS. Diagnosis requires a combination of clinical symptoms and persistent laboratory results. Only a specialist can “fine-tune” these results by correlating them with your medical history and other clotting markers.
• High-Positive Result (>40 GPL units): Indicates a significant risk for thrombosis and is a strong diagnostic indicator for Antiphospholipid Syndrome.
• Low-to-Medium Positive: May be seen in other autoimmune diseases like Systemic Lupus Erythematosus (SLE) or as a temporary reaction to infection.

Possible Further Investigations

• Anti-Cardiolipin IgM: Often tested together to provide a full antibody profile.
• Anti-Beta-2 Glycoprotein I (IgG and IgM): Another mandatory marker for APS.
• Lupus Anticoagulant: A functional test to measure how these antibodies affect blood clotting time.
• ANA (Antinuclear Antibody): To check for underlying systemic autoimmune disorders.
• Consultation with a Rheumatologist or Hematologist.

When Does the Next Step Make Sense?

• If the result is positive, the mandatory next step is a repeat test after 12 weeks to confirm the persistence of the antibodies. If confirmed, the focus shifts to long-term management of clotting risks, especially during high-risk periods like surgery or pregnancy.
• All clinical decisions must be made by a healthcare professional based on the persistence of the antibody and the patient’s individual history of vascular events.

👉 If necessary, you can discuss the analysis results with a specialist such as a rheumatologist (Doctors – TAMC) or hematologist (Doctors – TAMC).