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Medically Reviewed By

Dr. Srinivas

Consultant Pathologist

Pathology · Last reviewed: June 2026

Anti-Cardiolipin Antibody IgM blood test for diagnosing Antiphospholipid Syndrome (APS) and autoimmune clotting disorders at Focus Diagnostics

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ANTI CARDIOLIPIN AB IGM

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About this test

The Anti-Cardiolipin Antibody (IgM) Test is a specialized blood test used to detect Immunoglobulin M (IgM) antibodies against cardiolipin, a phospholipid found in cell membranes. These antibodies are one of the key laboratory markers used in diagnosing Antiphospholipid Syndrome (APS), an autoimmune disorder that increases the risk of abnormal blood clot formation.

The Anti-Cardiolipin IgM Test helps physicians investigate unexplained blood clots, recurrent pregnancy loss, and autoimmune diseases such as Systemic Lupus Erythematosus (SLE). It is commonly performed along with Anti-Cardiolipin IgG, Anti-β2 Glycoprotein I antibodies, and Lupus Anticoagulant testing for a comprehensive APS evaluation.

Benefits of the Test

  • Helps diagnose Antiphospholipid Syndrome (APS).
  • Detects Anti-Cardiolipin IgM antibodies accurately.
  • Assists in evaluating unexplained blood clots.
  • Supports investigation of recurrent miscarriages.
  • Helps assess autoimmune disorders associated with APS.
  • Guides treatment planning and long-term monitoring.

Why Doctors Recommend This Test

Doctors may recommend the Anti-Cardiolipin IgM Test for individuals with symptoms or medical conditions suggestive of Antiphospholipid Syndrome, including:

  • Deep vein thrombosis (DVT)
  • Stroke or transient ischemic attack (TIA) at a young age
  • Pulmonary embolism
  • Recurrent miscarriages
  • Stillbirth or pregnancy complications
  • Unexplained blood clotting disorders
  • Positive lupus or autoimmune disease evaluation
  • Low platelet count (thrombocytopenia)

The test is often ordered together with Anti-Cardiolipin IgG, Anti-β2 Glycoprotein I Antibodies, Lupus Anticoagulant, ANA Profile, and other autoimmune investigations.

Preparation Before Test

  • No fasting is required.
  • Continue routine medications unless advised otherwise by your physician.
  • Inform your healthcare provider about blood thinners, autoimmune conditions, and recent illnesses.
  • A blood sample is collected for laboratory analysis.

Normal Reporting Time

Reporting Time: Usually 2–5 working days, depending on laboratory processing protocols.

Who Should Take This Test?

This test is recommended for:

  • Individuals with unexplained blood clots.
  • Women with recurrent miscarriages or pregnancy complications.
  • Patients with suspected Antiphospholipid Syndrome (APS).
  • Individuals with Systemic Lupus Erythematosus (SLE).
  • Patients with unexplained thrombosis or low platelet counts.
  • Individuals referred by rheumatologists, hematologists, or obstetricians.

Patient-Friendly Summary

The Anti-Cardiolipin Antibody (IgM) Test is a blood test that detects antibodies associated with Antiphospholipid Syndrome (APS), an autoimmune disorder that causes the immune system to mistakenly attack certain proteins involved in normal blood clotting. This condition increases the risk of abnormal blood clots, stroke, deep vein thrombosis (DVT), and recurrent pregnancy loss. The test is often performed in individuals with unexplained clotting disorders or repeated miscarriages and is commonly combined with other antiphospholipid antibody tests for a complete evaluation. The test is safe, requires only a blood sample, and does not require fasting.

Test FAQs

What is the Anti-Cardiolipin IgM Test?

It is a blood test that detects IgM antibodies against cardiolipin to help diagnose Antiphospholipid Syndrome (APS).

Why is this test performed?

It helps investigate unexplained blood clots, recurrent miscarriages, and autoimmune clotting disorders.

Is fasting required before the test?

No. Fasting is generally not required.

What sample is required?

A blood sample is collected for laboratory analysis.

What conditions can this test help diagnose?

It helps diagnose Antiphospholipid Syndrome (APS) and supports the evaluation of autoimmune clotting disorders.

Is this test performed with other antiphospholipid antibody tests?

Yes. It is commonly ordered with Anti-Cardiolipin IgG, Anti-β2 Glycoprotein I antibodies, and Lupus Anticoagulant testing.

Can this test help investigate recurrent pregnancy loss?

Yes. It is one of the important laboratory tests used to evaluate recurrent miscarriages related to APS.

How long does it take to receive results?

Results are usually available within 2–5 working days.

Is the Anti-Cardiolipin IgM Test safe?

Yes. It is a routine and safe blood test.

What should I do if my result is positive?

Consult your physician or a rheumatologist/hematologist for further evaluation, repeat testing if necessary, and appropriate treatment planning.

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