Phosphotidyl serine IgM antibody - Serum

Phosphatidylserine IgM Antibody – Serum Test

The Phosphatidylserine IgM Antibody – Serum Test is a laboratory blood test that detects Immunoglobulin M (IgM) autoantibodies directed against phosphatidylserine, a phospholipid found in cell membranes. These antibodies are part of the broader group of antiphospholipid antibodies (aPL) and may be detected in patients with antiphospholipid syndrome (APS) or other autoimmune conditions.

Antiphospholipid syndrome is an autoimmune disorder characterized by an increased tendency to develop arterial or venous blood clots and pregnancy-related complications. It may occur as a primary condition or in association with autoimmune diseases such as systemic lupus erythematosus (SLE).

Clinical manifestations of APS may include:

• Deep vein thrombosis (DVT)
• Pulmonary embolism
• Stroke or transient ischemic attack (TIA)
• Recurrent miscarriages
• Stillbirth
• Pre-eclampsia
• Placental insufficiency
• Low platelet count (thrombocytopenia)

The Phosphatidylserine IgM Antibody Test is usually performed as an adjunctive investigation when patients have symptoms suggestive of APS but standard antiphospholipid antibody tests are negative or inconclusive, or when clinicians require an extended autoimmune evaluation.

A positive Phosphatidylserine IgM result indicates the presence of antibodies against phosphatidylserine. However, a positive result alone does not confirm antiphospholipid syndrome, as these antibodies may also occur temporarily following infections or inflammatory illnesses.

The internationally accepted laboratory criteria for APS currently include:

• Lupus Anticoagulant (LA)
• Anticardiolipin (aCL) IgG and IgM
• Anti-β2 Glycoprotein I (anti-β2GPI) IgG and IgM

Phosphatidylserine IgM antibodies are classified as non-criteria antiphospholipid antibodies. They may provide additional clinical information in selected patients but are not included in the revised Sydney classification criteria used for formal APS diagnosis.

Benefits of the Test

• Detects Phosphatidylserine IgM autoantibodies.
• Supports evaluation of suspected antiphospholipid syndrome.
• Assists in investigating unexplained thrombosis.
• Helps evaluate recurrent pregnancy loss.
• Complements standard APS laboratory testing.
• Requires only a simple blood sample.
• Supports autoimmune disease assessment.
• Assists rheumatologists and hematologists in clinical evaluation.

Why Doctors Recommend This Test

Doctors may recommend the Phosphatidylserine IgM Antibody Test for patients with:

• Recurrent unexplained blood clots.
• Recurrent pregnancy loss.
• Suspected antiphospholipid syndrome.
• Systemic lupus erythematosus.
• Autoimmune diseases associated with thrombosis.
• Unexplained thrombotic events.

Preparation Before the Test

No special preparation is required.

You may eat and drink normally unless instructed otherwise. Inform your healthcare provider about previous blood clots, pregnancy history, autoimmune disorders, anticoagulant medications, recent infections, or inflammatory conditions. A blood sample is collected from a vein for laboratory analysis.

Normal Reporting Time

Typically: 3–7 Working Days

Reporting time may vary depending on the laboratory methodology.

Who Should Take This Test?

This test may be recommended for:

• Patients with suspected antiphospholipid syndrome.
• Individuals with unexplained venous or arterial thrombosis.
• Women with recurrent miscarriages.
• Patients with systemic lupus erythematosus.
• Individuals with early-onset stroke.
• Patients with thrombocytopenia.
• Individuals undergoing autoimmune disease evaluation.
• Patients with suspected non-criteria APS.
• Individuals referred by rheumatologists or hematologists.
• Anyone advised by their healthcare provider.