Anti-cardiolipin IgM is a blood test that detects IgM antibodies against cardiolipin, a type of phospholipid. It’s mainly used to help diagnose Antiphospholipid syndrome (APS).
🔬 What It Means
IgM = early-type antibody.
These antibodies can increase the risk of blood clots.
They may also be associated with certain autoimmune conditions like Systemic lupus erythematosus.
🧪 Why Doctors Order This Test
Unexplained blood clots
Recurrent pregnancy complications (in older patients)
Evaluation for suspected antiphospholipid syndrome
Sometimes as part of an autoimmune workup
📊 Interpretation (General Guide)
| Result | Meaning |
|---|---|
| Negative | Normal – no significant antibody detected |
| Low Positive | May be temporary (can occur with infections) |
| Moderate/High Positive | May suggest antiphospholipid syndrome (if persistent) |
Important: To diagnose APS, the antibody must usually be positive on two tests at least 12 weeks apart.
📝 Key Points
IgM can sometimes be temporary (e.g., after infections).
Persistent moderate/high levels are more clinically significant.
Results must be interpreted with symptoms and other tests.
If you’d like, share your exact value and reference range, and I can help explain what it may indicate.
