What is this test?
Anticardiolipin antibodies are a type of antiphospholipid antibody associated in some people with an increased risk of thrombosis or certain pregnancy complications.
Why might it be ordered?
- For an unexplained venous or arterial thrombosis.
- In certain recurrent pregnancy complications or suspected antiphospholipid syndrome.
What sample is needed?
A healthcare professional collects a venous blood sample. Depending on the method, the laboratory uses serum or plasma.
How should you prepare?
Tell the laboratory about all medicines, hormone treatments, vitamins and supplements you take. Do not stop or change treatment unless your clinician tells you to. Follow any instructions about fasting and the time of collection.
How should you understand the result?
The meaning depends on the antibody class and level, the clinical history and whether the result remains positive on repeat testing. A positive result means the tested antibodies were detected, but it does not establish a diagnosis on its own. A negative result does not rule out every autoimmune condition.
Sources and editorial status
This patient-facing text is an editorial draft. It should be approved by a laboratory physician before official publication.