Specific blood tests
To diagnose APS, the blood needs to be tested for the abnormal antiphospholipid antibodies that increase the risk of blood clots.
This requires a blood test specifically designed to look for these antibodies.
A diagnosis of APS can only be made after 2 abnormal blood test results, with at least a 12-week gap between them.
This is because harmless antiphospholipid antibodies can sometimes develop in the body for short periods of time.
Usually, this is the result of an infection or a side effect of medication, such as antibiotics.
If antiphospholipid antibodies are identified during the first blood test, another test will be needed at a later date to confirm whether the abnormal antibodies are still present.
Visit Lab Tests Online for more information about antiphospholipid antibody testing.
If blood tests confirm you have APS, your medical history will be carefully assessed to check whether you have experienced any previous symptoms that may be caused by APS.
A diagnosis of APS can usually be confirmed if you have had: