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Hi Karol,

This test isn't related to lupus, but to APS.
It is the standard test used to measure the "lupus anticoagulant" .There are a few other methdod,but this is the most common one to my knowledge.
Basically it is a clotting study.They add snake venom from the russell viper to blood in a vial. Normally it clots in a jiffy but in people with the lupus anticoagulant it doesn't,thus the number of an abnormal result is high (longer clotting time).This is confusing, because in the body the opposite happens - the blood clots too easily.

I've oversimplified this rather so feel free to get more technical, but essentially this is it.

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