I also have the positive lupus inhibitor. It is commonly called the Lupus Anticoagulant and is one of a group that make up the Antiphosphilipid antibodies.
It is usual for a second test to be carried out some weeks after first positive test as one positive is not enough for a diagnosis, and two positives within the timescale are needed to confirm APS. If this has not been suggested to you, I would request a second test. Two positives usually lead to a diagnosis of Antiphospholipid Syndrome.