How do you interpret elevations in antiphospholipid antibodies that are lower than Sapporo criteria?   

I would refer to the following article that provides the most up-to-date definitions (including the definitions for low-level antibodies) and risk stratification tools including APL-S and GAPSS that are developed for people with autoimmune conditions. The article also discusses the levels of evidenc...

I would seriously consider positive aPL test results in the context of other factors, such as clinical evidence for thrombosis or positive ANA.