Can a simple blood test tell two forms of a clotting disorder apart?

This study looks at three blood markers — mean platelet volume (MPV), platelet-to-lymphocyte ratio (PLR), and neutrophil-to-lymphocyte ratio (NLR) — in people with antiphospholipid syndrome (APS), an autoimmune condition that raises the risk of blood clots and pregnancy complications. Researchers want to see whether these markers differ between primary APS (occurring alone) and secondary APS (occurring with another autoimmune disease like lupus). The goal is to find a simple, inexpensive way to help tell the two forms apart.