HIT is characterized by which of the following?

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Multiple Choice

HIT is characterized by which of the following?

HIT is an immune-mediated reaction after heparin exposure in which antibodies form against the heparin–platelet factor 4 (PF4) complex. These antibodies activate platelets, causing rapid platelet consumption and a sudden drop in platelet count. At the same time, activated platelets promote thrombosis, so clotting can occur despite the low platelet numbers. This is exactly what the option describes: a sudden decrease in platelets after starting heparin due to antibodies against the heparin–PF4 complex. It’s not about an increase in platelets, no change in platelets, or vitamin K–deficiency–related bleeding.

HIT is an immune-mediated reaction after heparin exposure in which antibodies form against the heparin–platelet factor 4 (PF4) complex. These antibodies activate platelets, causing rapid platelet consumption and a sudden drop in platelet count. At the same time, activated platelets promote thrombosis, so clotting can occur despite the low platelet numbers. This is exactly what the option describes: a sudden decrease in platelets after starting heparin due to antibodies against the heparin–PF4 complex. It’s not about an increase in platelets, no change in platelets, or vitamin K–deficiency–related bleeding.

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