Which of the following findings would indicate a client is experiencing an adverse effect from enoxaparin?

Thrombocytopenia, or a low platelet count, is a significant indication of an adverse effect associated with enoxaparin, which is a low molecular weight heparin used primarily for anticoagulation. Enoxaparin can sometimes cause heparin-induced thrombocytopenia (HIT), a serious condition that leads to a reduction in platelet counts. Monitoring for thrombocytopenia is crucial, as it can increase the risk of bleeding complications, which can be life-threatening.

Other findings such as leukocytosis, polycythemia, and neutropenia are not directly associated with adverse effects of enoxaparin. Leukocytosis refers to an increased white blood cell count, and while it can indicate infection or inflammation, it does not relate to the action or side effects of enoxaparin. Polycythemia is characterized by an increased number of red blood cells and doesn't correlate with anticoagulant therapy. Neutropenia indicates a decreased number of neutrophils and also does not have a direct connection to enoxaparin usage. Thus, recognizing thrombocytopenia is vital for managing patients who are receiving enoxaparin effectively.