A nurse is caring for a client who is receiving an IV infusion of heparin. Which of the following findings should indicate to the nurse the client is at risk for hemorrhage? (Select all that apply.)

Choice A rationale Thrombocytopenia, defined as a platelet count below 150,000 cells/mm$^3$, increases a client's risk for hemorrhage. Platelets are crucial for primary hemostasis by forming a plug at the site of vascular injury. When the platelet count is low, this initial clotting process is impaired, leading to prolonged bleeding and an increased propensity for both internal and external hemorrhage, particularly in clients receiving anticoagulant therapy like heparin. Choice B rationale Neutropenia, characterized by a low neutrophil count (less than 1,500 cells/mm$^3$), increases a client's susceptibility to infections. Neutrophils are a type of white blood cell that plays a primary role in the innate immune response by phagocytizing pathogens. While neutropenia is a significant finding in many clinical scenarios, it does not directly affect the coagulation cascade or platelet function, and therefore, does not increase the risk of hemorrhage. Choice C rationale Hypokalemia is an electrolyte imbalance where the potassium level in the blood is low, typically below 3.5 mEq/L. Potassium is essential for nerve and muscle cell function, particularly for cardiac electrical activity. While severe hypokalemia can lead to cardiac arrhythmias and muscle weakness, it does not have a direct physiological effect on the clotting factors or platelet function that would predispose a client to hemorrhage. Choice D rationale Hyperglycemia, a condition of elevated blood glucose levels (greater than 110 mg/dL fasting), is characteristic of diabetes mellitus. While chronic hyperglycemia can lead to microvascular and macrovascular complications, it does not acutely or directly impact the clotting cascade or platelet count. In fact, hyperglycemia can sometimes lead to hypercoagulability, which is the opposite of the hemorrhagic risk associated with heparin. Choice E rationale A fever is a temporary increase in body temperature, typically above 38°C (100.4°F). It is a common symptom of infection or inflammation. While a fever can be a sign of an underlying medical condition, it is not a direct indicator of an increased risk for hemorrhage. Fever does not alter the function of platelets or the production of clotting factors, making it an unrelated finding in this context. Choice F rationale Dark stools, also known as melena, are a key indicator of upper gastrointestinal bleeding. The dark color is caused by the presence of digested blood, specifically hemoglobin that has been chemically altered by digestive enzymes and bacteria in the small and large intestines. This finding directly signals an active bleeding event, confirming the client is experiencing a form of hemorrhage.