Correct Answer: A

Rationale: The client's symptoms of nausea, flank pain, and muscle cramps are suggestive of tumor lysis syndrome (TLS), a potentially life-threatening complication of chemotherapy in which cancer cells break down rapidly, releasing large amounts of intracellular components into the bloodstream. This leads to imbalances in electrolytes (elevated potassium, phosphate, and uric acid levels, with low calcium levels), which can cause severe metabolic disturbances, including kidney damage, arrhythmias, and muscle cramps. Checking serum electrolytes and uric acid levels is crucial for diagnosing and managing TLS early, preventing further complications.

Correct Answer: B

Rationale: A platelet count of 9800/mm³ indicates severe thrombocytopenia, placing the client at high risk for bleeding, even with minor trauma or injury. Instructing the client to call for help before getting out of bed ensures they receive assistance with mobility, which reduces the risk of falls or injuries that could lead to serious bleeding. Preventing any activity that could result in trauma is crucial when managing clients with very low platelet counts.

Correct Answer: A

Rationale: The passage of flatus (gas) from the colostomy is an early sign that the bowel is beginning to function after surgery. This indicates that peristalsis, or the movement of the intestines, has resumed and that the digestive system is actively moving gas and eventually stool through the bowel and out of the colostomy. It's a positive sign that the bowel is recovering from the surgery and starting to work as intended.

Correct Answer: B

Rationale: An elevated white blood cell (WBC) count, also known as leukocytosis, is most commonly a response to infection. When the body detects an infection, the immune system responds by increasing the production of white blood cells to fight off the invading pathogens. The accompanying symptoms of fever and malaise are typical signs of infection, supporting the likelihood that this patient's health status is related to an infectious process rather than a more serious hematologic condition like lymphoma or leukemia.

Correct Answer: B

Rationale: Erythropoietin therapy is used to stimulate the production of red blood cells in patients with myelodysplastic syndrome (MDS), a disorder characterized by ineffective blood cell production, including red blood cells. The primary goal of erythropoietin therapy is to increase red blood cell count, improving the patient's oxygen-carrying capacity and reducing symptoms of anemia, such as fatigue and weakness. Monitoring hemoglobin levels is the best way to evaluate the effectiveness of this therapy because it directly reflects the patient's red blood cell count and the success of erythropoiesis (red blood cell production).