A nurse is assessing a preoperative client. The client has a history of atrial fibrillation and is taking warfarin daily. Which test order will the nurse request from the provider?

A. Metolazone is a thiazide-like diuretic that works primarily in the distal convoluted tubule of the nephron. It can lead to hyponatremia due to its mechanism of increasing sodium and water excretion. However, it is not typically associated with hyperkalemia.
B. Furosemide is a loop diuretic that acts on the ascending loop of Henle. It primarily causes loss of sodium, potassium, and chloride ions. While it can lead to hypokalemia (low potassium levels) due to increased potassium excretion, it does not typically cause hyperkalemia or hyponatremia.
C. Hydrochlorothiazide is a thiazide diuretic that acts on the distal convoluted tubule. It can cause hyponatremia due to increased sodium and water excretion. It may also lead to hypokalemia but is not typically associated with hyperkalemia.
D. Spironolactone is a potassium-sparing diuretic that works by antagonizing aldosterone receptors in the distal nephron, leading to retention of potassium and excretion of sodium. It can cause hyperkalemia due to its potassium-sparing effects. Additionally, it may also lead to hyponatremia, although less commonly than thiazide diuretics.

A. Assessment is the first phase of the nursing process where the nurse collects data about the client's health status, including medical history, current symptoms, and potential allergies. During the assessment phase, the nurse should specifically ask the client about any known allergies to medications, foods, or other substances. This information is crucial for ensuring patient safety during diagnostic testing and any subsequent treatments.
B. The planning phase involves developing a care plan based on the assessment data gathered. While the nurse does consider potential allergies during this phase when planning interventions and care strategies, the primary focus is on creating a plan that addresses the client's specific needs and goals.
C. Implementation is the phase where the nurse carries out the interventions outlined in the care plan. If the client has allergies identified during the assessment phase, the nurse must ensure that these allergies are communicated to the healthcare team and that appropriate precautions are taken during diagnostic testing and any procedures or treatments.

D. Evaluation is the final phase of the nursing process where the nurse assesses the client's response to interventions and determines the effectiveness of the care plan. Although allergies are primarily addressed in the assessment phase, the nurse continues to monitor for allergic reactions throughout the client's care and promptly addresses any concerns that arise.