A nurse is reviewing laboratory results for a client who is taking warfarin. Which of the following laboratory tests determines if the dose of medication is within the recommended target range?

Choice A reason: Performing postural drainage immediately after meals risks aspiration and discomfort due to gastric contents shifting during positioning. It should be done 1-2 hours after meals to ensure safety and efficacy in clearing mucus from the lungs, making this timing inappropriate for cystic fibrosis management.
Choice B reason: Performing postural drainage twice daily is recommended for cystic fibrosis to mobilize thick mucus from the lungs, improving airway clearance and reducing infection risk. This frequency balances effectiveness with patient tolerance, aligning with evidence-based guidelines for managing chronic respiratory conditions, making it the correct action.
Choice C reason: Using a percussion vest is an alternative to manual postural drainage but is not specified as the only method. Manual techniques are effective and standard unless a vest is prescribed. This choice assumes equipment availability, which may not apply, making it less universally appropriate than scheduled manual drainage.
Choice D reason: Positioning the child flat during postural drainage is incorrect, as specific angled positions (e.g., head-down) are needed to target lung segments and promote mucus drainage by gravity. Flat positioning reduces effectiveness and may not clear airways adequately, making this an inappropriate technique for cystic fibrosis.

Choice A reason: Anuria, minimal or no urine output, is expected in end-stage kidney disease (ESKD) due to nephron loss, reducing glomerular filtration rate. This causes fluid and toxin buildup, requiring dialysis to manage fluid balance and prevent complications like uremia in ESKD clients.
Choice B reason: Edema results from impaired sodium and water excretion in ESKD, causing fluid overload. Reduced filtration leads to volume retention, manifesting as peripheral or pulmonary edema, increasing cardiovascular strain and necessitating diuretics or dialysis to control fluid status effectively.
Choice C reason: Hyperkalemia occurs in ESKD, as failing kidneys cannot excrete potassium, elevating serum levels. This risks cardiac arrhythmias due to disrupted membrane potentials. Dietary restrictions or dialysis are needed to manage potassium, preventing life-threatening complications in end-stage renal failure.
Choice D reason: Hypocalcemia in ESKD stems from impaired vitamin D activation and phosphate retention, binding calcium. This disrupts bone mineralization and neuromuscular function, causing tetany or fractures. Calcium supplementation and dialysis correct this imbalance, addressing renal failure’s metabolic consequences.
Choice E reason: Metabolic acidosis in ESKD results from impaired hydrogen ion excretion and bicarbonate reabsorption. This lowers blood pH, causing fatigue and bone demineralization. Dialysis or bicarbonate therapy corrects acid-base imbalances, addressing the kidneys’ failure to maintain homeostasis in end-stage disease.