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: Obtaining initial assessments requires clinical judgment and is outside the scope of assistive personnel (AP). Registered nurses must perform assessments to identify health changes accurately. Delegating this task violates scope of practice regulations, making it illegal and unsafe for AP to perform.
Choice B reason: Changing a nonsterile dressing is within the scope of assistive personnel, as it involves routine, non-invasive care under nurse supervision. AP are trained for such tasks, which do not require clinical judgment, making this a legal and appropriate delegation choice.
Choice C reason: Interpreting laboratory results requires advanced knowledge and clinical decision-making, reserved for registered nurses or providers. Assistive personnel lack the training to analyze results, so delegating this task is illegal and risks patient safety, making it an incorrect choice.
Choice D reason: Educating clients and families involves assessing learning needs and tailoring information, which requires nursing judgment. Assistive personnel are not trained for patient education, making this task outside their scope and illegal to delegate, thus an incorrect choice.