Correct Answer: B

Rationale: The correct answer is B. A serum potassium level of 6.5 mEq/L is dangerously high and should be reported before hemodialysis to prevent cardiac complications. High potassium levels can lead to life-threatening arrhythmias. Serum creatinine (Choice A) is elevated in renal dysfunction but not the most critical value to report before hemodialysis. Serum calcium (Choice C) and serum bicarbonate (Choice D) levels are within normal limits and are not immediate concerns before hemodialysis.

Correct Answer: D

Rationale: The correct answer is to notify the healthcare provider immediately (Option D). Blurred vision in a client on long-term steroid therapy can be a sign of serious conditions like cataracts or glaucoma, which need urgent medical evaluation and management. Instructing the client to use artificial tears (Option A) may help with dry eyes but does not address the underlying cause of blurred vision. Administering an ophthalmic antibiotic (Option B) is not indicated unless there is a specific infection present. Referring the client to an optometrist for an eye exam (Option C) may delay necessary medical intervention by the healthcare provider, who should be involved promptly in this situation.

Correct Answer: C

Rationale: A serum creatinine level of 2.5 mg/dl is the most concerning laboratory value in a client with chronic kidney disease scheduled for a renal biopsy. An elevated serum creatinine level indicates impaired kidney function, which is critical information before performing a renal biopsy. Option A (Serum potassium of 5.5 mEq/L) may be concerning for hyperkalemia but is not directly related to the renal biopsy procedure. Option B (Serum creatinine of 1.5 mg/dl) is within normal limits, suggesting relatively normal kidney function. Option D (White blood cell count of 8,000/mm3) is within the normal range and not directly related to the renal biopsy procedure or CKD management.

Correct Answer: C

Rationale: The correct answer is C: 'Use of accessory muscles.' In a client with COPD and pneumonia, the use of accessory muscles indicates increased work of breathing. This finding is concerning as it may signal respiratory failure, requiring immediate intervention. Oxygen saturation of 90% (choice A) is low but not as immediately concerning as the increased work of breathing. A respiratory rate of 24 breaths per minute (choice B) is slightly elevated but not as critical as the use of accessory muscles. Inspiratory crackles (choice D) may be present in pneumonia but are not as indicative of impending respiratory failure as the increased work of breathing shown by the use of accessory muscles.

Correct Answer: A

Rationale: Elevating the head of the bed to 60 to 90 degrees is essential when inserting an NG tube. This position helps facilitate the passage of the tube through the esophagus into the stomach and reduces the risk of aspiration. Administering an antiemetic may be necessary to control nausea or vomiting, but it is not the primary intervention when inserting an NG tube. Preparing the client for surgery is not indicated solely for the insertion of an NG tube. Providing oral care is important for maintaining oral hygiene but is not directly related to inserting an NG tube.