Correct Answer: C

Rationale: The sweat chloride test is the primary diagnostic test for cystic fibrosis. Cystic fibrosis is characterized by abnormal transport of chloride and sodium across epithelial cell membranes, leading to increased chloride in sweat. This test is crucial for diagnosing cystic fibrosis in suspected cases. Liver enzymes (Choice A), serum calcium (Choice B), and urine creatinine (Choice D) are not specific tests for cystic fibrosis and would not provide the necessary information for diagnosis in this case.

Correct Answer: A

Rationale: Parents become apprehensive and worried as the time for discharge approaches, which is a common parental reaction. They often have concerns and insecurities about caring for their infant. The worry about potential dangers is a normal adaptive response reflecting the parents' concern for their child's well-being. It is essential for healthcare providers to acknowledge these feelings and support parents in gaining confidence in caring for their infant. Choices B, C, and D are incorrect because the parents' apprehension in this context is a typical emotional response and not indicative of maladaptation, a reason to postpone discharge, or inadequate bonding.

Correct Answer: D

Rationale: Physical punishment, such as spanking, may result in children misbehaving when parents are not present, as it does not teach appropriate behavior or self-regulation.

Correct Answer: B

Rationale: Azotemia (elevated BUN and creatinine) and oliguria (reduced urine output) are classic signs of renal failure, indicating impaired kidney function. In renal failure, the kidneys are unable to effectively filter waste products, leading to an increase in BUN and creatinine levels in the blood. Additionally, oliguria occurs due to decreased kidney function. Increased GFR (Choice C) is not expected in renal failure as it signifies improved kidney function, which is not the case in renal failure. Polyuria and elevated creatinine clearance (Choice D) are not typical findings in renal failure. Polyuria is more commonly associated with conditions like diabetes insipidus, while elevated creatinine clearance would indicate increased kidney function, which is contrary to the impaired function seen in renal failure.

Correct Answer: B

Rationale: The correct answer is B: Guided imagery. Guided imagery is an effective distraction technique for adolescents as it helps them focus on positive mental images instead of the pain. This technique can be a powerful tool in managing pain and anxiety during procedures. Blowing bubbles (choice A) may be more suitable for younger children as it can engage them visually and help distract them. EMLA cream (choice C) is a topical anesthetic and not a distraction technique. Sucrose solution (choice D) is used for pain relief in infants, not typically for adolescents undergoing painful procedures.