The nurse is caring for a child who has been admitted with a possible diagnosis of cystic fibrosis. Which is the laboratory/diagnostic tool that would likely be used to help determine the diagnosis of this child?

Correct Answer: B

Rationale: The sweat chloride test (B) diagnoses cystic fibrosis by detecting high sodium/chloride levels. Blood culture (A), EEG (C), and ECG (D) are unrelated. Document: 'The analysis of sweat is a major aid in diagnosis.'

Correct Answer: A

Rationale: Appendicitis A can result from pinworms, per document p18, 7.

Correct Answer: C

Rationale: Roseola features fever followed by a rash, per AAP. A, B, D, E have concurrent fever and rash.

Correct Answer: A

Rationale: Measles features fever and Koplik spots, per CDC. B-E differ.

Correct Answer: A

Rationale: CAH fits XX karyotype and maternal virilization, per AAP (doc p148, Q561).

Correct Answer: C

Rationale: C. trachomatis is the top cause of cervicitis in adolescents, per CDC, due to sexual transmission. HSV and others (B, D, E) are less common.

Correct Answer: C

Rationale: Gestational age C is measured by the Ballard/Dubowitz tool, per document 5.

Correct Answer: A

Rationale: Axillary A is safest for infants, per document p23, 7.

Correct Answer: D

Rationale: All D assess head injury, per document p54, 1.