When palpating the child's cervical lymph nodes, the nurse notes that they are tender, enlarged, and warm.
The best explanation for this is.

Choice A rationale:
Bronchoscopy is not the essential test for diagnosing cystic fibrosis. Bronchoscopy is a procedure that allows the healthcare provider to visualize the airways and lungs but is not the primary test for cystic fibrosis diagnosis. Cystic fibrosis is primarily diagnosed through genetic testing and sweat chloride testing.
Choice B rationale:
Serum calcium levels are not specific to cystic fibrosis diagnosis. Serum calcium levels are typically used to assess calcium balance in the body and are not directly related to cystic fibrosis diagnosis.
Choice C rationale:
Urine creatinine levels are not specific to cystic fibrosis diagnosis. Urine creatinine levels are often used to assess kidney function and muscle breakdown but are not diagnostic for cystic fibrosis.
Choice D rationale:
Sweat chloride test is essential in establishing the diagnosis of cystic fibrosis. Cystic fibrosis is characterized by the abnormal transport of chloride across cell membranes, leading to salty sweat. The sweat chloride test measures the amount of chloride in the sweat and is a key diagnostic test for cystic fibrosis. Values above a certain threshold (typically 60 mmol/L) are suggestive of cystic fibrosis.

Choice A rationale:
A review of systems is essential in a health history because it helps in understanding the patient's overall health status and can reveal symptoms or issues that the patient might not consider significant. This information aids in making a comprehensive assessment.
Choice D rationale:
Height, weight, and BMI data are crucial parameters to assess a patient's nutritional status and overall health. These measurements help in identifying obesity, malnutrition, or other health-related issues.
Choice E rationale:
Diet and nutritional intake provide insights into the patient's eating habits, dietary restrictions, allergies, and potential deficiencies. This information is vital for assessing the patient's overall health and planning appropriate interventions.
Choice F rationale:
Family medical history is valuable as it helps in identifying genetic predispositions, hereditary diseases, and other health conditions that might run in the family. This information is crucial for understanding the patient's risk factors and developing a personalized healthcare plan. Choice B and C rationales: Physical assessment is indeed essential in healthcare, but it is not a part of the health history, which specifically focuses on the patient's past and current health status, medical conditions, medications, allergies, surgeries, and lifestyle habits. Similarly, a sexual history is important, especially for specific medical conditions, but it might not be relevant to every patient and might not always be included in the general health history.