The recommended children's dosage of Keflex is 25 to 50 mg/kg/day in divided doses. The maximum daily safe dosage for a child weighing 42 lb is: Round to the nearest tenth.

(Number Only, do not enter mg, kg, or day with your answer)

The correct answer is choice D. Birth history.

Choice A rationale:

The heading "Chief complaint" is used to document the primary reason for the patient seeking medical attention, such as their main symptom or concern. This is usually stated in the patient's own words and provides context for the visit, but it does not encompass information about the circumstances of birth or prematurity.

Choice B rationale:

"Review of systems" involves a systematic approach to inquire about the patient's current symptoms or physical complaints across different body systems. It helps to identify any additional issues the patient might not have mentioned initially, but it does not pertain to birth history or prematurity.

Choice C rationale:

"Present illness" is the section where the nurse documents the patient's current health concern, including the details of the symptoms, their onset, duration, and any associated factors. However, it does not encompass information about the circumstances of birth or prematurity.

Choice D rationale:

"Birth history" is the most appropriate heading for recording information about the infant's delivery, including any difficulties during delivery and the fact that the baby was born prematurely. This information is relevant for understanding the infant's medical background and potential risk factors associated with prematurity.

The correct answer is choice D. "Currant jelly" stools.

Choice A rationale:

Loose, foul-smelling stools are not characteristic of intussusception. Intussusception is a condition in which a part of the intestine invaginates into another part, causing obstruction. This obstruction often leads to "currant jelly" stools, which are composed of mucus, blood, and sloughed intestinal tissue. Loose stools might be associated with other gastrointestinal issues but are not a hallmark of intussusception.

Choice B rationale:

Ribbon-like stools are characteristic of intussusception. When a section of the intestine telescopes into another section, it can cause the stool to be squeezed into a ribbon-like shape as it passes through the narrowed portion. This description aligns with the pathophysiology of intussusception.

Choice C rationale:

Hard stools positive for guaiac indicate the presence of blood in the stool, but this finding is not specific to intussusception. Guaiac testing detects occult blood, which could be present in various gastrointestinal conditions, including bleeding ulcers or diverticulitis, and not exclusively in intussusception.

Choice D rationale:

"Currant jelly" stools are characteristic of intussusception. As mentioned earlier, these stools are the result of the obstruction and subsequent damage to the intestinal lining, leading to the presence of blood, mucus, and sloughed tissue. This description is a classic sign of intussusception and should raise suspicion for this condition.