A nurse is caring for a 24-year-old female client who presents to the emergency department (ED) with reports of abdominal pain, nausea, and vomiting. Use the chart to indicate if the listed symptom or finding is consistent with gastroenteritis, appendicitis, or ectopic pregnancy. Each column must have at least one response selected.

Symptom Ectopic Pregnancy Gastroenteritis Appendicitis Abdominal pain ☑ ☑ Fever ☑ ☑ ☑ Vomiting ☑ ☑ Diarrhea ☑ Nausea ☑ Tachycardia ☑ ☑ Choice A reason (Ectopic Pregnancy): Ectopic pregnancy commonly presents with abdominal or pelvic pain due to implantation of the fertilized ovum outside the uterine cavity, most often in the fallopian tube. Systemic responses such as fever may occur if there is inflammation or rupture. Vomiting can result from severe pain and peritoneal irritation. Tachycardia is a critical finding and may indicate internal bleeding, hypovolemia, or early shock, even in the absence of hypotension. Although diarrhea and isolated nausea are not classic findings, the presence of fever, vomiting, and tachycardia aligns with a potentially unstable ectopic pregnancy that requires urgent evaluation. Choice B reason (Gastroenteritis): Gastroenteritis is characterized by inflammation of the gastrointestinal tract, commonly presenting with diffuse abdominal pain, nausea, vomiting, diarrhea, and fever. These symptoms result from irritation of the stomach and intestines, often due to infectious pathogens. Nausea and vomiting are hallmark features, while diarrhea is a defining symptom that helps distinguish gastroenteritis from surgical abdominal conditions. Fever reflects the body’s inflammatory response to infection. Tachycardia may occur secondary to dehydration but is not a defining feature and is therefore not emphasized in this category. Choice C reason (Appendicitis): Appendicitis classically presents with severe abdominal pain localized to the right lower quadrant, often accompanied by fever due to localized infection and inflammation of the appendix. Tachycardia may develop as a systemic response to pain, fever, or evolving infection. While nausea and vomiting can occur early in appendicitis, diarrhea is not typical and would suggest an alternative diagnosis. The constellation of right lower quadrant pain, fever, and tachycardia strongly supports appendicitis as a likely cause of this client’s symptoms. Incorrect associations rationale: Diarrhea is not consistent with appendicitis or ectopic pregnancy because these conditions do not primarily involve inflammation of the intestinal mucosa. Nausea alone without gastrointestinal tract involvement is less characteristic of appendicitis or ectopic pregnancy compared with gastroenteritis. Vomiting is less consistently associated with appendicitis than with gastroenteritis or ectopic pregnancy-related pain responses. Selecting these findings incorrectly could delay identification of the true underlying pathology and appropriate treatment.