Assessing appendicitis begins with a clinician taking a structured history and performing a focused physical examination. The goal is to determine whether the presentation is typical or atypical, which guides the next steps in diagnostic workup and surgical consultation. Because appendicitis can mimic other conditions and complications range from perforation to sepsis, a systematic approach is essential for patient safety.
Key Clinical Features and History
When assessing appendicitis, the history should emphasize the onset, location, and progression of abdominal pain. Classic teaching describes periumbilical pain that migrates to the right lower quadrant, often accompanied by anorexia, nausea, or low-grade fever. Ask about associated symptoms such as vomiting, changes in bowel habits, or urinary symptoms to help differentiate appendicitis from gynecologic, gastrointestinal, or urologic pathology.
Physical Examination Maneuvers
Physical examination for appendicitis relies on targeted maneuvers that reproduce localized tenderness and signs of peritoneal irritation. Inspection may reveal localized guarding or abdominal wall rigidity, while palpation focuses on the right lower quadrant. Systematic palpation, starting away from the area of pain and moving toward the suspected site, reduces reflex guarding and improves assessment of true tenderness.
Specific Signs to Test
McBurney point tenderness: located one-third of the distance from the anterior superior iliac spine to the umbilicus.
Rovsing sign: palpation of the left lower quadrant that elicits pain in the right lower quadrant.
Psoas sign: pain on passive extension of the right hip, suggesting retrocecal appendicitis.
Obturator sign: pain with internal rotation of the flexed right hip, indicating pelvic appendiceal inflammation.
Laboratory and Imaging Assessment
Laboratory findings support but do not confirm the diagnosis. Leukocytosis with a left shift and elevated C-reactive protein are common in appendicitis, yet normal values do not exclude the condition. Urinalysis helps rule out urinary tract infection or nephrolithiasis, while a pregnancy test is mandatory in individuals of reproductive age to avoid fetal radiation exposure from imaging.
Role of Imaging
Computed tomography with contrast is the preferred imaging modality for adults, offering high sensitivity and specificity to identify appendiceal enlargement, fat stranding, or abscess formation. In pregnant patients, ultrasound is the initial imaging choice to minimize fetal radiation, followed by MRI if the diagnosis remains unclear. Avoid routine use of plain abdominal radiographs, as they have limited diagnostic value for appendicitis.
Clinical Prediction Rules
Using clinical prediction rules can refine the probability of appendicitis and support decisions about imaging. The Alvarado score incorporates symptoms, physical findings, and laboratory results to stratify risk, while the Pediatric Appendicitis Score applies similar principles in children. These tools assist clinicians in balancing the risks of unnecessary surgery against the dangers of delayed diagnosis.
Special Considerations and Atypical Presentations
Assessment must adapt for special populations, including older adults, pregnant individuals, and children, who may present with subtle or exaggerated signs. Atypical presentations, such as retrocecal or pelvic appendicitis, can manifest with back pain, urinary symptoms, or isolated fever. Maintaining a high index of suspicion in these groups is crucial to prevent perforation and adverse outcomes.
