Please write a SOAP note for a patient presenting with acute periumbilical abdominal pain radiating to the right lower quadrant, onset 4 hours ago, rated 7/10, associated nausea, stable vital signs, mild RLQ tenderness with guarding, white blood cell count of 12,000 cells/µL, and normal serum lipase.

SOAP Note: Acute Periumbilical Abdominal Pain Migrating to Right Lower Quadrant

Subjective

Chief Complaint: Acute periumbilical abdominal pain radiating to right lower quadrant

History of Present Illness:

• Onset: 4 hours ago
• Location: Started periumbilical, now localized to right lower quadrant (RLQ)
• Quality/Severity: 7/10 intensity
• Associated symptoms: Nausea present
• Pertinent negatives to document: Anorexia status, vomiting, fever, difficulty walking, focal RLQ pain history

This presentation represents the "classic" appendicitis pattern, occurring in approximately 50% of appendicitis cases 1.

---

Objective

Vital Signs: Stable (document specific values: temperature, heart rate, blood pressure, respiratory rate)

Physical Examination:

• Abdomen: Mild RLQ tenderness with guarding present
• Critical findings to document:
  • Rebound tenderness (present/absent)
  • McBurney's point tenderness
  • Rovsing's sign
  • Psoas sign
  • Obturator sign
  • Ability to walk/gait disturbance

Laboratory Results:

• WBC: 12,000 cells/µL (elevated)
• Document: Absolute neutrophil count (ANC >6,750/mm³ significantly associated with appendicitis) 2
• Serum lipase: Normal (effectively excludes acute pancreatitis, as lipase >3× upper limit normal has 100% sensitivity for pancreatitis) 3

---

Assessment

Primary Diagnosis: Acute appendicitis (suspected)

Clinical Scoring: Calculate Alvarado Score to stratify risk 2:

• Migration of pain to RLQ: 1 point
• Anorexia: 1 point
• Nausea/vomiting: 1 point
• RLQ tenderness: 2 points
• Rebound tenderness: 1 point
• Elevated temperature: 1 point
• Leukocytosis (WBC >10,000): 2 points
• Left shift: 1 point

Risk Stratification:

• Score 7-10: High probability (78% have appendicitis) - surgical consultation before imaging
• Score 4-6: Intermediate probability (36% have appendicitis) - proceed with CT imaging
• Score 0-3: Low probability (5% have appendicitis) - consider alternative diagnoses

Based on this patient's presentation with classic migration pattern, nausea, RLQ tenderness with guarding, and leukocytosis, the Alvarado score is likely ≥6, warranting immediate imaging.

Differential Diagnoses to Consider:

• Acute appendicitis (primary concern)
• Ileocecal pathology
• Mesenteric adenitis
• Ovarian pathology (if female)
• Diverticulitis
• Intestinal malrotation with appendicitis (rare but reported) 4

---

Plan

Immediate Management:

1. Imaging - CT Abdomen and Pelvis (PRIORITY)

CT is the definitive diagnostic modality with sensitivity 85.7-100% and specificity 94.8-100%, reducing negative appendectomy rate from 16.7% to 8.7% 1.

Contrast protocol options 2:

• IV contrast with or without enteral contrast (preferred for speed and diagnostic accuracy)
• Sensitivity 90-100%, specificity 94.8-100% even without enteral contrast 1
• Non-contrast CT acceptable if contrast contraindicated (sensitivity 90%, specificity 94%) 1

Rationale: The 2022 ACR Appropriateness Criteria specifically recommend CT for RLQ pain with suspected appendicitis as the most useful diagnostic modality 1. Ultrasound has significantly lower sensitivity (51.8-81.7%) with 27-45% non-visualization rate 1.

2. Surgical Consultation

• Immediate consultation if Alvarado score ≥7 (can be done before or concurrent with CT)
• Post-imaging consultation if score 4-6 and CT confirms appendicitis

3. Supportive Care:

• NPO status
• IV fluid resuscitation
• Analgesia (does NOT mask peritoneal signs or delay diagnosis)
• Antiemetics as needed

4. Antibiotics:

• Hold until diagnosis confirmed on imaging or by surgical team
• If appendicitis confirmed: broad-spectrum coverage (e.g., piperacillin-tazobactam or ceftriaxone + metronidazole)

Critical Pitfalls to Avoid:

• Do not rely on ultrasound alone - 27-45% non-visualization rate and sensitivity only 51.8-81.7% in adults 1
• Do not delay imaging for oral contrast administration - IV contrast alone is sufficient and faster 1
• Do not dismiss diagnosis with low Alvarado score alone - 8.4% of appendicitis cases have scores <5, especially in elderly 2
• Consider atypical presentations - intestinal malrotation, retrocecal appendix, or pelvic appendix can present with unusual pain patterns 4, 5

Disposition:

• Admit for surgical evaluation if CT confirms appendicitis
• Observe with repeat examination if CT negative but clinical suspicion remains high
• Discharge with precautions only if imaging negative AND clinical picture inconsistent with appendicitis

Follow-up: Return immediately if pain worsens, fever develops, vomiting occurs, or inability to tolerate oral intake.