Advanced Search
Discover new calcs: choose 1 function + 1 more filter
Click here to discover
Pulmonary Embolism
calculators for
After you diagnose a PE, discover
Pulmonary Embolism
calculators for

    Calc Function

  • Calcs that help predict probability of a diseaseDiagnosis
  • Subcategory of 'Diagnosis' designed to be very sensitiveRule Out
  • Disease is diagnosed: prognosticate to guide treatmentPrognosis
  • Numerical inputs and outputsFormula
  • Med treatment and moreTreatment
  • Suggested protocolsAlgorithm





Chief Complaint


Organ System


Pediatric Appendicitis Score (PAS)

Predicts appendicitis in children.

Use for patients 3-18 years of age.

About the Creator
Dr. Madan Samuel
Content Contributors
  • Jamie Lovell, MD


For patients who are not low risk, next steps include NPO status, IV fluids, analgesia, and imaging or surgical consultation.


Low Risk PAS (<4)

  • Low likelihood of acute appendicitis, and likely do not warrant imaging.
  • The score has a higher negative predictive value (95%) in the absence of RLQ pain, pain with walking/jumping or coughing, and an ANC <6,750.
  • Consider other causes of acute abdominal pain.

Equivocal PAS (4-6)

  • Imaging can be helpful for this subgroup of patients, preferably ultrasound or MRI for pediatric patients.
  • Surgical consults are warranted for patients with equivocal scores and imaging where the appendix cannot be visualized.

High Risk PAS (>6)

  • Surgical consult is warranted for these patients.
  • Imaging may still be pursued, but patients should only undergo ultrasound prior to a surgical consult.

Critical Actions

Patients in the low risk group according to the PAS do not have a zero risk. Use clinical discretion if imaging or surgical consult may aid in diagnosis.

Content Contributors
  • Jamie Lovell, MD