Why a score for appendicitis?
Appendicitis is the most common cause of emergency abdominal surgery, but its early signs overlap with many other conditions: gastroenteritis, ovarian cysts, urinary infections and constipation. The Alvarado score, published in 1986, combines symptoms, examination findings and a simple blood count into a 10-point scale that helps decide who can go home, who needs imaging and who probably needs a surgeon.
The criteria (MANTRELS)
| Finding | Points |
|---|---|
| Migration of pain to the right lower quadrant | 1 |
| Anorexia (loss of appetite) | 1 |
| Nausea or vomiting | 1 |
| Tenderness in the right lower quadrant | 2 |
| Rebound tenderness | 1 |
| Elevated temperature, 37.3 °C (99.1 °F) or more | 1 |
| Leukocytosis, white cells above 10,000/µL | 2 |
| Shift to the left, neutrophils above 75% | 1 |
Interpretation
| Score | Likelihood of appendicitis | Usual approach |
|---|---|---|
| 1–4 | Unlikely | Consider other causes; discharge with clear return advice is often possible |
| 5–6 | Possible | Observation, repeat examination, imaging |
| 7–8 | Probable | Surgical consultation, imaging to confirm |
| 9–10 | Very probable | Surgical consultation |
Worked example
A 22-year-old reports pain that started around the navel and moved to the right lower abdomen (1), with nausea (1). The examination finds right lower quadrant tenderness (2) and the white count is 13,000/µL (2). There is no rebound, fever or left shift.
Score = 1 + 1 + 2 + 2 = 6: appendicitis is possible, and imaging, usually ultrasound first and then CT if needed, is the next step.
Strengths and limits
- The score is most reliable at ruling out appendicitis: a score below 5 makes it unlikely in most studies.
- It overestimates the risk in women of childbearing age, in whom gynecologic causes are common.
- It works less well in children and older adults. The Pediatric Appendicitis Score is often preferred for children, and the newer AIR score adds C-reactive protein.
- It does not replace clinical judgment or imaging; a high score is not an indication for surgery by itself.
When to seek care
Abdominal pain that gets steadily worse, moves to the right lower side, comes with fever or vomiting, or makes walking or coughing painful needs prompt medical evaluation.
This calculator is for general information and education. It is not medical advice and does not replace the judgment of a doctor, nurse or pharmacist who knows the full clinical picture.