Alvarado Score for Acute Appendicitis: Scores likelihood of appendicitis based on symptoms, signs, and lab data.

Signs
Right Lower Quadrant Tenderness?	Yes +2
Rebound Tenderness?	Yes +1
Elevated Temperature (37.3 °C or 99.1 °F)?	Yes +1
Symptoms
Migration of Pain to the Right Lower Quadrant?	Yes +1
Anorexia?	Yes +1
Nausea or Vomiting?	Yes +1
Laboratory Values
Leukocytosis > 10,000?	Yes +2
Leukocyte Left Shift?	Yes +1
Patient has none of these

A score of 5 or 6 is compatible with the diagnosis of acute appendicitis. A score of 7 or 8 indicates a probable appendicitis, and a score of 9 or 10 indicates a very probable acute appendicitis.

A popular mnemonic used to remember the Alvarado score factors is MANTRELS - Migration to the right iliac fossa, Anorexia, Nausea/Vomiting, Tenderness in the right iliac fossa, Rebound pain,Elevated temperature (fever), Leukocytosis, and Shift of leukocytes to the left (factors listed in the same order as presented above). Due to the popularity of this mnemonic, the Alvarado score is sometimes referred to as the MANTRELS score.