The Alvarado score is a clinical scoring system used in the diagnosis of appendicitis. The score has 6 clinical items and 2 laboratory measurements with a total 10 points.
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
Tenderness in the right iliac fossa
Elevated temperature (fever)
Shift of leukocytes to the left
Due to the popularity of this mnemonic, the Alvarado score is sometimes referred to as the MANTRELS score.
Here is some recommended guideline.