Score to assist in diagnosing acute appendicitis.
Sensitivity 98%, specificity 81%, PPV 85%, NPV 97%
Score: < 5 = unlikely appendicitis, 5-7 = low prob. appendicitis, 7-11 = high prob. appendicitis
Many experts feel 3% is an acceptable miss rate for appendicitis.
Chong CF et al. Comparison of RIPASA and Alvarado scores for the diagnosis of acute appendicitis. Singapore Med J. 2011; 52(5):340-345.
Chong CF, Adi MI, Thien A, et al. Development of the RIPASA score: a new appendicitis scoring system for the diagnosis of acute appendicitis. Singapore Med J. 2010; 51:220–225.