The RIPASA score calculator evaluates the likelihood of acute appendicitis based on multiple clinical criteria. Each criterion is assigned a numerical value depending on specific user responses input into the system. The criteria include factors such as sex, age, and various symptoms. These factors are scored as follows:

- Sex: Female = 0.5, Male = 1
- Age: Less than 40 = 1, 40 or more = 0.5
- Foreign national: Yes = 1, No = 0
- Right iliac fossa pain: Yes = 0.5, No = 0
- Pain migration to the right iliac fossa: Yes = 0.5, No = 0
- Anorexia: Yes = 1, No = 0
- Nausea and vomiting: Yes = 1, No = 0
- Duration of symptoms: 48 hours or less = 1, more than 48 hours = 0.5
- RIF tenderness: Yes = 1, No = 0
- Right iliac fossa guarding: Yes = 2, No = 0
- Rebound tenderness: Yes = 1, No = 0
- Rovsing's sign: Yes = 2, No = 0
- Fever: Yes = 1, No = 0
- Elevated white blood cell count: Yes = 1, No = 0
- Negative urine analysis: Yes = 1, No = 0

The calculator collects these responses, converts them into their respective scores, and sums them to produce a total score ranging from 1.5 to 16. The interpretation of the resulting score is straightforward: a score of 7 or less indicates that appendicitis is unlikely, while a score of more than 7 suggests that appendicitis is likely.

The RIPASA score, or Raja Isteri Pengiran Anak Saleha Appendicitis score, is a clinical calculator used for the diagnosis of acute appendicitis. It is applicable to patients presenting with acute abdominal pain where there is a suspicion of appendicitis. The RIPASA score is designed to improve diagnostic accuracy, reduce negative appendectomy rates, and aid in decision-making regarding the need for surgery. It incorporates a range of clinical, laboratory, and demographic factors, including symptoms, signs, and blood test results. There are no specific exclusion criteria for its use, but it may be less accurate in atypical presentations of appendicitis or in patients with other abdominal conditions that mimic appendicitis.

RIPASA score for acute appendicitis