Acute appendicitis (AA) is a disease of younger age, but it occurs in 1 out of 500-2000 pregnancies. The current treatment of choice for AA in pregnancy is surgical. Even with standard clinical examination, serum inflammatory markers, and transabdominal ultrasound, the decision on surgical treatment of acute appendicitis (AA) and the rate of negative appendectomy in pregnancy are still unsatisfactory. There are several scoring systems (Alvarado, Tzanakis) that help making decision on operating more easier, however their specificity is either high with low sensitivity, or the other way around. In addition, all scores are based on adult non-pregnant population. We are making an observational study to develop a scoring system that would include ultrasonic imaging with clinical-biochemical parameters while not compromising sensitivity and specificity.

The study includes extraction of medical data for pregnant women, age 18 years or older, admitted to the University Hospital Centre Zagreb, Zagreb, Croatia, with the suspicion of AA, from January 2010 to December 2020. The aim of this study is to develop a scoring system that would include ultrasonic imaging with clinical-biochemical parameters while not compromising sensitivity and specificity.

Inclusion Criteria:

• pregnant women, age 18 years or older, admitted to the University Hospital Centre Zagreb, Zagreb, Croatia, with the suspicion of acute appendicitis, from January 2010 to December 2020.

Exclusion Criteria:

• non-pregnant patients
• pregnant patients younger than 18 years
• diagnosis made with CT or MRI
• pregnant patients with the acute abdomen (intraoperative diffuse peritonitis) from acute appendicitis

Patients (pregnant women, age 18 years or older, admitted to the University Hospital Centre Zagreb, Zagreb, Croatia, with the suspicion of acute appendicitis, from January 2010 to December 2020.) demographics, symptoms, laboratory findings, diagnostic and treatment modalities were extracted from electronic medical records.