INTRODUCTION: In the face of sudden events with many victims various types of medical segregation systems were created. Their aim is to set the treatment and transport priority of patients by giving them appropriate urgency codes considering their general condition and vital parameters. The study is aimed at comparing the effectiveness of selected medical segregation systems. MATERIAL AND METHODS: The research tool consisted of one hundred virtual patients whose condition was categorized according to the START system (Simple Triage and Rapid Treatment) for four urgency codes - 25 persons for each of four categories. Then they were segregated by assigning the wounded to individual urgency codes using the SIEVE and CAREFLIGHT systems. To the statistical analysis was used the Mann-Whitney U test. All results were considered significant at p <0.05. RESULTS: Among 100 patients using the SIEVE system 25 were identified in green and black code 27 in yellow code and 23 in red code. Using the CAREFLIGHT system 25 patients were shown in green and black code 31 in yellow code and 19 in red code. There were no differences between segregation systems between green and black code patients (Code 3 and 4: START = 25 vs. SIEVE = 25 vs. CAREFLIGHT = 25). In contrast the yellow code showed differences in the SIEVE system compared to the control group - START system (p = 0.005 Code 2: START = 25 vs. SIEVE = 18) which however was not demonstrated in relation to CAREFLIGHT (Code 2: START = 25 vs. CAREFLIGHT = 25). In the red code showed differences between the control group and the SIEVE system (p = 0.001 Code 1: START = 25 vs SIEVE = 16) and the CAREFLIGHT system (p = 0.010 Code 1: START = 25 vs. CAREFLIGHT = 19). CONCLUSIONS: The effectiveness of selected medical segregation systems (START SIEVE and CAREFLIGHT) is significantly different among patients in yellow and red code. Taking into account the highest urgency code the most sensitive selection is shown by the START system and the least sensitive - CAREFLIGHT.