Background and Study Aim. Falling is an increasingly frequent problem. Assessment of the ability to control the body parts that are most susceptible to injury during a fall is the primary goal of prevention of fall-related injuries. The susceptibility test of the body injuries during a fall (STBIDF) is of note. To date, investigations of the STBIDF have been limited to validity assessment. Aim. Verify the reliability and objectivity of the STBIDF test. Material and Methods. Thirty-five female physiotherapy students participated in this study voluntarily. The sample was selected from 45 males and females undertaking their first-degree studies during the fifth semester of 2017–2018 at Podhale State College of Applied Sciences (PSCAS) in Nowy Targ, Poland. The STBIDF questionnaire was applied. Each student was recorded during STBIDF test performance. The STBIDF reliability assessment was performed using the test-retest method. The STBIDF objectivity assessment was performed using the Delphi method, with a panel consisting of three experts. Results. A significant correlation (rs = 0.865, p < 0.001) between the IndexSBIDF scores for the test and retest was observed. The Wilcoxon signed-rank test result did not reveal any significant differences between the test and retest. Conclusions. The STBDIF is characterized by reliability and objectivity; therefore, it is a good tool for analysis of the susceptibility to injury of the body parts most exposed during falls in people from different risk groups. This non-apparatus test is a reliable and easy to use tool, available for experts dealing with falls and their consequences, and preventive approaches. It can also be used in medical, pedagogical, and athletic environments.