Introduction:The FAST protocol (Focused Assessment with Sonography for trauma), is called a focused assessment protocol with ultrasound for trauma, it is recommended by the international panel of advanced life support for trauma (ATLS) in the resuscitation of patients with open trauma and/or closed chest or abdomen, the patient's stability is not a limitation of said protocol, and it can be applied to both hemodynamically stable and unstable patients, applicable to thoracoabdominal trauma. Goal: to identify the sonographic criteria in the evaluation focused with ultrasound in thoracoabdominal trauma, through the analysis of scientific articles on evidence-based medicine, for timely care in daily medical practice. Methodology: Descriptive study, based on a systematic bibliographic review, the analysis of scientific articles from various evidencebased medicine journals with a high impact on health (Pubmed, Scopus, Cochrane, Springer, etc.) was carried out; of the last 5 years in progress, and literature of surgery and trauma, with the processing of scientific information in Mendeley. Conclusion: Because the effectiveness of the FAST protocol is operator dependent, it is important that all health personnel in the prehospital and hospital settings, directly related to the emergency service, know and adequately identify the sonographic patterns or criteria in the evaluation focused on ultrasound. for thoracoabdominal trauma, in order to obtain better sensitivity and specificity of the radiological study and make appropriate and early decisions to reduce patient morbidity and mortality.