Bedside ultrasound, as performed by the intensivist, is gaining in popularity and has become a powerful tool to understand the physiological state of the critically ill patient and to decrease procedural risks. This review assesses clinical applications of bedside ultrasound in the pediatric intensive care unit. A literature review was conducted to identify English language studies in Pubmed as of June, 2010, using combinations of the following search terms: 'pediatric,' 'ultrasound,' 'critical care,' and 'intensive care.' Examination of reference lists of these studies yielded additional studies. Studies were reviewed by both authors. Intensive care unit, emergency department, or operating rooms, as relevant to application of bedside ultrasound in the pediatric intensive care unit. Pediatric patients (age 0-18 yrs) with adult patients (>18 yrs) in relevant studies utilizing bedside ultrasound by the treating clinician. Bedside ultrasound by treating clinician. Variable, per individual studies. MAIN RESULTS/CONCLUSIONS: Bedside ultrasound, as practiced by the pediatric intensivist, has the potential to improve pediatric critical care medicine, but data supporting its use is limited. Further studies are needed to explore applications, with specific emphasis on the training and experience of ultrasound operators. There is a need for a standardized educational curriculum, and questions remain as to the optimal mode of education and quality assurance of ultrasound operators.