الفهرس 
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Abstract
Background: acute dehydration in pediatric patients is a common and potentially life-threatening condition encountered frequently in both primary care and emergency medicine practice. Unfortunately, individual symptoms and physical exam findings are often unhelpful in discerning the degree of dehydration in the pediatric patient. The combinations of clinical signs and symptoms have generally low sensitivities and specificities. Therefore. there is a need for a noninvasive, rapid, and objective tool that accurately reflects the volume status in children with dehydration.
Purpose: to evaluate the role of bedside ultrasound measurement of collapsibility index of inferior vena cava in relation to clinical evaluation as a useful non invasive tool for the detection of children’s hydration status.
Patients and Methods: this study was conducted on 50 children of both genders admitted at Children’s Hospital at Ain Shams University and 50 apparently healthy children -sex and age matched- were included as a control group.
Results: there was statistically significant difference between cases group and healthy control group as regards MCV level. There was a highly statistically significant difference between mild and moderate dehydration groups, mild and severe dehydration groups and moderate and severe dehydration groups as regards IVC collapsibility index and After calculation of area under curve (AUC), cut off point value of IVC collapsibility index was >41 with sensitivity = 83.33% and specificity = 88%, Positive predictive value (PPV) was 80.60 and negative predictive value (NPV) was 89.8.
Conclusion: bedside ultrasound measurement of collapsibility index of inferior vena cava in relation to clinical evaluation can be considered as a useful non-invasive tool for the detection of children’s hydration status.