Background. India, a significant contributor to global childbirth, faces the challenge of childhood mortality. Despite progress, diarrhoea-induced dehydration remains a pressing concern, contributing to 13 % of child mortality in the country. This study aims to assess the utility of point-of-care ultrasonography in evaluating intravascular volume status in paediatric patients, especially those experiencing dehydration. The lack of normative data on inferior vena cava (IVC) diameter in Indian children prompted conducting this study. Materials and methods. It was a prospective observational study performed at Vinayaka Mission's Kirupananda Variyar Medical College in Salem, Tamil Nadu for 1 year. Data from 200 outpatient children aged 2 to 12 were analysed to establish normative IVC diameter and explore correlations with age, gender, and somatic characteristics. Statistical analyses employed SPSS software, presenting quantitative data as mean and standard deviations and qualitative data as percentages. Results. This study enrolled 52 % females and 48 % males. Results showed the mean IVC volume of 8.650 ± 2.325 mm with a minimum of 5 mm to a maximum of 15 mm. Correlation tests assessed associations between variables, setting significance at p < 0.05. Results highlighted IVC dimensions in Indian children, demonstrating associations between age, height, weight, and abdominal girth with IVC diameter. Conclusions. This study provides a normative data for IVC diameter in Indian children, elucidating its associations with age and somatic characteristics. The findings underscore the importance of IVC measurements when evaluating dehydration levels, highlighting the necessity for further research with larger sample size thereby enhancing clinical precision and applicability. © 2024 Elsevier B.V., All rights reserved.