Background: Central Venous Pressure (CVP) has been used for fluid resuscitation and to check intravascular volume status. A rapid bedside sonographic examination can be instrumental in guiding management of trauma and critically ill patients. This study evaluated the Ultrasonographic (USG) measurement of Inferior Vena Cava (IVC) diameter and caval index to identify intravascular volume status and its correlation with CVP. We also investigated the association of caval index of ≥ 50% and CVP ≤ 8 mm Hg. Aims: This study was designed to evaluate Ultrasonographic (USG) measurement of Inferior Vena Cava (IVC) diameter and caval index could identify intravascular volume status and its correlation with CVP. Also, investigating the association of caval index of ≥ 50% and CVP ≤ 8 mm Hg. Materials and Methods: A hundred patients aged 18 years and above were enrolled in this prospective, observational study. IVC inspiratory and expiratory diameters were measured by USG. The correlation of CVP and caval index was calculated. Participants were stratified by their CVP ≤ 8 mm Hg and > 8 mm Hg. Results: In 100 participants of the study, 68 had a CVP ≤ 8 mm Hg with caval index > 50%. The efficacy of caval index predicting the low CVP (CVP ≤ 8) between the Two Groups was statistically significant. The caval index ≥ 50% predicting a CVP ≤ 8 mm Hg had sensitivity, specificity, positive and negative predictive value of 97%, 96%, 99% and 93% respectively. Conclusions: Bedside USG measurement of caval index greater than or equal to 50% is strongly associated with a low CVP and caval index could be a useful tool to determine CVP.