Depending on which software you used for segmentation, I would determine the workflow for the volume measurement. 3D slicer should have a volume measurement tool (found instructions here: https://www.youtube.com/watch?v=eHXaw5N5GN4).
In our recent paper, we measured the segmented volume with AMIRA and we chose the volume tool (https://www.frontiersin.org/articles/10.3389/fphar.2023.1062379/full).